Datetime string reformatting
Hi, ALL,
I am trying to comprehend what is required to get a successful processing. ;-)
My script receives a data from the csv file. In this csv file there is
a datetime field.
This datetime field is formatted as follows: %m/%d/%Y
%H:%M:%S.{milliseconds}. I'm reading this field into the string with
this format.
The trouble comes from the fact that I need to insert this value into
mySQL. Doing it directly gives me an error: Incorrect formatting.
After a bit of googling and trial I found out that mySQL is looking
for the format of '%Y/%m/%d %H:%M:%S.{milliseconds}.
There is a mySQL function which transfers the data into the proper
format: STR_TO_DATE(), but I can't obviously call it since it is not
known to Python.
Now obviously there should be a possibility to reformat this string.
I guess I can try to do:
mydate = date(mydate_from_csv)
text = mydate.format()
but this feels like an ugly hack.
Is there a better alternative?
Thank you.
--
https://mail.python.org/mailman/listinfo/python-list
Re: Datetime string reformatting
On 22/12/2013 10:58, Igor Korot wrote:
Hi, ALL,
I am trying to comprehend what is required to get a successful processing. ;-)
My script receives a data from the csv file. In this csv file there is
a datetime field.
This datetime field is formatted as follows: %m/%d/%Y
%H:%M:%S.{milliseconds}. I'm reading this field into the string with
this format.
The trouble comes from the fact that I need to insert this value into
mySQL. Doing it directly gives me an error: Incorrect formatting.
After a bit of googling and trial I found out that mySQL is looking
for the format of '%Y/%m/%d %H:%M:%S.{milliseconds}.
There is a mySQL function which transfers the data into the proper
format: STR_TO_DATE(), but I can't obviously call it since it is not
known to Python.
Now obviously there should be a possibility to reformat this string.
I guess I can try to do:
mydate = date(mydate_from_csv)
text = mydate.format()
but this feels like an ugly hack.
Is there a better alternative?
Thank you.
Round trip the data using these
http://docs.python.org/3/library/datetime.html#strftime-strptime-behavior or
use string slicing and dicing.
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
--
https://mail.python.org/mailman/listinfo/python-list
unicode to human readable format
Hi, i'm looking for solution the unicode string translation to the more readable format. I've got string like s=s=[u'\u0105\u017c\u0119\u0142\u0144'] and have no idea how to change to the human readable format. please help! regards, tomasz -- https://mail.python.org/mailman/listinfo/python-list
Re: unicode to human readable format
On Sun, Dec 22, 2013 at 1:24 PM, tomasz.kaczo...@gmail.com wrote: Hi, i'm looking for solution the unicode string translation to the more readable format. I've got string like s=s=[u'\u0105\u017c\u0119\u0142\u0144'] and have no idea how to change to the human readable format. please help! regards, tomasz -- https://mail.python.org/mailman/listinfo/python-list While printing the string, instead of the list/seeing the list’s repr, Python shows a nice human-friendly representation. s=[u'\u0105\u017c\u0119\u0142\u0144'] s [u'\u0105\u017c\u0119\u0142\u0144'] s[0] u'\u0105\u017c\u0119\u0142\u0144' print s [u'\u0105\u017c\u0119\u0142\u0144'] print s[0] ążęłń However, that is only the case with Python 2, as Python 3 has a human-friendly representation in the repr, too: s=[u'\u0105\u017c\u0119\u0142\u0144'] s ['ążęłń'] -- Chris “Kwpolska” Warrick http://kwpolska.tk PGP: 5EAAEA16 stop html mail | always bottom-post | only UTF-8 makes sense -- https://mail.python.org/mailman/listinfo/python-list
Re: unicode to human readable format
tomasz.kaczo...@gmail.com wrote: Hi, i'm looking for solution the unicode string translation to the more readable format. I've got string like s=s=[u'\u0105\u017c\u0119\u0142\u0144'] and have no idea how to change to the human readable format. please help! No, you have a list of strings: list_of_strings = [u'\u0105\u017c\u0119\u0142\u0144'] print list_of_strings [u'\u0105\u017c\u0119\u0142\u0144'] When a list is printed the individual items are converted to strings with repr() to avoid ambiguous output e. g. for strings with embeded commas. If you want human readable strings print them individually instead of the whole list at once: for string in list_of_strings: ... print string ... ążęłń -- https://mail.python.org/mailman/listinfo/python-list
vnc-problem with idle running as sudo on raspberry pi
I found the following solution to use idle on the raspberry pi
as sudoer (which is necessary or at least comfortable when programming the
GPIO)
1. Open a terminal
2. type cd ~/Desktop
3. type touch idle_as_root
4. type nano idle_as_root
5. type in sudo idle
6. exit nano
7. type in sudo chmod +x idle_as_root
8. Close terminal
9. Double click on the idle_as_root program on your desktop
This all works fine as long as I use X, however
I also want to use it via vnc
For vnc I did the following:
Installed script tightvncserver on the RPiwith the following contents:
#!/bin/bash
# /etc/init.d/tightvncserver
VNCUSER='pi'
case $1 in
start)
#su $VNCUSER -c '/usr/bin/tightvncserver :1'
su -l $VNCUSER -c '/usr/bin/tightvncserver :1'
echo Starting TightVNC server for $VNCUSER
;;
stop)
pkill Xtightvnc
echo Tightvncserver stopped
;;
*)
echo Usage: /etc/init.d/tightvncserver {start|stop}
exit 1
;;
esac
exit 0
sudo chmod 755 /etc/init.d/tightvncserver
sudo update-rc.d tightvncserver defaults
when starting the script manually like this
sudo /etc/init.d/tightvncserver start
everything works as expected i.e. I can click on the idle_as_root-icon and
it works as expected.
If however I reboot the system, the service does start and I do see the
rpi-desktop but clicking the idle_as_root-icon doesn't work. Manually
trying to start it as follows show an error:
pi@raspberrypi ~ $ sudo idle
Client is not authorized to connect to ServerTraceback (most recent call
last):
File /usr/bin/idle, line 5, in module
main()
File /usr/lib/python2.7/idlelib/PyShell.py, line 1427, in main
root = Tk(className=Idle)
File /usr/lib/python2.7/lib-tk/Tkinter.py, line 1712, in __init__
self.tk = _tkinter.create(screenName, baseName, className,
interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display :1.0
Does someone here have a solution for this problem?
thanks in advance
jean
--
https://mail.python.org/mailman/listinfo/python-list
Re: vnc-problem with idle running as sudo on raspberry pi
Op zondag 22 december 2013 14:02:47 UTC+1 schreef Jean Dubois:
I found the following solution to use idle on the raspberry pi
as sudoer (which is necessary or at least comfortable when programming the
GPIO)
1. Open a terminal
2. type cd ~/Desktop
3. type touch idle_as_root
4. type nano idle_as_root
5. type in sudo idle
6. exit nano
7. type in sudo chmod +x idle_as_root
8. Close terminal
9. Double click on the idle_as_root program on your desktop
This all works fine as long as I use X, however
I also want to use it via vnc
For vnc I did the following:
Installed script tightvncserver on the RPiwith the following contents:
#!/bin/bash
# /etc/init.d/tightvncserver
VNCUSER='pi'
case $1 in
start)
#su $VNCUSER -c '/usr/bin/tightvncserver :1'
su -l $VNCUSER -c '/usr/bin/tightvncserver :1'
echo Starting TightVNC server for $VNCUSER
;;
stop)
pkill Xtightvnc
echo Tightvncserver stopped
;;
*)
echo Usage: /etc/init.d/tightvncserver {start|stop}
exit 1
;;
esac
exit 0
sudo chmod 755 /etc/init.d/tightvncserver
sudo update-rc.d tightvncserver defaults
when starting the script manually like this
sudo /etc/init.d/tightvncserver start
everything works as expected i.e. I can click on the idle_as_root-icon and
it works as expected.
I was wrong writing idle_as_root worked this way. As a matter of fact,
this method also does not work as expected, as can be seen from this
message:
X11 connection rejected because of wrong authentication.
New 'X' desktop is raspberrypi:1
Starting applications specified in /home/pi/.vnc/xstartup
Log file is /home/pi/.vnc/raspberrypi:1.log
Starting TightVNC server for pi
If however I reboot the system, the service does start and I do see the
rpi-desktop but clicking the idle_as_root-icon doesn't work. Manually
trying to start it as follows show an error:
pi@raspberrypi ~ $ sudo idle
Client is not authorized to connect to ServerTraceback (most recent call
last):
File /usr/bin/idle, line 5, in module
main()
File /usr/lib/python2.7/idlelib/PyShell.py, line 1427, in main
root = Tk(className=Idle)
File /usr/lib/python2.7/lib-tk/Tkinter.py, line 1712, in __init__
self.tk = _tkinter.create(screenName, baseName, className,
interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display :1.0
--
https://mail.python.org/mailman/listinfo/python-list
Re: [OT] vnc-problem with idle running as sudo on raspberry pi
On 12/22/2013 06:27 AM, Jean Dubois wrote: I was wrong writing idle_as_root worked this way. As a matter of fact, this method also does not work as expected, as can be seen from this message: X11 connection rejected because of wrong authentication. New 'X' desktop is raspberrypi:1 Starting applications specified in /home/pi/.vnc/xstartup Log file is /home/pi/.vnc/raspberrypi:1.log Starting TightVNC server for pi In future, I suspect you'll need to take questions like this that don't really have anything to do with Python to a Raspberry Pi forum or e-mail list. Or a general Linux list. Short answer: Edit /etc/sudoers and add this line somewhere in it (probably near other lines that look similar): Defaults env_keep += DISPLAY XAUTHORITY If that doesn't work, then you'll have to talk to folks running the Rasbian on their Pi. Sometimes XAUTHORITY isn't set. -- https://mail.python.org/mailman/listinfo/python-list
Re: Datetime string reformatting
On 22.12.2013 11:58, Igor Korot wrote:
My script receives a data from the csv file. In this csv file there is
a datetime field.
This datetime field is formatted as follows: %m/%d/%Y
%H:%M:%S.{milliseconds}. I'm reading this field into the string with
this format.
