[issue4966] Improving Lib Doc Sequence Types Section
Changes by Dennis Benzinger dennis.benzin...@gmx.net: -- nosy: +dcbbcd ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4966 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3292] Position index limit; s.insert(i,x) not same as s[i:i]=[x]
Changes by Dennis Benzinger dennis.benzin...@gmx.net: -- nosy: +dcbbcd ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3292 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: url filtering
Am Sun, 17 Dec 2006 20:14:32 +0100 schrieb vertigo [EMAIL PROTECTED]: Hello I want to do some text analysis based on html documents grabbed from internet. Is there any library which could allow me easily getting text from html documents (cutting javascript, html tags and other not nececary data) ? Thanx Try Beautiful Soup: http://www.crummy.com/software/BeautifulSoup/ Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: sha, PyCrypto, SHA-256
Am 16 Dec 2006 11:17:19 -0800 schrieb [EMAIL PROTECTED]: Operating system: Win XP Vsn of Python: 2.4 Situation is this: Required to calcluate a message digest. The process for calcluating the digest must use an SHA-256 algorithm. Questions: 1) Is it correct that the sha module comes with python 2.4? 2) Is it correct that the sha module that ships with python 2.4 does NOT have the SHA-256 capability as part of the module? 3) It looks like PyCrypto is a package that, among other things, permits one to calculate a message digest using an SHA-256 algorithm...is that correct? 4) It looks like there are a couple couple possibilities available for the download...either download the source code and run the setup which (I'm assuming) compiles the various extension modules, or download the pycrypto-2.0.1.win32-py2.4.zip which extracts out to a .exe; when one runs the just-extracted .exe, it installs the stuff on one's workstation. I'm leaning toward the second option because it seems like most of the work has been done for me. A quick search on this site didn't turn up anything that suggested there were problems with running the installer. So, my question is this: are you aware of any problems running the installer? 5) Besides PyCrypto, are there any other Python packages that permit one to calculate a message digest using an SHA-256 algorithm? Thank you. Python 2.5 comes with SHA-256 in the hashlib module. So you could install Python 2.5 instead of the PyCrypto module. Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: automatically grading small programming assignments
Am Thu, 14 Dec 2006 12:27:07 -0500 schrieb Brian Blais [EMAIL PROTECTED]: Hello, I have a couple of classes where I teach introductory programming using Python. What I would love to have is for the students to go through a lot of very small programs, to learn the basic programming structure. Things like, return the maximum in a list, making lists with certain patterns, very simple string parsing, etc. Unfortunately, it takes a lot of time to grade such things by hand, so I would like to automate it as much as possible. I envision a number of possible solutions. In one solution, I provide a function template with a docstring, and they have to fill it in to past a doctest. Is there a good (and safe) way to do that online? Something like having a student post code, and the doctest returns. I'd love to allow them to submit until they get it, logging each attempt. Or perhaps there is a better way to do this sort of thing. How do others who teach Python handle this? thanks, Brian Blais Perhaps the Sphere Online Judge can help you: https://www.spoj.pl/info/ Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: How to check for instances of a class
On 14 Nov 2006 11:00:53 -0800 [EMAIL PROTECTED] wrote: Traversing a list of variables, I need to check wheter an element in the list is an instance of a (user defined) class. What cind of comparison operator can I use? Can't seem to find this in the documentation. I anyone have an example it is much appreciated. Use isinstance() http://docs.python.org/lib/built-in-funcs.html. You need something like isinstance(list_element, your_class) Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: item access time: sets v. lists
On Wed, 04 Oct 2006 16:02:56 GMT David Isaac [EMAIL PROTECTED] wrote: Is it expected for access to set elements to be much slower than access to list elements? Explanation? Thanks, Alan Isaac t1=timeit.Timer(for i in set(xrange(1)):pass,) t2=timeit.Timer(for i in list(xrange(1)):pass,) [...] You're measuring the time for creating the xrange and the set/list too. Create them before you call Timer() and repeat your timing. Dennis Benzinger -- http://mail.python.org/mailman/listinfo/python-list
strftime replacement which supports Unicode format strings?
