[Tutor] stfftime question
Below is an example of me converting a datetime to milliseconds on a
Mac running Pythong 2.3.5. The same working code on a Solaris system
with Python 2.3.2 fails. Any thoughts? What arguments am I missing?
From my Mac
#
Python 2.3.5 (#1, Oct 5 2005, 11:07:27)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type help, copyright, credits or license for more information.
import datetime
dtstr = datetime.datetime(1973,9,4,04,3,25,453)
output = dtstr.strftime('%s.%%03d') % (dtstr.microsecond)
print output
115977805.453
From Work (Solaris)
Python 2.3.2 (#1, Nov 17 2003, 22:32:28)
[GCC 2.95.3 20010315 (release)] on sunos5
Type help, copyright, credits or license for more information.
import datetime
dtstr = datetime.datetime(1973,9,4,04,3,25,453)
output = dtstr.strftime('%s.%%03d') % (dtstr.microsecond)
Traceback (most recent call last):
File stdin, line 1, in ?
TypeError: not enough arguments for format string
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[Tutor] Query regarding Unittest module behaviour
Hi,I have 2 scripts , abc.py and xyz.py, In both I have made unittest cases using the unittest module.Script abc.py imports xyz.py.Now when I execute abc.py from commandlline all unittestcases of xyz.py are also executed. Why is this happening and what can be the solution to this.Also I have tried commenting the unittest.main() in xyz.py, but all in vain.Please helpAkanksha __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] stfftime question
I found a temporary solution. The goal in the end was to compare two
dates/times and retrieve the millisecond delta between the two.
Work around
#
import datetime
import time
t1 = datetime.datetime(1973,9,4,04,3,25,453)
t2 = datetime.datetime(1973,9,4,04,3,25,553)
t1tuple = time.mktime(t1.timetuple())+(t1.microsecond/1000.)
t2tuple = time.mktime(t2.timetuple())+(t2.microsecond/1000.)
delta = (t2tuple - t1tuple) * 1000
print delta
On 7/4/06, Tom Tucker [EMAIL PROTECTED] wrote:
Below is an example of me converting a datetime to milliseconds on a
Mac running Pythong 2.3.5. The same working code on a Solaris system
with Python 2.3.2 fails. Any thoughts? What arguments am I missing?
From my Mac
#
Python 2.3.5 (#1, Oct 5 2005, 11:07:27)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type help, copyright, credits or license for more information.
import datetime
dtstr = datetime.datetime(1973,9,4,04,3,25,453)
output = dtstr.strftime('%s.%%03d') % (dtstr.microsecond)
print output
115977805.453
From Work (Solaris)
Python 2.3.2 (#1, Nov 17 2003, 22:32:28)
[GCC 2.95.3 20010315 (release)] on sunos5
Type help, copyright, credits or license for more information.
import datetime
dtstr = datetime.datetime(1973,9,4,04,3,25,453)
output = dtstr.strftime('%s.%%03d') % (dtstr.microsecond)
Traceback (most recent call last):
File stdin, line 1, in ?
TypeError: not enough arguments for format string
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Re: [Tutor] Moved Python installation. Need advice rebuilding all *.pyc
On 03/07/06, Andreas [EMAIL PROTECTED] wrote: On 03.07.2006 20:45 Adam wrote Erm trying to remember exactly how to do this in windows but if you do the equivalent of an rm -r E:\Python24\site-packages\*.pyc ie remove all the *.pyc files they will be rebuilt as and when you next import those modules. Thanks for the info. However, if this is being done automatically onimport, why does python setup.py install often do some compilation ?It reduces the loading time for the modules if there is already a *.pyc so the setup script often does it in advance. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] stfftime question
Tom Tucker wrote:
I found a temporary solution. The goal in the end was to compare two
dates/times and retrieve the millisecond delta between the two.