The trouble comes from the fact that I need to insert this value into
mySQL. Doing it directly gives me an error: Incorrect formatting.
After a bit of googling and trial I found out that mySQL is looking
for the format of '%Y/%m/%d %H:%M:%S.{milliseconds}.
There is a mySQL function which transfers the data into the proper
format: STR_TO_DATE(), but I can't obviously call it since it is not
known to Python.
You don't want to call STR_TO_DATE() from Python but use it inside the
SQL statement.
So instead of doing the conversion in Python as Mark suggested, you
could do something like
sql_stmt = INSERT ...
VALUES (..., STR_TO_DATE(%s, %m/%d/%Y %H:%M:%S.{%f}),
...)
cursor.execute(sql_stmt, (..., mydate_from_csv, ...))
(BTW: Do you mean microseconds instead of milliseconds? And are the
milliseconds really inside curly braces?)
Bye, Andreas
--
https://mail.python.org/mailman/listinfo/python-list
BLANK PAGE when i try Filtering Adsense with abpy
I know is my fault i'm no good programmer, I'm a begginer that's why i need
your help.
I have a python 3.3 project to be finished. I did what i could there is not
much help on google about this topic.
The project is to load a webpage from any website and filter the ads.
I'm using ABPY library to filter, here is the link:
https://github.com/atereshkin/abpy - needs to be converted in python 3.x it is
on 2.x
easylist.txt link: https://easylist-downloads.adblockplus.org/easylist.txt
When I use my code it just displays nothing
My code:
#!/usr/local/bin/python3.1
import cgitb;cgitb.enable()
import urllib.request
response = urllib.request.build_opener()
response.addheaders = [('User-agent', 'Mozilla/5.0')]
response = urllib.request.urlopen(www.youtube.com;)
html = response.read()
from abpy import Filter
with open(easylist.txt) as f:
f = Filter(file('easylist.txt'))
f.match(html)
print(Content-type: text/html)
print()
print (html)
--
https://mail.python.org/mailman/listinfo/python-list
Re: BLANK PAGE when i try Filtering Adsense with abpy
On Mon, Dec 23, 2013 at 4:20 AM, em rexhepi em.rexh...@gmail.com wrote: I have a python 3.3 project to be finished. ... My code: #!/usr/local/bin/python3.1 Your shebang says 3.1, are you sure that's correct? Maybe it's not finding the right interpreter. If this is running as CGI, which it seems to be, check your server error logs. It's quite possible you're getting back a blank page because something's bombing, in which case - if you're lucky - there'll be a full exception traceback in the log. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Getting updates and restarting a long running url request.
I am using biopython's NCBIWWW.qblast which sends a request to the ncbi website and waits for a result. The relevant code can be found at the link below starting at about 151. Basically it is a while loop waiting for the blast query. http://biopython.org/DIST/docs/api/Bio.Blast.NCBIWWW-pysrc.html My problem; I am submitting about 75 request (one at a time and with delays) and they can each take minutes to complete. I think sometimes the request/response/query fails which results in me needing to restart the process. I am looking for suggestion on how to monitor and restart the process if I think it has failed. I am using the following code to submit the query/ def get_BLAST(taxid, queryseq, args=None): ''' Input taxid to BLAST queryseq against ''' e_query = txid + taxid + [ORGN] #, other_advanced='-G 4 -E 1' blast_result = NCBIWWW.qblast(blastn, nt, queryseq, megablast=True, entrez_query=e_query, word_size='11', other_advanced='-G 5 -E 2') return NCBIXML.read(blast_result) Vincent Davis -- https://mail.python.org/mailman/listinfo/python-list
Re: BLANK PAGE when i try Filtering Adsense with abpy
On 12/22/2013 10:20 AM, em rexhepi wrote:
When I use my code it just displays nothing
My code:
#!/usr/local/bin/python3.1
import cgitb;cgitb.enable()
import urllib.request
response = urllib.request.build_opener()
response.addheaders = [('User-agent', 'Mozilla/5.0')]
response = urllib.request.urlopen(www.youtube.com;)
html = response.read()
from abpy import Filter
with open(easylist.txt) as f:
f = Filter(file('easylist.txt'))
f.match(html)
What happens when you comment out the above four lines? Does the web
page print without the filtering? Just as a sanity check. My hunch is
that html has no data in it.
Also what is f.match(html) supposed to return? Is it supposed to
mutate html (seems unlikely) or does it return something? Looking at the
source code, match() does not return anything, but prints to stdout,
which is weird, but at least that tells us that it doesn't actually
change the html object.
print(Content-type: text/html)
print()
print (html)
I'm not sure you're doing this right. adpy seems a bit goofy, but since
f.match() does not appear to change html at all, you should get the same
html out that urllib grabbed. So if you're not getting any output, that
means you're not getting the original html somehow. Also if f.match()
is doing its thing, I don't think you want to print out html after the
command, because f.match itself is printing to stdout itself.
Have you looked over the adpy source code? I haven't bothered to run
it, but a glance through the code would seem to indicate that it doesn't
actually do the filtering at all, but rather just prints out the rules
that the html code you provide would match. I bet you could modify it
to do filtering though. Maybe add a method that uses rule.sub to
replace the bad text with an empty string.
--
https://mail.python.org/mailman/listinfo/python-list
Re: BLANK PAGE when i try Filtering Adsense with abpy
On 22/12/2013 17:20, em rexhepi wrote:
I know is my fault i'm no good programmer, I'm a begginer that's why i need
your help.
I have a python 3.3 project to be finished. I did what i could there is not
much help on google about this topic.
The project is to load a webpage from any website and filter the ads.
I'm using ABPY library to filter, here is the link:
https://github.com/atereshkin/abpy - needs to be converted in python 3.x it is
on 2.x
easylist.txt link: https://easylist-downloads.adblockplus.org/easylist.txt
When I use my code it just displays nothing
My code:
#!/usr/local/bin/python3.1
import cgitb;cgitb.enable()
import urllib.request
response = urllib.request.build_opener()
response.addheaders = [('User-agent', 'Mozilla/5.0')]
response = urllib.request.urlopen(www.youtube.com;)
html = response.read()
from abpy import Filter
with open(easylist.txt) as f:
f = Filter(file('easylist.txt'))
f.match(html)
Whats the above meant to be doing? You've opened easylist.txt as f and
then reassigned f, passing easylist.txt to file which doesn't exist in
Python 3.
print(Content-type: text/html)
print()
print (html)
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
--
https://mail.python.org/mailman/listinfo/python-list
Error while building Python doc
Hi, I am trying to build Python documents as listed here http://docs.python.org/devguide/documenting.html#building-the-documentation make -C Doc html Error message: Checked out revision 89010. mkdir -p build/html build/doctrees python tools/sphinx-build.py -b html -d build/doctrees -D latex_paper_size= . build/html Traceback (most recent call last): File tools/sphinx-build.py, line 27, in module from sphinx import main ImportError: No module named sphinx make: *** [build] Error 1 make: Leaving directory `Python-git/cpythonL-doc/Doc' Sphinx is located inside the directory: Doc/tools. Do I need to change how I import (the path may be). -- Thanks Gudge -- https://mail.python.org/mailman/listinfo/python-list
cascading python executions only if return code is 0
hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0:if b() == 0:c() Thanks for your input. frank -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
In article mailman.4500.1387739297.18130.python-l...@python.org, Frank Cui y...@outlook.com wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0:if b() == 0:c() Thanks for your input. frank Yup! Just do: a() or b() or c() The or operation has what's known as short-circuit semantics. That means, if the first operand is true, it doesn't evaluate the second operand. Just make sure that a(), b(), and c() all return something which is true if they succeed and false otherwise. -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
Frank Cui wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0:if b() == 0:c() Thanks for your input. frank funcs = a, b, c # option 1 for f in funcs: if f(): break # option 2 any(f() for f in funcs) -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On 12/22/2013 10:37 AM, Frank Cui wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0: if b() == 0: c() Thanks for your input. frank This would seem to do the same as your code and could easily be extended to your bunch of things: exes = [a, b, c] for e in exes: if e() != 0: break -- https://mail.python.org/mailman/listinfo/python-list
RE: cascading python executions only if return code is 0
Thanks, this looks beautiful To: python-list@python.org From: __pete...@web.de Subject: Re: cascading python executions only if return code is 0 Date: Sun, 22 Dec 2013 20:26:15 +0100 Frank Cui wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0:if b() == 0:c() Thanks for your input. frank funcs = a, b, c # option 1 for f in funcs: if f(): break # option 2 any(f() for f in funcs) -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On 22/12/2013 19:17, Roy Smith wrote: In article mailman.4500.1387739297.18130.python-l...@python.org, Frank Cui y...@outlook.com wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0:if b() == 0:c() Thanks for your input. frank Yup! Just do: a() or b() or c() The or operation has what's known as short-circuit semantics. That means, if the first operand is true, it doesn't evaluate the second operand. Just make sure that a(), b(), and c() all return something which is true if they succeed and false otherwise. Really? :) -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
RE: cascading python executions only if return code is 0