Is there a library with a strftime replacement which supports Unicode format strings? Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie help - test for data type
Jonathan Bowlas wrote: Hi Listers, I have a requirement to test for a data type could someone tell me if this is possible in python? Basically I have a ZPT in Zope that users can select checkboxes in a form which pass arguments for a python function, however if there is only one checkbox selected it is passed as a string whereas more than one checkbox is passed as a list. Therefore if my function is required to perform an action based on each argument passed in the list the function works correctly but if it is passed as a string nothing happens. You need the isinstance() function. For example you can use isinstance(selecteddeptcodes, list) to test if your variable is a list. If you want to test the other way round use isinstance(selecteddeptcodes, str) if your variable is a string, isinstance(selecteddeptcodes, unicode) if it's a unicode string or isinstance(selecteddeptcodes, basestring) to test if it's a string or unicode string. Read more about this function and the types to test for in http://docs.python.org/lib/built-in-funcs.html. If you already have the code for a list argument I'd check if it's not a list and then turn it into a list: if not isintance(selecteddeptcodes, list): selecteddeptcodes = [selecteddeptcodes] Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Client/Server Question
[EMAIL PROTECTED] wrote: Is os.system() going to be deprecated in future ?.I read somewhere. [...] Sometime in the future it will. But that won't happen soon. Read the second paragraph of Backwards Compatibility in the subprocess PEP http://www.python.org/dev/peps/pep-0324/. Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Client/Server Question
[EMAIL PROTECTED] wrote:
My server.py looks like this
-CODE--
#!/usr/bin/env python
import socket
import sys
import os
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ''
port = 2000
s.bind((host,port))
s.listen(1)
conn, addr = s.accept()
print 'client is at', addr
while True:
data = conn.recv(100)
if (data == 'MaxSim'):
print 'MaxiSim'
os.system('notepad')
elif (data == 'Driving Sim'):
print 'Driving Sim'
os.system('explorer')
elif (data == 'SHUTDOWN'):
print 'Shutting down...'
os.system('shutdown -s')
conn.close()
break
---CODE
END-
I am running this above program on a windows machine. My client is a
Linux box. What I want to achieve is that server.py should follows
instructions till I send a 'SHUTDOWN' command upon which it should shut
down.
When I run this program and suppose send 'MaxSim' to it, it launches
notepad.exe fine, but then after that it doesn't accept subsequent
command. I want is that it should accept subsequent commands like
Driving Sim and launch windows explorer etc untill I send a 'SHUTDOWN'
command.
Any help on this, it will be greatly appreciated.
os.system() blocks until the called program has finished. Use the
subprocess module http://docs.python.org/lib/module-subprocess.html:
untested_code
import subprocess
subprocess.Popen(notepad)
/untested_code
Dennis
--
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Re: change the size of front
aliassaf wrote:
hi,
I want to change the size of the front in a legend, i wrote this small
program and it got to me this message error!!!
from pylab import *
plot([1,2,3],'r')
legend('this',prop = FontProperties('smaller') )
Try
legend('this',prop = matplotlib.font_manager.FontProperties(size =
'smaller'))
show()
NameError: name 'FontProperties' is not defined
thanks
Dennis
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Re: Finding Return Code From GPG
Nomen Nescio wrote: I'm running gpg in python to verify a signature. I can see that it is working, because gpg is displaying the results. But I need a way to let the python script know this. According to the gpg manual there is a return code from gpg of 0 if the verify is good and 1 if it is bad. Can anyone tell me how I can get the python script to 'see' this return code? How do you run GPG? I suggest using the subprocess module http://docs.python.org/lib/module-subprocess.html. If you just need something simple then you can use its call function http://docs.python.org/lib/node236.html. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with sets and Unicode strings
Diez B. Roggisch wrote: But I'd say that it's not intuitive that for sets x in y can be false (without raising an exception!) while the doing the same with a tuple raises an exception. Where is this difference documented? 2.3.7 Set Types -- set, frozenset ... Set elements are like dictionary keys; they need to define both __hash__ and __eq__ methods. ... And it has to hold that a == b = hash(a) == hash(b) but NOT hash(a) == hash(b) = a == b Thus if the hashes vary, the set doesn't bother to actually compare the values. [...] Ok, I understand. But isn't it a (minor) problem that using a set like this: # -*- coding: UTF-8 -*- FIELDS_SET = set((Fächer, )) print uFächer in FIELDS_SET print uFächer == Fächer shadows the error of not setting sys.defaultencoding()? Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with sets and Unicode strings