Work around
#
import datetime
import time
t1 = datetime.datetime(1973,9,4,04,3,25,453)
t2 = datetime.datetime(1973,9,4,04,3,25,553)
t1tuple = time.mktime(t1.timetuple())+(t1.microsecond/1000.)
t2tuple = time.mktime(t2.timetuple())+(t2.microsecond/1000.)
delta = (t2tuple - t1tuple) * 1000
print delta
You could also subtract the datetimes directly to get a timedelta:
In [13]: t1 = datetime.datetime(1973,9,4,04,3,25,453)
In [14]: t2 = datetime.datetime(1973,9,4,04,3,25,553)
In [15]: diff = t2-t1
In [16]: diff
Out[16]: datetime.timedelta(0, 0, 100)
In [17]: diff.microseconds
Out[17]: 100
or if the diff can be bigger use
((diff.days * 24*60*60) * diff.seconds) * 1000 + diff.microseconds
On 7/4/06, Tom Tucker [EMAIL PROTECTED] wrote:
Below is an example of me converting a datetime to milliseconds on a
Mac running Pythong 2.3.5. The same working code on a Solaris system
with Python 2.3.2 fails. Any thoughts? What arguments am I missing?
From my Mac
#
Python 2.3.5 (#1, Oct 5 2005, 11:07:27)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type help, copyright, credits or license for more information.
import datetime
dtstr = datetime.datetime(1973,9,4,04,3,25,453)
output = dtstr.strftime('%s.%%03d') % (dtstr.microsecond)
print output
115977805.453
I think you want '%S.%%03d' as the format string (uppercase S). %s is
not a standard format and it is probably handled differently on Mac OS
and Solaris. What is the result of dtstr.strftime('%s.%%03d') on each
machine? On Windows I get
In [11]: dtstr.strftime('%s.%%03d')
Out[11]: '.%03d'
Perhaps Solaris just passes the unknown format to output, that would
give the error you see.
Kent
From Work (Solaris)
Python 2.3.2 (#1, Nov 17 2003, 22:32:28)
[GCC 2.95.3 20010315 (release)] on sunos5
Type help, copyright, credits or license for more information.
import datetime
dtstr = datetime.datetime(1973,9,4,04,3,25,453)
output = dtstr.strftime('%s.%%03d') % (dtstr.microsecond)
Traceback (most recent call last):
File stdin, line 1, in ?
TypeError: not enough arguments for format string
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[Tutor] Correct way to code data or parse?
Hi Everyone
I'mnew to python and Iwant to write a rpgprogram thatis able to use theCorrect way to code data or parse? I have pagesof .PDF fileDatatables copied to text files.
I check outmany pythonboards Books with little illumination to my problem.
I'm still not sure about what to use for this data listing:
Lists?, Tuple? there is someexpressions with a variable(WP) in the data!Dictionary? same as Tuple?
Text file read?
Function?, Module?, Class?
How would a Pro approch this ?
What I'v been thinking is like this:
...
Very basic Brakedown of program: (#=Number Variables, $=StringData)
=
Which Damage Table? : ...
Type .. $(Cutting, Puncture, Bludgeon. Three(3) Types of weapon inflicted wounds)
Zone .. #(2d6 dice roll or Number generated by players Attack choice. { A General Body Location.})Which Row? : Location ... #(1d6 die roll. { A more Specific body location.})Which Column? : . Wound Level #(Number generated by Wounds Taken.)
== WOUND (#$Blood-Loss, #$Shock, #$Pain, $##Wound Description)
==
Sample of One Zones Data ...