sorry, but what if I need to have different parameters in these functions ? To: python-list@python.org From: breamore...@yahoo.co.uk Subject: Re: cascading python executions only if return code is 0 Date: Sun, 22 Dec 2013 19:31:21 + On 22/12/2013 19:17, Roy Smith wrote: In article mailman.4500.1387739297.18130.python-l...@python.org, Frank Cui y...@outlook.com wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0:if b() == 0:c() Thanks for your input. frank Yup! Just do: a() or b() or c() The or operation has what's known as short-circuit semantics. That means, if the first operand is true, it doesn't evaluate the second operand. Just make sure that a(), b(), and c() all return something which is true if they succeed and false otherwise. Really? :) -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On 12/22/13 2:10 PM, Frank Cui wrote: sorry, but what if I need to have different parameters in these functions ? Frank, welcome to the group. Common convention is to put your response below the exiting message, so that the conversation continues down the page. (See my answer below... :) To: python-list@python.org From: breamore...@yahoo.co.uk Subject: Re: cascading python executions only if return code is 0 Date: Sun, 22 Dec 2013 19:31:21 + On 22/12/2013 19:17, Roy Smith wrote: In article mailman.4500.1387739297.18130.python-l...@python.org, Frank Cui y...@outlook.com wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0: if b() == 0: c() Thanks for your input. frank Yup! Just do: a() or b() or c() The or operation has what's known as short-circuit semantics. That means, if the first operand is true, it doesn't evaluate the second operand. Just make sure that a(), b(), and c() all return something which is true if they succeed and false otherwise. Really? :) -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list The most Python-natural way to deal with your problem would be to have these functions not return status codes at all. Instead, have them raise an exception if something goes wrong. Then you can invoke them most naturally: a() b() c() Execution will continue as long as no exceptions are raised. If you need to deal with the failure case also, then: try: a() b() c() except Exception as e: # do something here Depending on how you want to deal with failures, you'd probably use your own subclass of Exception, but this is the general idea. Return codes can be awkward, especially in Python which has exception integrated so fully into the language, library, and culture. -- Ned Batchelder, http://nedbatchelder.com -- https://mail.python.org/mailman/listinfo/python-list
RE: cascading python executions only if return code is 0
To: python-list@python.org From: n...@nedbatchelder.com Subject: Re: cascading python executions only if return code is 0 Date: Sun, 22 Dec 2013 14:49:43 -0500 On 12/22/13 2:10 PM, Frank Cui wrote: sorry, but what if I need to have different parameters in these functions ? Frank, welcome to the group. Common convention is to put your response below the exiting message, so that the conversation continues down the page. (See my answer below... :) To: python-list@python.org From: breamore...@yahoo.co.uk Subject: Re: cascading python executions only if return code is 0 Date: Sun, 22 Dec 2013 19:31:21 + On 22/12/2013 19:17, Roy Smith wrote: In article mailman.4500.1387739297.18130.python-l...@python.org, Frank Cui y...@outlook.com wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0: if b() == 0: c() Thanks for your input. frank Yup! Just do: a() or b() or c() The or operation has what's known as short-circuit semantics. That means, if the first operand is true, it doesn't evaluate the second operand. Just make sure that a(), b(), and c() all return something which is true if they succeed and false otherwise. Really? :) -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list The most Python-natural way to deal with your problem would be to have these functions not return status codes at all. Instead, have them raise an exception if something goes wrong. Then you can invoke them most naturally: a() b() c() Execution will continue as long as no exceptions are raised. If you need to deal with the failure case also, then: try: a() b() c() except Exception as e: # do something here Depending on how you want to deal with failures, you'd probably use your own subclass of Exception, but this is the general idea. Return codes can be awkward, especially in Python which has exception integrated so fully into the language, library, and culture. -- Ned Batchelder, http://nedbatchelder.com -- https://mail.python.org/mailman/listinfo/python-list Thanks for informing the rules. -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
In article mailman.4504.1387740695.18130.python-l...@python.org, Mark Lawrence breamore...@yahoo.co.uk wrote: On 22/12/2013 19:17, Roy Smith wrote: In article mailman.4500.1387739297.18130.python-l...@python.org, Frank Cui y...@outlook.com wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0:if b() == 0:c() Thanks for your input. frank Yup! Just do: a() or b() or c() The or operation has what's known as short-circuit semantics. That means, if the first operand is true, it doesn't evaluate the second operand. Just make sure that a(), b(), and c() all return something which is true if they succeed and false otherwise. Really? :) I believe what Mark is so elegantly trying to say is, Roy is a dufus and got that backwards. You need to return something which is false to make the next one in the chain get executed. $ cat or.py def a(): print a return 0 def b(): print b return 1 def c(): print c return 0 a() or b() or c() $ python or.py a b -- https://mail.python.org/mailman/listinfo/python-list
Re: BLANK PAGE when i try Filtering Adsense with abpy
On 22/12/2013 18:08, Michael Torrie wrote:
On 12/22/2013 10:20 AM, em rexhepi wrote:
When I use my code it just displays nothing
My code:
#!/usr/local/bin/python3.1
import cgitb;cgitb.enable()
import urllib.request
response = urllib.request.build_opener()
response.addheaders = [('User-agent', 'Mozilla/5.0')]
response = urllib.request.urlopen(www.youtube.com;)
html = response.read()
from abpy import Filter
with open(easylist.txt) as f:
f = Filter(file('easylist.txt'))
f.match(html)
What happens when you comment out the above four lines? Does the web
page print without the filtering? Just as a sanity check. My hunch is
that html has no data in it.
Also what is f.match(html) supposed to return? Is it supposed to
mutate html (seems unlikely) or does it return something? Looking at the
source code, match() does not return anything, but prints to stdout,
which is weird, but at least that tells us that it doesn't actually
change the html object.
print(Content-type: text/html)
print()
print (html)
I'm not sure you're doing this right. adpy seems a bit goofy, but since
f.match() does not appear to change html at all, you should get the same
html out that urllib grabbed. So if you're not getting any output, that
means you're not getting the original html somehow. Also if f.match()
is doing its thing, I don't think you want to print out html after the
command, because f.match itself is printing to stdout itself.
Have you looked over the adpy source code? I haven't bothered to run
it, but a glance through the code would seem to indicate that it doesn't
actually do the filtering at all, but rather just prints out the rules
that the html code you provide would match. I bet you could modify it
to do filtering though. Maybe add a method that uses rule.sub to
replace the bad text with an empty string.
The urlopen call also contains a stray semicolon.
--
https://mail.python.org/mailman/listinfo/python-list
Re: Error while building Python doc
On 12/22/2013 1:53 PM, shankha wrote: Hi, I am trying to build Python documents as listed here http://docs.python.org/devguide/documenting.html#building-the-documentation make -C Doc html Error message: Checked out revision 89010. mkdir -p build/html build/doctrees python tools/sphinx-build.py -b html -d build/doctrees -D latex_paper_size= . build/html Traceback (most recent call last): File tools/sphinx-build.py, line 27, in module from sphinx import main ImportError: No module named sphinx make: *** [build] Error 1 make: Leaving directory `Python-git/cpythonL-doc/Doc' Sphinx is located inside the directory: Doc/tools. Based on my Windows tree, that should be Doc/tools/sphinx/, along with docutils, jinja, and pygments directories. To be a module, sphinx must contain __init__.py, along with other files. Do I need to change how I import (the path may be). Did you run make -C Doc checkout first? (I do not know what the -C does, as I just do make checkout and occasionally make update in Doc on Windows, which run Doc/make.bat. -- Terry Jan Reedy -- https://mail.python.org/mailman/listinfo/python-list
Re: BLANK PAGE when i try Filtering Adsense with abpy
On 12/22/2013 12:20 PM, em rexhepi wrote:
I know is my fault i'm no good programmer, I'm a begginer that's why i need
your help.
I have a python 3.3 project to be finished. I did what i could there is not
much help on google about this topic.
The project is to load a webpage from any website and filter the ads.
I'm using ABPY library to filter, here is the link:
https://github.com/atereshkin/abpy - needs to be converted in python 3.x it is
on 2.x
easylist.txt link: https://easylist-downloads.adblockplus.org/easylist.txt
When I use my code it just displays nothing
My code:
#!/usr/local/bin/python3.1
Please update your Python 3 if you are not in a straightjacket
preventing you from doing so.
import cgitb;cgitb.enable()
I suggest commenting this out and running normally in a console or Idle
so you are guaranteed to see output, including error tracebacks. Only
use cgi when this runs successfully in normal mode.
import urllib.request
response = urllib.request.build_opener()
response.addheaders = [('User-agent', 'Mozilla/5.0')]
response = urllib.request.urlopen(www.youtube.com;)
The ; is a SyntaxError and Python exits. See above.