Robert Kern wrote: Dennis Benzinger wrote: Ok, I understand. But isn't it a (minor) problem that using a set like this: # -*- coding: UTF-8 -*- FIELDS_SET = set((Fächer, )) print uFächer in FIELDS_SET print uFächer == Fächer shadows the error of not setting sys.defaultencoding()? You can't set the default encoding. If you could, then scripts that run on your machine wouldn't run on mine. [...] As Serge Orlov wrote in one of his posts you _can_ set the default encoding (at least in site.py). See http://docs.python.org/lib/module-sys.html Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with sets and Unicode strings
Serge Orlov wrote: On 6/27/06, Dennis Benzinger [EMAIL PROTECTED] wrote: Serge Orlov wrote: On 6/27/06, Dennis Benzinger [EMAIL PROTECTED] wrote: Hi! The following program in an UTF-8 encoded file: # -*- coding: UTF-8 -*- FIELDS = (Fächer, ) FROZEN_FIELDS = frozenset(FIELDS) FIELDS_SET = set(FIELDS) print uFächer in FROZEN_FIELDS print uFächer in FIELDS_SET print uFächer in FIELDS gives this output False False Traceback (most recent call last): File test.py, line 9, in ? print uFÀcher in FIELDS UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: ordinal not in range(128) Why do the first two print statements succeed and the third one fails with an exception? Actually all three statements fail to produce correct result. So this is a bug in Python? No. frozenset remove the exception? Because sets use hash algorithm to find matches, whereas the last statement directly compares a unicode string with a byte string. Byte strings can only contain ascii characters, that's why python raises an exception. The problem is very easy to fix: use unicode strings for all non-ascii strings. No, byte strings contain characters which are at least 8-bit wide http://docs.python.org/ref/types.html. Yes, but later it's written that non-ascii characters do not have universal meaning assigned to them. In other words if you put byte 0xE4 into a bytes string all python knows about it is that it's *some* character. If you put character U+00E4 into a unicode string python knows it's a latin small letter a with diaeresis. Trying to compare *some* character with a specific character is obviously undefined. [...] But http://docs.python.org/ref/comparisons.html says: Strings are compared lexicographically using the numeric equivalents (the result of the built-in function ord()) of their characters. Unicode and 8-bit strings are fully interoperable in this behavior. Doesn't this mean that Unicode and 8-bit strings can be compared and this comparison is well defined? (even if it's is not meaningful) Thanks for your anwsers, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with sets and Unicode strings
Robert Kern wrote: Dennis Benzinger wrote: Serge Orlov wrote: On 6/27/06, Dennis Benzinger [EMAIL PROTECTED] wrote: Hi! The following program in an UTF-8 encoded file: # -*- coding: UTF-8 -*- FIELDS = (Fächer, ) FROZEN_FIELDS = frozenset(FIELDS) FIELDS_SET = set(FIELDS) print uFächer in FROZEN_FIELDS print uFächer in FIELDS_SET print uFächer in FIELDS gives this output False False Traceback (most recent call last): File test.py, line 9, in ? print uFÀcher in FIELDS UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: ordinal not in range(128) Why do the first two print statements succeed and the third one fails with an exception? Actually all three statements fail to produce correct result. So this is a bug in Python? No. [...] But I'd say that it's not intuitive that for sets x in y can be false (without raising an exception!) while the doing the same with a tuple raises an exception. Where is this difference documented? Thanks, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Problem with sets and Unicode strings
Hi! The following program in an UTF-8 encoded file: # -*- coding: UTF-8 -*- FIELDS = (Fächer, ) FROZEN_FIELDS = frozenset(FIELDS) FIELDS_SET = set(FIELDS) print uFächer in FROZEN_FIELDS print uFächer in FIELDS_SET print uFächer in FIELDS gives this output False False Traceback (most recent call last): File test.py, line 9, in ? print uFÀcher in FIELDS UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: ordinal not in range(128) Why do the first two print statements succeed and the third one fails with an exception? Why does the use of set/frozenset remove the exception? Thanks, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Python UTF-8 and codecs
Mike Currie wrote:
I'm trying to write out files that have utf-8 characters 0x85 and 0x08 in
them. Every configuration I try I get a UnicodeError: ascii codec can't
decode byte 0x85 in position 255: oridinal not in range(128)
I've tried using the codecs.open('foo.txt', 'rU', 'utf-8', errors='strict')
and that doesn't work
[...]
You want to write to a file but you used the 'rU' mode. This should be
'wU'. Don't know if this is the only reason it doesn't work. Could you
show more of your code?