ZONE:14, ARM
-
# My data is like this: # Roll, Location,
# Level One: BL, Shock, Pain, Wound Description
# Level Two: BL, Shock, Pain, Wound Description
# Level Three:... BL, Shock, Pain, Wound Description
# Level Four: BL, Shock, Pain, Wound Description
# Level Five: . BL, Shock, Pain, Wound Description
1, Hand0, 6-WP, 5-WP, Surface graze. May drop anything held in hand.0, 3, 4-WP, Some flesh (like the palm) and bruised bone. May drop at -32, 9-WP, 6-WP, Pierced hand totally. May drop handheld items (at -4)5, 7, 9-WP, Hit wrist bones (instantly drop whatever may be held in that hand)9, 8, 9-WP, As previous, a slashed artery or vein
2-3, Forearm0 5-WP 4-WP,1 5 6-WP,2 5 6-WP,6 7 8-WP,7 8 9-WP,Grazed Bone chipped (may drop handheld items)As a level two, plus you automatically drop anything heldTotally passes through, causing greater blood loss and forcing any item to be droppedAs level four, with more blood and some bone damage
4, Elbow0 6-WP 5-WP,0 4 6-WP,3 6 7-WP,5 8 9-WP,7 9 11-WP,Glancing blowSolid blow; funnybone effect. May drop items in that handTorn ligament or similar wound; instantly drop items in that handDislocated or otherwise jacked up elbow. Use of arm temporarily lostShattered elbow. Arm now useless
5-6, Upper arm0 4-WP 4-WP,1 3 5-WP,3 5 6-WP,5 6 7-WP,7 7 8-WP,Light lacerationDeeper puncture, including torn muscleSerious flesh wound, including torn tendonsMore serious damage and bleeding, including some bone damageAs level four, but with more serious bleeding (a blood vessel was hit)
.end sample ...
Thanks for any advice or help you can give me!--Steve Goodman
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Re: [Tutor] I Give Up. - Follow up post
OK see, what I was doing originally (and I found time to finally get it
partially working)
I have a configuration file that may be edited by webmaster thus
[Ports]
http = 80
https = 443
http1 = 81
smtp = 25
smtp2 = 587
(the above is a small example, it could be *anything* )
Now I have a function that takes machine, protocol, and a dictionary of
last alerts (would be empty if none)
The whole is a small multiple machine monitoring script, By the way...
The configuration file needed to be read by config parser and assign the
config name as if it were a variable, and the value along with it
I tried it by opening a file , but could find no way to do variable
variables
(In PHP, you can do something to the effect of:
name = value
name1 = value1
and then read it in as a file , which builds an array (AKA dictionary)
and then just assign thus:
foreach ($filearray as $key = $value)
{
$$key = $value
}
in python I could see no way to do so, so I ended up with configparser,
which I *finally* got working - working code below
I am still working on this , as I wanna do it in python (currently
operational in Perl , and running as a daemon, which I want this code to
do eventually)
So, the below is a working example of reading a config file in python
using configparser
Also note: I found that ConfigParser != configparser (it is case sensitive)
Just wanted to post this back in case anyone else needs to figure out
how to use configparser in python.
import ConfigParser
cfg = ConfigParser.SafeConfigParser()
cfg.read(/home/brian/pymon.cfg)
if cfg.has_section(Parameters):
myparams = cfg.items(Parameters)
for item in myparams:
parameter[item[0]] = item[1]
else:
log_error(Parameters,not found)
if cfg.has_section(Ports):
ports = cfg.items(Ports)
for port in ports:
watch_port[port[0]] = port[1]
else:
log_error(Ports,Not Found)
if cfg.has_section(Hosts):
hostnames = cfg.items(Hosts)
for hostname in hostnames:
watch_hosts[hostname[0]] = hostname[1]
else:
log_error(Hosts,Not Found)
if cfg.has_section(IP Addresses):
ips = cfg.items(IP Addresses)
for ip in ips:
watch_ips[ip[0]] = ip[1]
else:
log_error(IP Addresses,Not Found)
if cfg.has_section(Alerts):
alerts_to = cfg.items(Alerts)
else:
log_error(Hosts,Not Found)
print parameter
print watch_port
print watch_hosts
print watch_ips
print alerts_to
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Re: [Tutor] I Give Up. - Follow up post
I tried it by opening a file , but could find no way to do variable
variables
Hi Brian,
Look for the concept of dictionaries in Python. Variable variables in
languages like PHP and Perl are doable in Python, but a dictionary usually
handles such situations in a safer way.
and then read it in as a file , which builds an array (AKA dictionary)
and then just assign thus:
foreach ($filearray as $key = $value)
{
$$key = $value
}
This is not safe in Python, because the $key given could easily be the
name of something that shouldn't be treated as configuration, such as the
built-in functions. It also makes debugging a bit harder if we have
variables in a program that aren't explicitely named.