html = response.read()
from abpy import Filter
with open(easylist.txt) as f:
f = Filter(file('easylist.txt'))
f.match(html)
print(Content-type: text/html)
print()
print (html)
--
Terry Jan Reedy
--
https://mail.python.org/mailman/listinfo/python-list
Re: Error while building Python doc
Am 22.12.2013 21:59, schrieb Terry Reedy: Did you run make -C Doc checkout first? (I do not know what the -C does, as I just do make checkout and occasionally make update in Doc on Windows, which run Doc/make.bat. -C == change directory make -C Doc html is like cd Doc; make html; cd .. Christian -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On 22Dec2013 15:05, Roy Smith r...@panix.com wrote: In article mailman.4504.1387740695.18130.python-l...@python.org, Mark Lawrence breamore...@yahoo.co.uk wrote: On 22/12/2013 19:17, Roy Smith wrote: In article mailman.4500.1387739297.18130.python-l...@python.org, Frank Cui y...@outlook.com wrote: I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0:if b() == 0:c() Yup! Just do: a() or b() or c() The or operation has what's known as short-circuit semantics. That means, if the first operand is true, it doesn't evaluate the second operand. Just make sure that a(), b(), and c() all return something which is true if they succeed and false otherwise. Really? :) I believe what Mark is so elegantly trying to say is, Roy is a dufus and got that backwards. You need to return something which is false to make the next one in the chain get executed. $ cat or.py def a(): print a return 0 def b(): print b return 1 def c(): print c return 0 a() or b() or c() $ python or.py a b Yeah. Roy's code _depends_ upon the return value being equivalent to False. A better approach would be: a() == 0 and b() == 1 and c() == 0 i.e. to explicitly check each return code against the expected/desired value instead of relying on some flukey coincidental property of the (arbitrary) numeric value returned. Better still is the suggestion elsewhere in the thread to make the functions raise exceptions on error instead of returning a number. Cheers, -- Cameron Simpson c...@zip.com.au -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
In article mailman.4512.1387748397.18130.python-l...@python.org, Cameron Simpson c...@zip.com.au wrote: Roy's code _depends_ upon the return value being equivalent to False. Yes. You view this as a flaw. I view it as a feature :-) A better approach would be: a() == 0 and b() == 1 and c() == 0 i.e. to explicitly check each return code against the expected/desired value instead of relying on some flukey coincidental property of the (arbitrary) numeric value returned. You're assuming it's arbitrary. I'm saying do it that way by design. Better still is the suggestion elsewhere in the thread to make the functions raise exceptions on error instead of returning a number. Possibly. But, I think of exceptions as indicating that something went wrong. There's two possible things the OP was trying to do here: 1) He intends that all of the functions get run, but each one can only get run if all the ones before it succeed. In that case, I agree that the exception pattern makes sense. 2) He intends that each of the functions gets tried, and the first one that can return a value wins. If that's the case, the or chaining seems more natural. -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On 22Dec2013 16:53, Roy Smith r...@panix.com wrote: In article mailman.4512.1387748397.18130.python-l...@python.org, Cameron Simpson c...@zip.com.au wrote: Roy's code _depends_ upon the return value being equivalent to False. Yes. You view this as a flaw. I view it as a feature :-) When I write functions which return a boolean indicating success/failure, I try to make that boolean be true for success. Now, I do take the point that these functions seem to take the unix-exit-code convention that zero is success (leaving the many values of non-zero to indicate flavours of failure as desired, as we have many types of exceptions). Or, possibly, that a non-zero return indicates the number of errors encountered; I do that myself for things like option or file parsing, where I explicitly want to parse of much of a command line (or whatever) as possible before rejecting things; few things annoy me as much as a command that barfs about the first usage error and aborts instead of barfing multiple times and aborting. Unless it is a command that does the same and then fails to recite a usage message after the barf. (Yes, almost every GNU command on the planet: I'm looking at you!) However, in this count-of-errors scenario I tend to try to return a list of errors, not a count. But regardless, I consider code that goes: a() or b() or c() as a test for _success_ of a(), b() and c() in succession to be misleading at best. When I write that above incantation it is a test for failure: try this, or try that, or finally try this other thing. A better approach would be: a() == 0 and b() == 1 and c() == 0 i.e. to explicitly check each return code against the expected/desired value instead of relying on some flukey coincidental property of the (arbitrary) numeric value returned. You're assuming it's arbitrary. I'm saying do it that way by design. The counter example the above is based upon deliberately returned 1 for success from b(), IIRC. Different design. The OP was unclear about his/her design rationale. Better still is the suggestion elsewhere in the thread to make the functions raise exceptions on error instead of returning a number. Possibly. But, I think of exceptions as indicating that something went wrong. I think of failure as something went wrong. Yes, I'll grant there are shades of intent here. There's two possible things the OP was trying to do here: 1) He intends that all of the functions get run, but each one can only get run if all the ones before it succeed. In that case, I agree that the exception pattern makes sense. His cascading if-statement in the OP suggested this to me. 2) He intends that each of the functions gets tried, and the first one that can return a value wins. If that's the case, the or chaining seems more natural. I'm pretty sure that wasn't his intent, again based on my recollection of the OP. But I still dislike a() or b() or c() as a test for chained success; I think it is a bad idiom. Cheers, -- Cameron Simpson c...@zip.com.au I must construct my own System, or be enslaved to another Man's. - William Blake -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Sunday, December 22, 2013 12:37:04 PM UTC-6, Frank Cui wrote: I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0: if b() == 0: c() Hello Frank. I kindly request that you be more specific when asking questions. Both your question and your example code contain too many ambiguities. I'm still not sure what exact outcome you wish to achieve, the only certainty is that you wish to perform a linear execution of N members with later executions being affected by earlier executions. Whether you want executions to proceed on failure or proceed on success is unclear. Here are a few explicit pseudo code examples that would have removed all ambiguities: if fails(a()): if fails(b()): c() if succeeds(a()): if succeeds(b()): c() Or if you prefer a purely OOP approach: a.foo() b.foo() if a.failed: if b.failed: c.foo() a.foo() b.foo() if a.succeeded: if b.succeeded: c.foo() or you could simplify using a logical one liner: if !a() and !b() then c() if a() and b() then c() Of course you could use the all function if all(a(), b()): c() if not any(a(), b()): c() But this all depends whether you're testing for success or testing for failure, and that point is a distant third from my desperate need of understanding your semantics of what values are *true* and what values are *false*. I think (sadly) more time is spent attempting to interpret what an OP is asking rather than attempting to provide a solution to the problem the OP is suffering, and whilst any problem solving adventure is likely to improve our intelligence, fumbling about attempting to decode ambiguities is indeed time that could have been better spent IF ONLY the speaker (or writer) had put a small bit more effort into the question. Look Frank, nobody is perfect, we all need to improve our skills here or there. So don't be offended that my statements are, well,... frank. -- https://mail.python.org/mailman/listinfo/python-list
RE: cascading python executions only if return code is 0
Date: Sun, 22 Dec 2013 14:27:35 -0800 Subject: Re: cascading python executions only if return code is 0 From: rantingrickjohn...@gmail.com To: python-list@python.org On Sunday, December 22, 2013 12:37:04 PM UTC-6, Frank Cui wrote: I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0: if b() == 0: c() Hello Frank. I kindly request that you be more specific when asking questions. Both your question and your example code contain too many ambiguities. I'm still not sure what exact outcome you wish to achieve, the only certainty is that you wish to perform a linear execution of N members with later executions being affected by earlier executions. Whether you want executions to proceed on failure or proceed on success is unclear. Here are a few explicit pseudo code examples that would have removed all ambiguities: if fails(a()): if fails(b()): c() if succeeds(a()): if succeeds(b()): c() Or if you prefer a purely OOP approach: a.foo() b.foo() if a.failed: if b.failed: c.foo() a.foo() b.foo() if a.succeeded: if b.succeeded: c.foo() or you could simplify using a logical one liner: if !a() and !b() then c() if a() and b() then c() Of course you could use the all function if all(a(), b()): c() if not any(a(), b()): c() But this all depends whether you're testing for success or testing for failure, and that point is a distant third from my desperate need of understanding your semantics of what values are *true* and what values are *false*. I think (sadly) more time is spent attempting to interpret what an OP is asking rather than attempting to provide a solution to the problem the OP is suffering, and whilst any problem solving adventure is likely to improve our intelligence, fumbling about attempting to decode ambiguities is indeed time that could have been better spent IF ONLY the speaker (or writer) had put a small bit more effort into the question. Look Frank, nobody is perfect, we all need to improve our skills here or there. So don't be offended that my statements are, well,... frank. -- https://mail.python.org/mailman/listinfo/python-list Hi Rick, Thanks for pointing out. I accept your advice and will try to make the questions clearer and more straightforward to interpretate . I already took the suggestion of using exception-based handling over the return code. As to testing whether the previous function fails or succeeds, this doesn't really matter in the sense that I already mentioned a return code of 0. ThanksFrank -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Mon, Dec 23, 2013 at 9:14 AM, Frank Cui y...@outlook.com wrote: Thanks for pointing out. I accept your advice and will try to make the questions clearer and more straightforward to interpretate . I already took the suggestion of using exception-based handling over the return code. As to testing whether the previous function fails or succeeds, this doesn't really matter in the sense that I already mentioned a return code of 0. Ranting Rick is one of the list's resident trolls. Don't take it amiss that he turned his flamethrowers on you. :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On 22/12/2013 22:51, Chris Angelico wrote: On Mon, Dec 23, 2013 at 9:14 AM, Frank Cui y...@outlook.com wrote: Thanks for pointing out. I accept your advice and will try to make the questions clearer and more straightforward to interpretate . I already took the suggestion of using exception-based handling over the return code. As to testing whether the previous function fails or succeeds, this doesn't really matter in the sense that I already mentioned a return code of 0. Ranting Rick is one of the list's resident trolls. Don't take it amiss that he turned his flamethrowers on you. :) ChrisA Given that Frank originally stated this I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0: if b() == 0: c() I can only see one way that you can possibly intepret it. Perhaps rr was dashing off a reply on a mobile device while doing a home run, hence wasn't concentrating on what Frank had actually said? -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Re: How can i return more than one value from a function to more than one variable