Bye,
Dennis
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Re: Problem with sets and Unicode strings
Serge Orlov wrote: On 6/27/06, Dennis Benzinger [EMAIL PROTECTED] wrote: Hi! The following program in an UTF-8 encoded file: # -*- coding: UTF-8 -*- FIELDS = (Fächer, ) FROZEN_FIELDS = frozenset(FIELDS) FIELDS_SET = set(FIELDS) print uFächer in FROZEN_FIELDS print uFächer in FIELDS_SET print uFächer in FIELDS gives this output False False Traceback (most recent call last): File test.py, line 9, in ? print uFÀcher in FIELDS UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: ordinal not in range(128) Why do the first two print statements succeed and the third one fails with an exception? Actually all three statements fail to produce correct result. So this is a bug in Python? frozenset remove the exception? Because sets use hash algorithm to find matches, whereas the last statement directly compares a unicode string with a byte string. Byte strings can only contain ascii characters, that's why python raises an exception. The problem is very easy to fix: use unicode strings for all non-ascii strings. No, byte strings contain characters which are at least 8-bit wide http://docs.python.org/ref/types.html. But I don't understand what Python is trying to decode and why the exception says something about the ASCII codec, because my file is encoded with UTF-8. Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Python with Eclipse
Philippe Martin wrote: Dennis Benzinger wrote: Stan Cook wrote: I've been trying to use Eclipse with Python on Linux for a while and have noticed something odd. After running the code or debugging a few times, its responsiveness gets really bad. Upon checking the equivalent of the task manager, I find several instances of Python running. When I kill these instances, the responsiveness comes back. I'm not sure if there is a better place to post this, but it is Python related. Is this just an issue with Eclipse or is there something else I should inspect? Any help would be appreciated. Regards, S Cook Which Python plugin are you using? PyDev? Bye, Dennis Hi, What other plugins are there ? Regards, Philippe In the Python wiki there is a page about Eclipse plugins for Python: http://wiki.python.org/moin/EclipsePythonIntegration Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Python with Eclipse
Stan Cook wrote: I've been trying to use Eclipse with Python on Linux for a while and have noticed something odd. After running the code or debugging a few times, its responsiveness gets really bad. Upon checking the equivalent of the task manager, I find several instances of Python running. When I kill these instances, the responsiveness comes back. I'm not sure if there is a better place to post this, but it is Python related. Is this just an issue with Eclipse or is there something else I should inspect? Any help would be appreciated. Regards, S Cook Which Python plugin are you using? PyDev? Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: tracking dependencies
Michele Simionato wrote: I have a big framework (not written by me) with lots of internal dependencies and I am looking for a tool to see the dependency tree. I.e. given a module x, it should show me all the modules imported by x, and the modules imported by them recursively. Standard library modules should be ignored and there should be an option to turns off the visualization of certain modules, for instance the ones in given subpackages. I guess somebody has already written it, maybe even with a nice visual backend. Any hint? Michele Simionato I've never tried it, but http://www.tarind.com/depgraph.html looks like what you are looking for. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I automatically redirect stdout and stderr when using os.popen2?
[EMAIL PROTECTED] wrote: How do I automatically redirect stdout and stderr when using os.popen2 to start a long running process. If the process prints a lot of stuff to stdout it will eventually stop because it runs out of buffer space. Once I start reading the stdout file returned by os.popen2 then the process resumes. I know that I could just specify /dev/null when starting the process but I'd like to know if there is a way to start a process using os.popen2 or some other way so that all standard out and standard error goes to /dev/null or some other file. Thanks, Mike Use the POpen class http://docs.python.org/lib/node235.html from the subprocess module. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: creating and naming objects
Brian wrote: [...] For example, lets say that I have a class that creates a student object. Class Student: def setName(self, name) self.name = name def setId(self, id) self.id = id Then I instantiate that object in a method: def createStudent(): foo = Student() /add stuff Now, suppose that I want to create another Student. Do I need to name that Student something other than foo? What happens to the original object? If I do not supplant the original data of Student (maybe no id for this student) does it retain the data of the previous Student object that was not altered? I guess I am asking how do I differentiate between objects when I do not know how many I need to create and do not want to hard code names like Student1, Student2 etc. [...] Just return your Student object from createStudent() and put it in a list. For example: all_students = [] for i in range(10): one_student = createStudent() # Do what you want with one_student here all_students.append(one_student) print all_students BTW: Why don't you use a constructor to create Student objects? Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: in python , could I accomplish the purpose that a=Console.read() used in C?