The safe way to do this is to sandbox these variables in a dictionary.
Conceptually, the pseudocode looks like:
config_options = {}
for (name, value) in the file:
config_options[name] = value
and the real code to do this doesn't look too much different.
Let's look at some of the config-reading code:
if cfg.has_section(Parameters):
myparams = cfg.items(Parameters)
for item in myparams:
parameter[item[0]] = item[1]
else:
log_error(Parameters,not found)
if cfg.has_section(Ports):
ports = cfg.items(Ports)
for port in ports:
watch_port[port[0]] = port[1]
else:
log_error(Ports,Not Found)
if cfg.has_section(Hosts):
hostnames = cfg.items(Hosts)
for hostname in hostnames:
watch_hosts[hostname[0]] = hostname[1]
else:
log_error(Hosts,Not Found)
if cfg.has_section(IP Addresses):
ips = cfg.items(IP Addresses)
for ip in ips:
watch_ips[ip[0]] = ip[1]
else:
log_error(IP Addresses,Not Found)
if cfg.has_section(Alerts):
alerts_to = cfg.items(Alerts)
else:
log_error(Hosts,Not Found)
There's a lot of repetition here. When we have the temptation to copy and
paste, try to see if a helper function can do some lifting.
In fact, there's a bug there because of the copy-and-paste. If there are
no Alerts, the system will spuriously blame Hosts. I resent being blamed
for things I don't do, and I'm sure my programs feel the same. *grin*
Here's a possible refactoring:
#
def read_config_section(section_name, output_dictionary):
if cfg.has_section(section_name)
section = cfg.items(section_name)
else:
log_error(section_name, Not Found)
for key_value in section:
output_dictionary[key_value[0]] = key_value[1]
#
Once we have this, we can then do:
read_config_section(Parameters, parameter)
read_config_section(Ports, watch_port)
...
and eliminate a lot of that repetitive code.
Does this make sense? Feel free to ask more questions.
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Re: [Tutor] I Give Up. - Follow up post
Danny Yoo wrote:
I tried it by opening a file , but could find no way to do variable
variables
Hi Brian,
Look for the concept of dictionaries in Python. Variable variables in
languages like PHP and Perl are doable in Python, but a dictionary
usually handles such situations in a safer way.
Yeah I am familiar with the concept , and it would work nicely for some
applications, but I couldnt make it work the way I need it to for this
application :)
Reason: It's more to do with the further functions in the application
that I did not paste in the follow up :)
The issue, again is that I want to call a variable by *name* , but I do
not *KNOW* what that variable's name is, exactly
For example, say I have apache running on port 80, apache-ssl on 443,
apache2 on port 81, and Caudium on port 8080 (yes I do have a machine
running not only those servers, but AOLServer, simultaneously)
If I want to configure a protocol to check, *for multiple machines* I
might do
(pseudo function)
Check_Host(machine,protocol,port,last_results)
Now, if I want to iterate over a list of machines , and check each
machine for whatever it was set for (in the config file)
I cannot obviously have a config that says
(Protocol = Port)
http = 80
http = 81
http = 8080
smtp = 25
So the config file requires http to be the first part of the string ,
followed by something to make it unique (I.E. http1, http2, http3)
Now, if I pass each value in turn to check_host, how do I tell what type
of check to make ? (Obviously if I want to get a string from a web page,
I need to SEND a GET request, but if I am checking smtp, I cannot use
that same function, SO )
I check for the base of the configuration (if http in protocol: then run
http request, else something else)
so that I can run the correct request type on the correct port , and
maintain a log, but I cannot do that as effectively if it is a
dictionary or list or even a foreach ..