On Sunday, December 22, 2013 4:54:46 PM UTC-6, dec...@msn.com wrote: basically what I wanna do is this : x = 4 y = 7 def switch (z,w): ***this will switch z to w and vice verca*** c= z z=w w=c print 'Now x =', w, 'and y = ' , z return w x = switch(x,y) How am I supposed to do so I can return also a value to the variable y WITHOUT printing 'Now x =', w, 'and y = ' , z a second time ? thanks in advance Not sure I understand the problem but I think the answer is to put multiple values in a list and return the list. -- https://mail.python.org/mailman/listinfo/python-list
Re: How can i return more than one value from a function to more than one variable
return a tuple: return a, b, c or whatever On Sun, Dec 22, 2013 at 6:41 PM, Bob Rashkin rrash...@gmail.com wrote: On Sunday, December 22, 2013 4:54:46 PM UTC-6, dec...@msn.com wrote: basically what I wanna do is this : x = 4 y = 7 def switch (z,w): ***this will switch z to w and vice verca*** c= z z=w w=c print 'Now x =', w, 'and y = ' , z return w x = switch(x,y) How am I supposed to do so I can return also a value to the variable y WITHOUT printing 'Now x =', w, 'and y = ' , z a second time ? thanks in advance Not sure I understand the problem but I think the answer is to put multiple values in a list and return the list. -- https://mail.python.org/mailman/listinfo/python-list -- Joel Goldstick http://joelgoldstick.com -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Sun, 22 Dec 2013 14:49:43 -0500, Ned Batchelder wrote: On 12/22/13 2:10 PM, Frank Cui wrote: sorry, but what if I need to have different parameters in these functions ? Frank, welcome to the group. Common convention is to put your response below the exiting message, so that the conversation continues down the page. Ideally responses should be *interleaved* between parts of the quoted message, rather than just dumped at the end. The idea is that it's a conversation: Fred said: - How do I exfoliate my monkey? Get a friend to hold it down while you rub it all over with Extra Strength Monkey Exfoliating Cream. When you are done, give it a banana as a reward. - Once I have my exfoliated monkey, how do I convince - others that it is my child? Dress it in children's clothes, and make sure you tell people that he or she has a very sensitive artistic personality, and that is why you allow it to climb the walls. sort of thing. This also gives the writer the opportunity to trim out parts of the irrelevant text which is no longer relevant to the conversation, although it is considered polite to give some indication, usually [snip] or [...], that you have done so. See Wikipedia's article on posting styles for more information: http://en.wikipedia.org/wiki/Posting_styles -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
Frank Cui wrote: Someone else wrote: Frank, welcome to the group. Common convention is to put your response below the exiting message, so that the conversation continues down the page. Thanks for informing the rules. He forgot to mention the most important rule, which is: DON'T quote the entire message you're replying to! Only quote small pieces of it, like I did above, just enough to establish context. Then put your reply to that point under the quoted text. -- Greg -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Sun, 22 Dec 2013 15:37:04 -0300, Frank Cui wrote: hey guys, I have a requirement where I need to sequentially execute a bunch of executions, each execution has a return code. the followed executions should only be executed if the return code is 0. is there a cleaner or more pythonic way to do this other than the following ? if a() == 0: if b() == 0: c() I don't believe there is a clean way to deal with error return codes in *any* language, but certainly not Python. If you only have a few such functions, you can mis-use boolean operators to get the result you want, at the cost of misleading code: a() == 0 and b() == 0 and c() But that's pretty horrible code, because it looks like you're testing a condition when you're really trying to run a, b, c etc. for their side- effects. Code that relies on side-effects is usually a sign of poor design. A better alternative is to modify the functions so that instead of returning 0 on failure and (I'm guessing here) None on success, they raise an exception instead. Instead of: def a(): do_this() do_that() if condition: return 0 do_something_else() you re-write it as: def a(): do_this() do_that() if condition: raise SomeError(something broke) do_something_else() Then you can do this: try: a() b() c() except SomeError: handle_error() What if you can't edit all the various a, b, c functions because other parts of your code rely on them returning an error result? That's easy, you just need an adaptor: import functools def adapt(func): @functools.wraps(func) def inner(*args, **kwargs): result = func(*args, **kwargs) if result == 0: raise SomeError(some message) return inner try: adapt(a)() adapt(b)() adapt(c)() except SomeError: handle_error() Another option really only applies if all the functions use the same set of arguments. def chain(list_of_functions, *args, **kwargs): for func in list_of_functions: result = func(*args, **kwargs) if result == 0: break -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: How can i return more than one value from a function to more than one variable
Unfortunately, the original post seems to have gone missing here, so please excuse me for breaking threading. On Sunday, December 22, 2013 4:54:46 PM UTC-6, dec...@msn.com wrote: basically what I wanna do is this : x = 4 y = 7 def switch (z,w): ***this will switch z to w and vice verca*** c= z z=w w=c print 'Now x =', w, 'and y = ' , z return w x = switch(x,y) How am I supposed to do so I can return also a value to the variable y WITHOUT printing 'Now x =', w, 'and y = ' , z a second time ? To swap two values in Python (or for that matter, three or thirty-three values!) just re-assign the values. Python guarantees that this will work: x = 23 y = 42 x, y = y, x x now has the value that y had, and y has the value that x had. There is no need for a temporary value, and no need for a switch function. To return more than one value from a function, return a list or a tuple. Normally we use a tuple: def sum_and_product(x, y): sum = x + y product = x*y return (sum, product) a = 100 b = 2 s, p = sum_and_product(a, b) Now s will have the value 102 and p will have the value 200. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: How can i return more than one value from a function to more than one variable
On Sun, 22 Dec 2013 15:41:06 -0800 (PST), Bob Rashkin rrash...@gmail.com wrote: On Sunday, December 22, 2013 4:54:46 PM UTC-6, dec...@msn.com wrote: How am I supposed to do so I can return also a value to the variable y WITHOUT printing 'Now x =', w, 'and y = ' , z a second time ? You are apparently asking 3 questions. To exchange 2 values, use the tuple-unpack approach. a, b = b, a To get the equivalent of multiple return values, return a tuple. def myfunc (a): x = a*a y = 2+a return x, y p , q = myfunc (5) To avoid executing your print twice, call the function only once. And a bonus one: to avoid my getting a blank message in this text newsgroup, post in text, not html. -- DaveA -- https://mail.python.org/mailman/listinfo/python-list
Re: How can i return more than one value from a function to more than one variable
Something funny is going on here, not only has the original gone missing, but my reply apparently has also gone missing. Let me try again, and apologies for if you see duplicate messages. On Sunday, December 22, 2013 4:54:46 PM UTC-6, dec...@msn.com wrote: basically what I wanna do is this : x = 4 y = 7 def switch (z,w): ***this will switch z to w and vice verca*** c= z z=w w=c print 'Now x =', w, 'and y = ' , z return w x = switch(x,y) How am I supposed to do so I can return also a value to the variable y WITHOUT printing 'Now x =', w, 'and y = ' , z a second time ? There is no need for a function to swap two values. In Python, if you want to swap two values (or three, or thirty-three for that matter!) just reassign them all at once. x = 23 y = 42 x, y = y, x Python guarantees that after this, x will have the value that y had, and y will have the value that x had. No need for a function! To return two or more values from a function, use a tuple: def sum_and_product(a, b): Return the sum and product of a and b. sum = a+b product = a*b return (sum, product) s, p = sum_and_product(100, 2) s will now have the value 102, and p the value 200. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: How can i return more than one value from a function to more than one variable
Something funny is going on here, not only has the original gone missing, but my reply apparently has also gone missing. Let me try again, and apologies for if you see duplicate messages. On Sunday, December 22, 2013 4:54:46 PM UTC-6, dec...@msn.com wrote: basically what I wanna do is this : x = 4 y = 7 def switch (z,w): ***this will switch z to w and vice verca*** c= z z=w w=c print 'Now x =', w, 'and y = ' , z return w x = switch(x,y) How am I supposed to do so I can return also a value to the variable y WITHOUT printing 'Now x =', w, 'and y = ' , z a second time ? There is no need for a function to swap two values. In Python, if you want to swap two values (or three, or thirty-three for that matter!) just reassign them all at once. x = 23 y = 42 x, y = y, x Python guarantees that after this, x will have the value that y had, and y will have the value that x had. No need for a function! To return two or more values from a function, use a tuple: def sum_and_product(a, b): Return the sum and product of a and b. sum = a+b product = a*b return (sum, product) s, p = sum_and_product(100, 2) s will now have the value 102, and p the value 200. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
testing
Is this thing still working? -- Steven -- https://mail.python.org/mailman/listinfo/python-list
Re: testing
On Mon, Dec 23, 2013 at 11:50 AM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Is this thing still working? Working fine. I saw three messages from you in the other thread. Sending to you as well as the list in case you're not receiving. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
In article 52b782db$0$6599$c3e8da3$54964...@news.astraweb.com, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Code that relies on side-effects is usually a sign of poor design. I don't understand what you're trying to say there. A bit later in your post, you wrote: try: a() b() c() except SomeError: handle_error() Clearly, since the return values of a(), b(), and c() aren't saved, the only reason they're getting called is for their side effects. And I don't see anything wrong with that. BTW, there's a pattern we use a bunch in the Songza server code, which is sort of this, but in reverse. We'll have a bunch of possible ways to do something (strategies, to use the pattern vernacular), and want to try them all in order until we find one which works. So, for example: classes = [ClientDebugPicker, StatefulSongPicker, SWS_SequentialSongPicker, StandardSongPicker] for cls in classes: picker = cls.create(radio_session, station, artist) if picker: return picker else: assert 0, can't create picker (classes = %s) % classes Each SongPicker subclass encapsulates some logic for how to pick the next song. It can also decide if the strategy it implements is appropriate for the particular request; create() either returns an instance of the class, or None. Returning None means, I'm not the right picker for this request; try the next one and see what he says. -- https://mail.python.org/mailman/listinfo/python-list
Re: testing
In article 52b788bb$0$6599$c3e8da3$54964...@news.astraweb.com, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Is this thing still working? Yes. Do you want to know how many times your previous message was posted? :-) -- https://mail.python.org/mailman/listinfo/python-list
Re: Newbie question. Are those different objects ?
On 21/12/2013 2:00 AM, Mark Lawrence wrote: Shall I write a PEP asking for a language change which requires that that stupid = sign is replaced by a keyword reading something like thenameonthelefthandsideisassignedtheobjectontherighthandside ? I propose: tag obj with name -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Mon, Dec 23, 2013 at 12:24 PM, Roy Smith r...@panix.com wrote: Each SongPicker subclass encapsulates some logic for how to pick the next song. It can also decide if the strategy it implements is appropriate for the particular request; create() either returns an instance of the class, or None. Returning None means, I'm not the right picker for this request; try the next one and see what he says. But in that instance, the picker has done nothing. The main effect is to return a value, and since it returned None, you go on to do something else. This looks fine: foo = a() or b() or c() And it also looks like it would be safe to drop one of the calls if you know it won't succeed: if no_way_that_b_will_work: foo = a() or c() The point about side effects is that b() still has to be called, here, and the original statement doesn't make that clear. When you call a function and ignore its return value, you're clearly doing it for its side effects. Imagine this: width_required = max(len(foo),len(bar),len(quux)) Any sane reader is going to assume that the length checks aren't going to have side effects... but they could! Imagine if testing the length of something forced it to be loaded into memory, thus triggering any exception that would otherwise not be triggered until the thing got loaded much later. Vaguely plausible, but bad design because it's extremely unclear. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
Roy Smith wrote: In article 52b782db$0$6599$c3e8da3$54964...@news.astraweb.com, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Code that relies on side-effects is usually a sign of poor design. I don't understand what you're trying to say there. I'm trying to say that code that relies on side-effects is usually a sign of poor design. Is that more clear now? :-) I'm not a functional programming zealot, but imperative programming that relies on side-effects is often harder to reason about than functional style, due to lack of locality in its effects. With functions that communicate only through their input arguments and output result, you don't have to look far to see the effects the function call has: it is *only* in the return result. But if it has side-effects, you potentially have to inspect the entire program and environment to see what it has done. Now of course sometimes the whole point of the function is to have a side-effect (print something, delete or save a file, start up the car's engine, ...) and even functional languages usually have some facility for side-effects. And we can often limit the harm of relying on side-effects but narrowly constraining what those side-effects are. E.g. list.append has a very narrow and well-defined side-effect, which makes it relatively easy to reason about it. But still not as easy as perhaps we would like: alist = blist = [1, 2, 4, 8] # later on alist.append(16) # operates by side-effect # and still later on assert blist == [1, 2, 4, 8] # FAILS!!! A side-effect free language might make list.append return a new list with the extra value appended, and then the above would not occur. But I digress. The point is, I'm not saying that imperative code that operates via side-effects is always harmful. There are degrees of badness. A bit later in your post, you wrote: try: a() b() c() except SomeError: handle_error() Clearly, since the return values of a(), b(), and c() aren't saved, the only reason they're getting called is for their side effects. That's not my design :-) And I don't see anything wrong with that. And quite frankly, neither do I. But I don't know what a, b and c actually do. BTW, there's a pattern we use a bunch in the Songza server code, which is sort of this, but in reverse. We'll have a bunch of possible ways to do something (strategies, to use the pattern vernacular), and want to try them all in order until we find one which works. Sounds reasonable. You're not operating by side-effect, since you actually do want the result generated by the strategy. Presumably the strategy signature is to return None on failure, or instance on success. (I see below that's exactly what you do.) So, for example: classes = [ClientDebugPicker, StatefulSongPicker, SWS_SequentialSongPicker, StandardSongPicker] for cls in classes: picker = cls.create(radio_session, station, artist) if picker: return picker This seems perfectly reasonable up. The strategy either returns a picker, in which case you are done, or it returns None and you continue. No side-effects are involved. else: assert 0, can't create picker (classes = %s) % classes ¡Ay, caramba! I was with you until the very last line. The above code is possibly buggy and inappropriately designed. (I may be completely misinterpreting this, in which case feel free to ignore the following rant.) First, the bug: there are circumstances where no exception is raised even if all the strategies fail. (If the StandardSongPicker is guaranteed to succeed, then obviously my analysis is wrong.) In this case, then any code following the for-else will execute. Since this is in a function, and there doesn't seem to be any following code, that means that your function will return None instead of a valid picker. Does the rest of your code check for None before using the picker? If not, you have a bug waiting to bite. Second, the poor design. When it works as expected, failure is indicated by AssertionError. Why AssertionError? Why not ImportError, or UnicodeEncodeError, or ZeroDivisionError, or any other of the dozens of inappropriate errors that the code could (but shouldn't) raise? I guess nobody here would write code that looks like this by design: try: picker = select_picker(radio_session, station, artist) except EOFError: handle_no_picker_case() just because raise EOFError required less typing than raising some more appropriate exception. So why would we write: try: picker = select_picker(radio_session, station, artist) except AssertionError: handle_no_picker_case() just because assert required less typing than raising some more appropriate exception? assert is not a short-cut for raise SomeGenericException. AssertionError has a specific meaning, and it is sloppy to misuse it. An
python socket query
Hi, I am trying to write a TCP socket program in python. I am using python 2.6 in linux. I referred following link: http://www.ibm.com/developerworks/linux/tutorials/l-pysocks/section4.html I am actually writing the client-side stream socket. I wrote a small program which creates the socket, bind to the socket, connect to socket and send() close(). I see that there is no reply coming from server and the TCP disconnect happens. import socket def tcp(host, request, port=34567): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((host, port)) s.send(request) reply = s.recv(2**14) s.close() return reply My problem is even if the request is sent the length(reply) is is 0. I tried to put a timeout of 1 sec s.settimeout() call after the send call but it doesnot help. I tried by commenting s.close() still it did not work. Any idea what is the problem? Regards Pradeep -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Mon, Dec 23, 2013 at 1:33 PM, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Anyway, I may be completely misinterpreting what I'm reading. Perhaps the assertion is checking a function invariant (one of the strategies will always succeed) in which case you're doing it exactly right and I should shut up now :-) Or maybe it has a lengthy piece of error trapping code that wasn't germane to the discussion, and for brevity was squished down to a quick little assert :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: python socket query
On Mon, Dec 23, 2013 at 2:05 PM, smilesonisa...@gmail.com wrote: I wrote a small program which creates the socket, bind to the socket, connect to socket and send() close(). I see that there is no reply coming from server and the TCP disconnect happens. import socket def tcp(host, request, port=34567): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((host, port)) s.send(request) reply = s.recv(2**14) s.close() return reply First off, your formatting has become mangled. This is likely to be because of Google Groups, which tends to make a mess of posts. I strongly recommend you get a better newsreader, such as Thunderbird, or switch to the mailing list: https://mail.python.org/mailman/listinfo/python-list I'm going to assume that (a) the code you've provided is all part of the tcp() function, and (b) that you are actually calling tcp() somewhere and seeing what comes back. But once you sort out your posting issues, you may want to post a complete program (probably not more than a couple of additional lines beyond what you have above) so we know what's actually going on. Terminology point: You mention binding to the socket. In networking, bind has a specific meaning - binding to an address, usually done for servers, and something you're not doing here. Are you sure the server's doing something? I tried what you had there (albeit under Python 3.3), and it seems to be fine. Perhaps you need to terminate the request with something - maybe a newline. The send() method will send exactly the bytes you give it, nothing more. Can you telnet to the server? ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Airplane mode control using Python?
Hi,
I am trying to control Aeroplane mode on Android using Python code. I am
running QPyPlus python. When I execute this code(that is widespread in the
net),
#!/usr/bin/python
import android droid = android.Android()
# go to airplane mode
droid.toggleAirplaneMode()
droid.makeToast('exiting')
I get the error 'no such attribute Android()'.
One important thing is, I want to be able to do this without the need to reboot
the Android device and any other working solution is also fine long as it is
invokeable through Python.
Thanks,
Kevin Peterson
--
https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Mon, Dec 23, 2013 at 2:10 PM, Dennis Lee Bieber wlfr...@ix.netcom.com wrote: Having spent 22 years with VMS, 0 - success is still a problem to me. Odd result codes (aka True) were 1-success/3-information, even results (False) were 0-warning/2-error/4-fatal Having spent a similar amount of time with Unix, C, and various APIs, I'm quite used to 0 meaning success and nonzero meaning error. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Airplane mode control using Python?
On Mon, Dec 23, 2013 at 2:20 PM, Kevin Peterson qh.res...@gmail.com wrote:
I am trying to control Aeroplane mode on Android using Python code. I am
running QPyPlus python. When I execute this code(that is widespread in the
net),
#!/usr/bin/python
import android droid = android.Android()
# go to airplane mode
droid.toggleAirplaneMode()
droid.makeToast('exiting')
I get the error 'no such attribute Android()'.
Python code is sensitive to changes in whitespace. The above is
actually a syntax error, because lines have been merged and indented
incorrectly. You seem to be posting from Google Groups, which may be
why it's messed up; I recommend switching to something else, like
Mozilla Thunderbird, or subscribing instead to the mailing list (with
all the same content):
https://mail.python.org/mailman/listinfo/python-list
ChrisA
--
https://mail.python.org/mailman/listinfo/python-list
Re: Airplane mode control using Python?
On 12/22/2013 08:20 PM, Kevin Peterson wrote:
Hi,
I am trying to control Aeroplane mode on Android using Python code.
I am running QPyPlus python. When I execute this code(that is widespread
in the net),
#!/usr/bin/python
import android droid = android.Android()
# go to airplane mode
droid.toggleAirplaneMode()
droid.makeToast('exiting')
I get the error 'no such attribute Android()'.
Is that really how your code is formatted? The import line is an error.
try:
import android
droid = android.Android()
--
https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On 23/12/2013 03:22, Chris Angelico wrote: On Mon, Dec 23, 2013 at 2:10 PM, Dennis Lee Bieber wlfr...@ix.netcom.com wrote: Having spent 22 years with VMS, 0 - success is still a problem to me. Odd result codes (aka True) were 1-success/3-information, even results (False) were 0-warning/2-error/4-fatal Having spent a similar amount of time with Unix, C, and various APIs, I'm quite used to 0 meaning success and nonzero meaning error. ChrisA Another C thing to complain about, with functions like malloc the status code and value returned are one and the same thing, except that NULL is failure in this case. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Mon, Dec 23, 2013 at 2:43 PM, Mark Lawrence breamore...@yahoo.co.uk wrote: Another C thing to complain about, with functions like malloc the status code and value returned are one and the same thing, except that NULL is failure in this case. How's that a problem? Python has the same: memory.get(1234) will return a bit of memory, or None if it can't get any. Not materially different. Remember, C doesn't have exceptions. In C++, the 'new' operator will throw an exception if it can't provide memory. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On 23/12/2013 03:45, Chris Angelico wrote: On Mon, Dec 23, 2013 at 2:43 PM, Mark Lawrence breamore...@yahoo.co.uk wrote: Another C thing to complain about, with functions like malloc the status code and value returned are one and the same thing, except that NULL is failure in this case. How's that a problem? Python has the same: Remembering to check it? memory.get(1234) You learn something new every day or April 1st come early? will return a bit of memory, or None if it can't get any. Not materially different. Remember, C doesn't have exceptions. In C++, the 'new' operator will throw an exception if it can't provide memory. ChrisA -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Mon, Dec 23, 2013 at 2:54 PM, Mark Lawrence breamore...@yahoo.co.uk wrote:
memory.get(1234)
You learn something new every day or April 1st come early?
memory = {1:Foo, 12:Bar, 123:Quux}
ChrisA
--
https://mail.python.org/mailman/listinfo/python-list
Re: Airplane mode control using Python?
On 12/22/13 10:41 PM, Michael Torrie wrote:
On 12/22/2013 08:20 PM, Kevin Peterson wrote:
Hi,
I am trying to control Aeroplane mode on Android using Python code.
I am running QPyPlus python. When I execute this code(that is widespread
in the net),
#!/usr/bin/python
import android droid = android.Android()
# go to airplane mode
droid.toggleAirplaneMode()
droid.makeToast('exiting')
I get the error 'no such attribute Android()'.