As I said, I have looked at this from every angle I could see, but using
dictionary (which was my *first* choice) did not work the way I needed
it to, nor did simply reading a file to get name value pairs I needed
the name to be an actual variable name..
believe me I have tried dictionaries, Ive tried parsing the file by
other means, but the only way I could get results I needed was through
configparser
and then read it in as a file , which builds an array (AKA dictionary)
and then just assign thus:
foreach ($filearray as $key = $value)
{
$$key = $value
}
This is not safe in Python, because the $key given could easily be the
name of something that shouldn't be treated as configuration, such as
the built-in functions. It also makes debugging a bit harder if we have
variables in a program that aren't explicitely named.
Yes, I am well aware of the dangers of taking values unchecked into an
array such as this method shows (simplified).. I rarely ever use it, or
if I do, it is on *known* clean data (example, pulling config data out
of a database , reading a .ini file, etc.. not untrusted user input)
I have seen people use this method to extract POST and GET data for
example (untrusted user input) , which I find horrifying :)
The safe way to do this is to sandbox these variables in a dictionary.
Conceptually, the pseudocode looks like:
config_options = {}
for (name, value) in the file:
config_options[name] = value
and the real code to do this doesn't look too much different.
Yeah, basically you carry values in a dictionary named by keyname ,
but.. there have been situations where I need the key name as the
variable name , I.E. config_options[name] = value could become
name = value as if it was explicitly defined that way
It's difficult to grasp or even effectively explain the concept or idea,
but sometimes you need to KNOW the key name, *without* knowing the key
name :) (confused yet? hahaha)
Let's look at some of the config-reading code:
if cfg.has_section(Parameters):
myparams = cfg.items(Parameters)
for item in myparams:
parameter[item[0]] = item[1]
else:
log_error(Parameters,not found)
if cfg.has_section(Ports):
ports = cfg.items(Ports)
for port in ports:
watch_port[port[0]] = port[1]
else:
log_error(Ports,Not Found)
if cfg.has_section(Hosts):
hostnames = cfg.items(Hosts)
for hostname in hostnames:
watch_hosts[hostname[0]] = hostname[1]
else:
log_error(Hosts,Not Found)
if cfg.has_section(IP Addresses):
ips = cfg.items(IP Addresses)
for ip in ips:
watch_ips[ip[0]] = ip[1]
else:
log_error(IP Addresses,Not Found)
if cfg.has_section(Alerts):
alerts_to = cfg.items(Alerts)
else:
log_error(Hosts,Not Found)
There's a
[Tutor] Correct way to code data or parse?
Hi Everyone
*Please forgive me the repost ... I sent the first as
Html not Text Dumb, Doh!
I'm new to python and I want to write a rpg program
that is able to use the
Correct way to code data or parse? I have pages of
.PDF file Data tables copied to text files.
I check out many python boards Books with little
illumination to my problem.
I'm still not sure about what to use for this data
listing:
Lists?, Tuple? there is some expressions with a
variable(WP) in the data!
Dictionary? same as Tuple?
Text file read?
Function?, Module?, Class?
How would a Pro approch this ?
What I'v been thinking is like this:
...
Very basic Brakedown of program: (#=Number Variables,
$=String Data)
=
Which Damage Table? : ...
Type .. $(Cutting, Puncture, Bludgeon.
Three(3) Types of weapon inflicted wounds)
Zone .. #(2d6 dice roll or Number generated by
players Attack choice. { A General Body Location.})
Which Row? : Location ... #(1d6
die roll. { A more Specific body location.})
Which Column? : . Wound Level #(Number
generated by Wounds Taken.)
== WOUND (#$Blood-Loss, #$Shock, #$Pain, $##Wound
Description)
==
Sample of One Zones Data ...
ZONE: 14, ARM
-
# My data is like this:
# Roll, Location,
# Level One: BL, Shock, Pain, Wound Description
# Level Two: BL, Shock, Pain, Wound Description
# Level Three:... BL, Shock, Pain, Wound Description
# Level Four: BL, Shock, Pain, Wound Description
# Level Five: . BL, Shock, Pain, Wound Description
1, Hand
0, 6-WP, 5-WP, Surface graze. May drop anything held
in hand.
0, 3, 4-WP, Some flesh (like the palm) and bruised
bone. May drop at -3
2, 9-WP, 6-WP, Pierced hand totally. May drop handheld
items (at -4)
5, 7, 9-WP, Hit wrist bones (instantly drop whatever
may be held in that hand)
9, 8, 9-WP, As previous, a slashed artery or vein
2-3, Forearm
0 5-WP 4-WP,
1 5 6-WP,
2 5 6-WP,
6 7 8-WP,
7 8 9-WP,
Grazed
Bone chipped (may drop handheld items)
As a level two, plus you automatically drop anything
held
Totally passes through, causing greater blood loss and
forcing any item to be dropped
As level four, with more blood and some bone damage
4, Elbow
0 6-WP 5-WP,
0 4 6-WP,
3 6 7-WP,
5 8 9-WP,
7 9 11-WP,
Glancing blow
Solid blow; funnybone effect. May drop items in that
hand
Torn ligament or similar wound; instantly drop items
in that hand
Dislocated or otherwise jacked up elbow. Use of arm
temporarily lost
Shattered elbow. Arm now useless
5-6, Upper arm
0 4-WP 4-WP,
1 3 5-WP,
3 5 6-WP,
5 6 7-WP,
7 7 8-WP,
Light laceration
Deeper puncture, including torn muscle
Serious flesh wound, including torn tendons
More serious damage and bleeding, including some bone
damage
As level four, but with more serious bleeding (a blood
vessel was hit)
.end sample ...
Thanks for any advice or help you can give me!
--
Steve Goodman
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[Tutor] Two Newbile Questions: porting drawmap.c, Python as a lifetime language
Relying heavily on the newbies treated well advertisment... :^) I'm an old C programmer, which is to say (a) I am old, and (b) even when young, I somehow managed to program in old C. I have been working--for years--on creating a personal variant of drawmap.c, Fred M. Erickson's wonderful USGS-maps-to-shaded-relief-or-contour-map-renderer, and I have finally hit the wall. I have managed to make things sooo complex that the effort to learn a new language no longer seems unaffordable. I am seeking opinions from seasoned veterans on the following two questions: 1. What's involved in a port of a C program into Python? (drawmap is offered in a number of linux distributions btw.) 2. Seeing Python hailed as a good language for learning programming, how do you rate it as a lifetime language? (I can imagine that many people have settled into one language for doing the remainder of their life's work. If I am pressed, I will choose Perl at this point.) Humbly, -- David ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] I Give Up. - Follow up post
Now, if I want to iterate over a list of machines , and check each
machine for whatever it was set for (in the config file)
So the config file requires http to be the first part of the string ,
followed by something to make it unique (I.E. http1, http2, http3)
Hi Brian,
Have you considered using something other than the INI-style file format?
ConfigParser works best when there is a fixed, known set of keys: it
doesn't work so well when you want to use an arbitrary collection where
you do not know the keys in advance.
Bluntly put: it does sound like the INI file format and what you
ultimately want is not meshing well together.
Let's clarify the requirement: you want to have a mapping from services to
their configurations. Ignoring the format of the configuration file for
the moment, it sounds like you ultimately want to parse the configruation
and get:
{ 'apache' : ('http', 80),
... }
where a 'machine' is the key into the corresponding (protocol, port)
value.