Is that really how your code is formatted? The import line is an error.
try:
import android
droid = android.Android()
The OP reported an error of no such attribute Android, it's pretty
obvious that he isn't getting a syntax error. We can assume the code
has been mangled in the posting.
Your code sample (once the obvious formatting errors have been fixed) is
identical to ones I've found online, so I assume it should work.
My best guess is that you have named your own file android.py, shadowing
the library you're trying to import. Name it something else, delete all
the *.pyc files in your directory, and try again.
--
Ned Batchelder, http://nedbatchelder.com
--
https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
In article 52b7a0e4$0$29994$c3e8da3$54964...@news.astraweb.com, Steven D'Aprano steve+comp.lang.pyt...@pearwood.info wrote: Anyway, I may be completely misinterpreting what I'm reading. Perhaps the assertion is checking a function invariant (one of the strategies will always succeed) in which case you're doing it exactly right and I should shut up now :-) Yes :-) More specifically, the assertion exception will get caught way up in some django middleware which will log a stack trace and return a HTTP 50-something. This will typically be followed by somebody like me noticing the stack dump and trying to figure out WTF happened. Assertions are great tools. People should use them more often. In a sense, they're executable comments. They're a programmer's way of standing on a hilltop and shouting to all the world, I swear to you, this is true. There may be a gazillion lines of code out there and GBytes of program state, but right here, right now, within this circle I've drawn in the sand, I know this to be true, and you can depend on that. You can make it part of the foundation on which you begin to reason about program behavior. Furthermore, if it turns out not to be true, you don't have to worry about figuring out who's fault it is. I hereby declare that it's my fault. -- https://mail.python.org/mailman/listinfo/python-list
Re: cascading python executions only if return code is 0
On Mon, Dec 23, 2013 at 3:57 PM, Roy Smith r...@panix.com wrote: More specifically, the assertion exception will get caught way up in some django middleware which will log a stack trace and return a HTTP 50-something. This will typically be followed by somebody like me noticing the stack dump and trying to figure out WTF happened. Assertions are great tools. People should use them more often. You do have to be careful though, because they can be compiled out. If it really is a can't happen, then sure, but encouraging people to use them for potentially obscure cases may be dangerous - if you never happen to hit on it during development and then run with assertions disabled, you won't see that stack trace. However, they're still a lot more executable than other forms of comment :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Airplane mode control using Python?
On 12/22/2013 08:33 PM, Chris Angelico wrote:
On Mon, Dec 23, 2013 at 2:20 PM, Kevin Peterson qh.res...@gmail.com wrote:
I am trying to control Aeroplane mode on Android using Python code.
I am running QPyPlus python. When I execute this code(that is
widespread in the net),
#!/usr/bin/python
import android droid = android.Android()
# go to airplane mode
droid.toggleAirplaneMode()
droid.makeToast('exiting')
I get the error 'no such attribute Android()'.
Python code is sensitive to changes in whitespace. The above is
actually a syntax error, because lines have been merged and indented
incorrectly. You seem to be posting from Google Groups, which may be
why it's messed up; I recommend switching to something else, like
Mozilla Thunderbird, or subscribing instead to the mailing list
(with all the same content)
My electricity went out right around the time the OP posted
from Google Groups, that too was undoubtedly GG's fault.
Come on Chris, it is just as easy to make typo or copy-and-
paste errors in any other software as GG, there is no evidence
that it was GG's fault.
If you want to recommend the mailing list, fine, but please
don't make stupid, unfounded, accusatory suggestions.
Kevin: just for your own info, there are a few people here
who despise Google Groups. I and many other people post
from Google Groups regularly and it works fine. You might
want to take a look at
https://wiki.python.org/moin/GoogleGroupsPython
for some ways to reduce the annoyance factor for the anti-GG
clique here.
--
https://mail.python.org/mailman/listinfo/python-list
Re: 2nd Try: Trouble writing lines to file that include line feeds - Newbie
Solved. Simply change the 'w' from the file.open method to an 'a' for append
On Sunday, December 22, 2013 7:55:28 PM UTC-5, Dan Healy wrote:
Overview: I'm attempting to read strings from a serial port. Each string ends
with a carriage return and line feed. I want to write those strings to a
file, like a log file. So, if I send P1 and the P2 on a new line, I would
expect to open this file and find (line 1) P1 (line 2) P2.
Problem: The file only contains P2. It always overwrites the first line. I
can send 20 strings and the file will always contain the last string
received.
Code:
#Import the serial module
import serial
#Open the serial port w/ settings
ser=serial.Serial(
port=/dev/ttyUSB0,
baudrate=9600,
timeout=None)
#Print data received on the serial port after removing the CR and LF
characters
while True:
rawcode=ser.readline()
codelog=open('/home/pi/avdms/codes.log','w')
codelog.write(rawcode)
codelog.close()
--
https://mail.python.org/mailman/listinfo/python-list
Re: Airplane mode control using Python?
On Mon, Dec 23, 2013 at 3:52 PM, ru...@yahoo.com wrote: Come on Chris, it is just as easy to make typo or copy-and- paste errors in any other software as GG, there is no evidence that it was GG's fault. Actually, formatting errors ARE often caused by Google Groups. Maybe it wasn't in this instance, but I have seen several cases of GG mangling code formatting, so this was a perfectly reasonable theory. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: Airplane mode control using Python?
I will take care.
Thanks,
On Mon, Dec 23, 2013 at 10:22 AM, ru...@yahoo.com wrote:
On 12/22/2013 08:33 PM, Chris Angelico wrote:
On Mon, Dec 23, 2013 at 2:20 PM, Kevin Peterson qh.res...@gmail.com
wrote:
I am trying to control Aeroplane mode on Android using Python code.
I am running QPyPlus python. When I execute this code(that is
widespread in the net),
#!/usr/bin/python
import android droid = android.Android()
# go to airplane mode
droid.toggleAirplaneMode()
droid.makeToast('exiting')
I get the error 'no such attribute Android()'.
Python code is sensitive to changes in whitespace. The above is
actually a syntax error, because lines have been merged and indented
incorrectly. You seem to be posting from Google Groups, which may be
why it's messed up; I recommend switching to something else, like
Mozilla Thunderbird, or subscribing instead to the mailing list
(with all the same content)
My electricity went out right around the time the OP posted
from Google Groups, that too was undoubtedly GG's fault.
Come on Chris, it is just as easy to make typo or copy-and-
paste errors in any other software as GG, there is no evidence
that it was GG's fault.
If you want to recommend the mailing list, fine, but please
don't make stupid, unfounded, accusatory suggestions.
Kevin: just for your own info, there are a few people here
who despise Google Groups. I and many other people post
from Google Groups regularly and it works fine. You might
want to take a look at
https://wiki.python.org/moin/GoogleGroupsPython
for some ways to reduce the annoyance factor for the anti-GG
clique here.
--
https://mail.python.org/mailman/listinfo/python-list
--
https://mail.python.org/mailman/listinfo/python-list
Numpy Folder Structure
Hi all, Please help me with how we can make our folder structure similar to Numpy Folder structure , so that we can make our installer similar to the numpy. With the folder structure now I am having , if I install , it is directly installing without the folder in site packages unlike numpy. Thanks regards, Chandru CAUTION - Disclaimer * This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS End of Disclaimer INFOSYS*** -- https://mail.python.org/mailman/listinfo/python-list
Re: Airplane mode control using Python?
On 23/12/2013 04:52, ru...@yahoo.com wrote:
On 12/22/2013 08:33 PM, Chris Angelico wrote:
On Mon, Dec 23, 2013 at 2:20 PM, Kevin Peterson qh.res...@gmail.com wrote:
I am trying to control Aeroplane mode on Android using Python code.
I am running QPyPlus python. When I execute this code(that is
widespread in the net),
#!/usr/bin/python
import android droid = android.Android()
# go to airplane mode
droid.toggleAirplaneMode()
droid.makeToast('exiting')
I get the error 'no such attribute Android()'.
Python code is sensitive to changes in whitespace. The above is
actually a syntax error, because lines have been merged and indented
incorrectly. You seem to be posting from Google Groups, which may be
why it's messed up; I recommend switching to something else, like
Mozilla Thunderbird, or subscribing instead to the mailing list
(with all the same content)
My electricity went out right around the time the OP posted
from Google Groups, that too was undoubtedly GG's fault.
Come on Chris, it is just as easy to make typo or copy-and-
paste errors in any other software as GG, there is no evidence
that it was GG's fault.
If you want to recommend the mailing list, fine, but please
don't make stupid, unfounded, accusatory suggestions.
Kevin: just for your own info, there are a few people here
who despise Google Groups. I and many other people post
from Google Groups regularly and it works fine. You might
want to take a look at
https://wiki.python.org/moin/GoogleGroupsPython
for some ways to reduce the annoyance factor for the anti-GG
clique here.
We are *NOT* anti-GG, we've anti-reading double spaced crap, continuous
single lines instead of proper paragraphs and badly formed Python source
code amongst other things. We *DON'T* as a rule of thumb get this
problem from any source except GG.
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
--
https://mail.python.org/mailman/listinfo/python-list
Daemonify my python script on Android
Hi, I want to daemonify my python script on Android device. That is, it should be automatically invoked on boot up. Appreciate your help. Thanks KP -- https://mail.python.org/mailman/listinfo/python-list
[issue20009] Property should expose wrapped function.
Raymond Hettinger added the comment:
When using the @property decorator the wrapped functions
are not exposed for source introspection.
(At least I can't see how they are.)
The underlying functions are already exposed as the fget, fset, and fdel
attributes of property objects.