If you are just prototyping this, a 'module' file like:
### machine_config.py
machines = { 'apache': ('http', 80),
## fill me in with the config of other machines
}
could be used as your configuration file format. The value portion of a
dictionary can be an arbitrary value. Here, we map a machine's name to a
tuple containing the protocol and port. No string hackery is involved
here.
believe me I have tried dictionaries, Ive tried parsing the file by
other means, but the only way I could get results I needed was through
configparser
I think you're making this problem too hard for yourself.
Yeah, basically you carry values in a dictionary named by keyname ,
but.. there have been situations where I need the key name as the
variable name , I.E. config_options[name] = value could become
name = value as if it was explicitly defined that way
Can you show us the situation you're talking about that requires this?
It's difficult to grasp or even effectively explain the concept or idea,
Try to do so. I think this is a real point that needs to be cleared up.
Agreed. however I just set this as a preliminary - in no way is this
code finished. :) I actually intended to build a function to do this.
(In perl, I use Switch/Case statements, does Python have anything
similar? - with switch/case, you can set a final default catch-all at
which point I log a unknown event message )
Take a look at:
http://www.python.org/doc/faq/general.html#why-isn-t-there-a-switch-or-case-statement-in-python
If you need more examples, ask, and someone here on the list will be happy
to help.
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Re: [Tutor] Two Newbile Questions: porting drawmap.c, Python as a lifetime language
[EMAIL PROTECTED] wrote: 1. What's involved in a port of a C program into Python? (drawmap is offered in a number of linux distributions btw.) It really (really) depends on the C program -- C's so flexible that you can write in a Pythonish style (specifically, avoiding pointer tricks, keeping OS-specific stuff to a minimum, and using good functional / data abstractions) or in a style that's so obfuscated as to make any sort of translation impossible. The flip side of that is that Python is flexible enough to accommodate many programming styles. It sounds like this program basically parses an input file and produces an output file, so I would bet that you can find some existing code that will read the input file, and some other existing code that will write the output file. Then you just have to write the middle part. 2. Seeing Python hailed as a good language for learning programming, how do you rate it as a lifetime language? (I can imagine that many people have settled into one language for doing the remainder of their life's work. If I am pressed, I will choose Perl at this point.) Eep, Perl! Once a polyglot, always a polyglot. My choice of language depends on the context. For quick web stuff, PHP (O! How I hate thee!). For quick manipulation of files and/or using lots of external programs, shell. For just about everything else, Python. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] I Give Up. - Follow up post
OK .. so far so good.. :)
ultimately want is not meshing well together.
Let's clarify the requirement: you want to have a mapping from services
to their configurations. Ignoring the format of the configuration file
for the moment, it sounds like you ultimately want to parse the
configruation and get:
### machine_config.py
machines = { 'apache': ('http', 80),
## fill me in with the config of other machines
}
could be used as your configuration file format. The value portion of a
dictionary can be an arbitrary value. Here, we map a machine's name to
a tuple containing the protocol and port. No string hackery is involved
here.
Umm well it would work nicely . *if* the configuration never changed- on
the other hand, if it is to do as intended, the user of the application
needs to be able to add and edit the configuration.
Unless they are well versed with python and/or programming and syntax,
(in which case they probably arent going to use this script anyway)
it is easier for a non programmer to edit a configuration that makes
some sort of logical sense and is easy to edit, without screwing up
(need to make it more forgiving of things like line endings, spacing
between name , = and value elements, etc)
So the ideal format is a configuration file where they can set up
(within documented settings parameters) additional machines or protocols
or ports to suit their own network or layout..
Easiest = a simple file where I set name = value and import it.
HOWEVER, if it is to be imported, it must follow proper python syntax,
correct? so if it doesnt, they break it
an INI file on the other hand is a bit more forgiving, thus the choice
to use it.
believe me I have tried dictionaries, Ive tried parsing the file by
other means, but the only way I could get results I needed was through
configparser
I think you're making this problem too hard for yourself.
perhaps, when I get back to the project I plan to do a code review of
code to date..
I have no problem with refactoring if I can find a better, momre
effective way, but it *must* also be user friendly (ease of use and
configuration for a non-programmer)
Another option I had was to do a web based interface for setting up
additional machines, etc, but web based is non-ideal for this application.
Yeah, basically you carry values in a dictionary named by keyname ,
but.. there have been situations where I need the key name as the
variable name , I.E. config_options[name] = value could become
name = value as if it was explicitly defined that way
Can you show us the situation you're talking about that requires this?
if cfg.has_section(Hosts):
hostnames = cfg.items(Hosts)
for hostname in hostnames:
watch_hosts[hostname[0]] = hostname[1]
would result in like
watch_hosts = {http : 80,https : 443}
Sure, I could also do this by reading a config file and parsing it , but ..
Say you split at the = , and the config file is like
http = 80 #standard http port
https=443#https port
Are you going to be 100% certain that when you call watch_hosts[http],
that you are gonna GET string 80?
what about the space between http and = ?
if you wanted to check if watch_hosts[keyname] == http , it would
never work, right?(because if you split at =, you have string http -
see the space char?)
if I, however use configparser, I will always get http and 80 where
I expect them to be , I dont have to worry (or send values through a
cleanup or trim() function) if it has a comment for the line or not, I
dont need to worry if there is whitespace. right?
This is intended for an end user to be able to edit a config file with a
minimum of trouble, and be able to leave comments so they remember what
each is for.. :)
(and if they do mess up somehow, I can catch that kind of thing in the
code)
I just didnt see any more effective way to get this than to use
ConfigParser as opposed to attempting to parse a file using regular
expressions , trim, split, etc
It's difficult to grasp or even effectively explain the concept or idea,
Try to do so. I think this is a real point that needs to be cleared up.
I understand the concept/idea behind it, I think above is about as good
an explanation as it gets - I tried to express how Im
thinking/approaching this issue. Keeping in mind this is going to be
edited by someone who may or may not know how to write a single line of
program code.. :)
Take a look at:
http://www.python.org/doc/faq/general.html#why-isn-t-there-a-switch-or-case-statement-in-python
Thanks. reading up on it now.
If you need more examples, ask, and someone here on the list will be
happy to help.
!DSPAM:44aae7ac185203757830825!
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Re: [Tutor] Two Newbile Questions: porting drawmap.c, Python as a lifetime language
[EMAIL PROTECTED] wrote: 2. Seeing Python hailed as a good language for learning programming, how do you rate it as a lifetime language? (I can imagine that many people have settled into one language for doing the remainder of their life's work. If I am pressed, I will choose Perl at this point.) Python is great as a general-purpose programming language and it is my language of choice today. But I'll be pretty surprised if it keeps the spot on the top of the heap for the rest of my working life... Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Two Newbile Questions: porting drawmap.c, Python as a lifetime language
Really depends on what you do, if you program for a living most probably you'll use whatever your employer tells you to use, if you work by yourself you can choose, personally i like python because of the enormous amount of modules available to do all sort of stuff, from GUI programing, to unittest, database, compression, graphics (OpenGL), etc. I like it because is crossplatform, it may not be fast but most modules are written in C already and are fast. I like the ability to use py2exe and generate a windows executable in a folder with ALL that i need to deploy on windows, i just copy the folder and i'm done. The Python comunity is very nice too, this is a big plus if you are learning a new languaje, the tutor list is always very helpful and active. You can always make use of your C skills even on Python, by writting modules to extend python functionability or to speed it up. Good Luck! Regards Carlos Daniel Ruvalcaba Valenzuela On 7/4/06, Kent Johnson [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: 2. Seeing Python hailed as a good language for learning programming, how do you rate it as a lifetime language? (I can imagine that many people have settled into one language for doing the remainder of their life's work. If I am pressed, I will choose Perl at this point.) Python is great as a general-purpose programming language and it is my language of choice today. But I'll be pretty surprised if it keeps the spot on the top of the heap for the rest of my working life... Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