Here is an example of how to access the source:
class Dog:
@property
def age(self):
return 42
if __name__ == '__main__':
import inspect
age_property = Dog.__dict__['age']
lines, size = inspect.getsourcelines(age_property.fget)
print(''.join(lines))
--
nosy: +rhettinger
___
Python tracker rep...@bugs.python.org
http://bugs.python.org/issue20009
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19363] Python 2.7's future_builtins.map is not compatible with Python 3's map
Raymond Hettinger added the comment: I agree with you in principle, but it is far too late in 2.7's development to take away a capability. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19363 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20045] setup.py register --list-classifiers is broken
Giampaolo Rodola' added the comment: Thanks for fixing. =) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20045 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20049] string.lowercase and string.uppercase can contain garbage
Antoine Pitrou added the comment: I've discussed this once more. From islower man page: RETURN VALUES If the argument to any of the character handling macros is not in the domain of the function, the result is undefined. This is not the wording of the POSIX spec: http://pubs.opengroup.org/onlinepubs/9699919799/functions/islower.html The c argument is an int, the value of which the application shall ensure is a character representable as an unsigned char or equal to the value of the macro EOF. This means that any value between 0 and 255 (representable as an unsigned char) is a valid input for islower(). This would mean IllumOS deviates from the POSIX spec here. I would suggest either fixing your libc's ctype.h implementation, and/or patching your version of Python to workaround this issue. Note the ISO C99 standard has the same wording as POSIX: The header ctype.h declares several functions useful for classifying and mapping characters. In all cases the argument is an int, the value of which shall be representable as an unsigned char or shall equal the value of the macro EOF. (Note also that under Linux and most likely other Unices, string.lowercase and string.uppercase work fine under a UTF-8 locale) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20049 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20045] setup.py register --list-classifiers is broken
Antoine Pitrou added the comment: Thanks for fixing. =) You're welcome. Unfixed distutils regressions are painful... -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20045 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20049] string.lowercase and string.uppercase can contain garbage
Antoine Pitrou added the comment: To elaborate yet a bit, I agree with the following statement in the aforementioned [illumos-devel] discussion thread: In further explanation, the isalpha() and friends *should* probably return false for the value 196, or any other byte with high order bit set, in UTF-8 locales. http://thread.gmane.org/gmane.os.illumos.devel/14193/focus=14206 I'll also point out that the code examples in the POSIX spec use islower() exactly like Python does (on arbitrary integers) between 0 and 255: http://pubs.opengroup.org/onlinepubs/9699919799/functions/islower.html c = (unsigned char) (rand() % 256); ... if (islower(c)) keystr[len++] = c; } ... -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20049 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20049] string.lowercase and string.uppercase can contain garbage
Antoine Pitrou added the comment: As to whether we will add a workaround for this in Python: - Python follows POSIX correctly here, and no issue was reported in mainstream OSes such as Linux, OS X or the *BSDs - this only exists in 2.7, which is in extended maintenance mode (it's the last of the 2.x series, and will probably stopped being maintained in a few years); Python 3.x doesn't have this issue - IllumOS is a rather niche OS that none of us is using, so adding a system-specific workaround doesn't sound very compelling Thanks for reporting, though. It's good to be reminded that locales and ctype.h are a rather lousy design :-) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20049 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20049] string.lowercase and string.uppercase can contain garbage
Stefan Krah added the comment: Alexander, the domain fo the function probably refers to the range [-1, 256]. C99: The header ctype.h declares several functions useful for classifying and mapping characters.166) In all cases the argument is an int, the value of which shall be representable as an unsigned char or shall equal the value of the macro EOF. If the argument has any other value, the behavior is undefined. 2 The behavior of these functions is affected by the current locale. Those functions that have locale-specific aspects only when not in the C locale are noted below. 3 The term printing character refers to a member of a locale-specific set of characters, each of which occupies one printing position on a display device; the term control character refers to a member of a locale-specific set of characters that are not printing characters.167) All letters and digits are printing characters. Forward references: EOF (7.19.1), localization (7.11). 7.4.1 Character classification functions 1 The functions in this subclause return nonzero (true) if and only if the value of the argument c conforms to that in the description of the function. I think this agrees with what Antoine has said. -- nosy: +skrah ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20049 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20049] string.lowercase and string.uppercase can contain garbage
Stefan Krah added the comment: IOW, I also support closing this issue. :) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20049 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20049] string.lowercase and string.uppercase can contain garbage
R. David Murray added the comment: Yes, I definitely think this falls into the category of platform bugs, and we only maintain workarounds for those for mainstream OSes. Others need to maintain their own local patches, just as for any other changes that are required to get Python working on those platforms. (A platform's status can change over time, of course, but this is the category illumos currently falls into.) -- resolution: - rejected stage: - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20049 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19610] TypeError in distutils.command.upload
Antoine Pitrou added the comment: I don't think accepting a tuple for classifiers is a bugfix. Furthermore, the latest patch is much too intrusive and may break legitimate uses. -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19610 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue17325] improve organization of the PyPI distutils docs
Antoine Pitrou added the comment: This looks good to me. It may also be worth changing example URLs to use https instead of http, and mentioning the test PyPI server in the pypirc section: https://wiki.python.org/moin/TestPyPI Chris, please proceed. -- assignee: eric.araujo - chris.jerdonek nosy: +pitrou stage: patch review - commit review versions: -Python 3.2 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue17325 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9303] Migrate sqlite3 module to _v2 API to enhance performance
Changes by Antoine Pitrou pit...@free.fr: -- versions: +Python 3.5 -Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9303 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19216] stat cache for import bootstrap
Changes by Antoine Pitrou pit...@free.fr: -- versions: +Python 3.5 -Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19216 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue15216] Support setting the encoding on a text stream after creation
Changes by Antoine Pitrou pit...@free.fr: -- versions: +Python 3.5 -Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue15216 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19508] Add warning that Python doesn't verify SSL certs by default
Changes by Antoine Pitrou pit...@free.fr: -- status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19508 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue15340] OSError with import random when /dev/urandom doesn't exist (regression from 2.6)
Antoine Pitrou added the comment: 2.6 and 3.1 don't receive bug fixes anymore, closing. -- resolution: - fixed stage: - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue15340 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19610] setup.py should allow a tuple for classifiers
Changes by Antoine Pitrou pit...@free.fr: -- stage: patch review - needs patch title: TypeError in distutils.command.upload - setup.py should allow a tuple for classifiers type: behavior - enhancement versions: -Python 3.3 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19610 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue20033] Fix makelocalealias.py for Python 3
Antoine Pitrou added the comment: Sounds ok to me. -- assignee: - serhiy.storchaka nosy: +pitrou stage: - commit review ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue20033 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19940] ssl.cert_time_to_seconds() returns wrong results if local timezone is not UTC
gudge added the comment: 1) I understand I can run a whole test suite as ./python -m test -v test_abc as mentioned in http://docs.python.org/devguide/runtests.html How do I run a particluar test case, like the test I added test_cert_time_to_seconds 2) I have a added a test case test_cert_time_to_seconds to test_ssl.py. 3) ./python -m test -v test_ssl is all PASS. 4) I will start my work on http://bugs.python.org/issue19940#msg205860. 5) The patch is attached. -- Added file: http://bugs.python.org/file33254/patch.txt ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19940 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16136] Removal of VMS support
John Malmberg added the comment: Access to VMS licenses and media: 1. Hobby - non-commercial applications - Free with 1 year time-bombed license keys with free media download. A self-service mostly web based system. http://www.openvms.org/pages.php?page=Hobbyist Easiest way to get a membership ID is to join Encompasserve.org which is free. Unfortunately right now, HP is in their holiday shutdown and Encompasserve.org is being relocated from Wisconsin to Massachusetts. Both should be back available sometime in the beginning of January 2014. 2. Commercial - Company Alliance One Membership. It is my understanding that upon acceptance to the program, 1 year time-bombed license keys are available with free. Search for Alliance One on the HP site. This has been the case for well over 10 years, so VMS programmers for open source projects should normally have no problem getting current media or license keys. There are several free Alpha emulators now available for download. These are less functional versions of the commercial versions of the emulator. While there are also commercial VAX emulators that may be available, SimH VAX is free and open source. Resources: comp.os.vms newsgroup, www.openvmshobbyist.com, sourceforge GNV and vms-ports projects, encompasserve.org, and www.openvms.org GNV: GNV as packaged by HP has multiple problems. To use it at a minimum you need to install the newer Bash and Coreutils kits from the GNV sourceforge project. Read http://sourceforge.net/p/gnv/wiki/InstallingGNVPackages/ before installing the updates. Running configure scripts on GNV typically requires some hacks because most configure scripts test with out the header files, and on VMS, the header files are needed to get ANSI/ISO or X/Open behavior or bug-fixes. Otherwise the tests fail. Instructions: http://sourceforge.net/p/vms-ports/wiki/GeneratingConfigh/ As far as removing the VMS specific code, it is very likely that much of the VMS specific code is not needed for the current 8.3/8.4 versions of VMS, so it is probably better for a someone porting Python 3.x to VMS to start with clean code. If a VMS library routine is missing or does not behave properly, it is better handled with a replacement routine than by putting #ifdef in the code. -- nosy: +John.Malmberg status: pending - open ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue16136 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19927] Path-based loaders lack a meaningful __eq__() implementation.
Larry Hastings added the comment: 1. Is this patch going to change best practice for working with ModuleSpec? 2. If we delayed it to 3.5, will users have to ignore it to work around the deficiencies of the ModuleSpec implementation in 3.4? I'm guessing the answer to both of these is well, no, not really simply because comparing ModuleSpec objects is not expected to be a regular operation. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19927 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19610] setup.py should allow a tuple for classifiers
Éric Araujo added the comment: Classifiers have always been documented as a list; I don’t think a tuple makes more sense here (even if it does no harm), but more importantly I think it’s a bad idea to have a setup.py that would work in 3.5 and not in 3.2-3.4. I suggest rejecting this. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19610 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19648] Empty tests in pickletester need to be implemented or removed
Changes by Antoine Pitrou pit...@free.fr: -- stage: needs patch - commit review ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19648 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19648] Empty tests in pickletester need to be implemented or removed
Antoine Pitrou added the comment: The patch looks fine to me. Gennadiy, could you go and sign a contributor's agreement? http://www.python.org/psf/contrib/ Thanks very much. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19648 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue18379] SSLSocket.getpeercert(): OCSP and CRL DP URIs
Changes by Antoine Pitrou pit...@free.fr: -- status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18379 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19563] Changing barry's email to ba...@python.org
Changes by Antoine Pitrou pit...@free.fr: -- assignee: - barry ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue19563 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