python wrote: in python , could I accomplish the purpose that a=Console.read() used in C? when program is running, I wanna add a statement like a=Console.read() in C language,it will wait for user's input, after user's typing a character , and click enter key, the program will go on running. Use raw_input() http://docs.python.org/lib/built-in-funcs.html: age = raw_input(Your age: ) print age Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Using pysqlite2
[EMAIL PROTECTED] wrote: Is it possible to use this for sending triggers to a sqlite db?Could someone provide me with an example of how to do this please? Thanks Do you want to implement a trigger for a SQLite database in Python? That won't work. Triggers in SQLite can only contain UPDATE, INSERT, DELETE and SELECT statements http://sqlite.org/lang_createtrigger.html. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Class probkem - getting msg that self not defined
wes weston schrieb: Andrew Robert wrote: wes weston wrote: Andrew Robert wrote: Hi Everyone, I am having a problem with a class and hope you can help. When I try to use the class listed below, I get the statement that self is not defined. test=TriggerMessage(data) self is not known here; only inside the class. var = test.decode(self.qname) snip I guess I was barking up the wrong tree on that one. How would I go about getting the required values out of the class? Return self? You can refer to the variables inside the class as test.version; for example - as they are not protected. Or, you could add access methods in the class like def GetVersion(self): return self.version If you want to protect version, call it self.__version which mangles the name from outside. wes Or use the property function to define properties http://docs.python.org/lib/built-in-funcs.html. Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: File encoding strategy question
Andrew Robert schrieb: Hi everyone, I am in the process of creating a file transmit/receiver program using MQSeries. The way it works is through creation of an XML message. Elements within the XML message contain things such as file name, size, and the file contents. The file contents are encoded, currently using Base64, for support of both binary and text data. This works great but there is a small rub to the problem. I would like to be able to view the contents of the file if it is text while still maintaining the ability to transmit binary data. Does anyone know of an encoding format that would make this possible? [...] Yes. You could use the Quoted-Printable encoding. See RFC 2045 Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies ftp://ftp.rfc-editor.org/in-notes/rfc2045.txt Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: escapes in regular expressions
James Thiele schrieb:
I was helping a guy at work with regular expressions and found
something I didn't expect:
re.match('\d', '7').group()
'7'
'\d' is not recognized as a escape sequence by Python and therefore it
is left unchanged http://docs.python.org/ref/strings.html in the
string which is passed to re.match.
re.match('\\d', '7').group()
'7'
[...]
This is the correct version. The first backslash escapes the second one
and this version will work even if a future version of Python recognizes
\d as an escape sequence.
Dennis
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Update Demo/ and Tools/ directories
Hi! I'd like to help with updating the Demo/ and Tools/ directories as it is suggested in the Python Wiki http://wiki.python.org/moin/SimpleTodo. How exactly should the directories be updated? Should it just be made sure that the demos and examples are working or should they be updated to use the newest applicable Python features (e.g. the new any/all functions)? Dennis -- http://mail.python.org/mailman/listinfo/python-list
Outdated Python Info on www.unicode.org
The Unicode Consortium has a page about Unicode Enabled Products http://www.unicode.org/onlinedat/products.html. This page contains some really outdated information about Python (like Python 2.3 will come out in a few months). Could someone who knows the current state of Unicode support in Python update this information? Thanks, Dennis Benzinger -- http://mail.python.org/mailman/listinfo/python-list
Re: apache mod_python problem
Ido Yehieli schrieb: [...] Anyone has any idea as to what went wrong? [...] If you compiled mod_python as a Dynamic Shared Object (DSO) you have to tell Apache to load that module. For example like this: LoadModule python_module libexec/mod_python.so See the mod_python documentation, especially the Configuring Apache section: http://modpython.org/live/current/doc-html/inst-apacheconfig.html Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Strange behavior with os call in cgi script
sophie_newbie schrieb: I have written a cgi script that seems to run perfectly from the command line when I simulate some cgi input using os.environ['QUERY_STRING']. The thing is that when I run it from the browser, one of my os.system calls, which gets excecuted fine when running the program in the interpreter, doesn't seem to get excecuted, or gets excecuted but does nothing. Does anyone know whats going on or how I could debug this problem? [...] Probably the environment is different when your program is executed by your web server. So either PATH is wrong and your program is not found or some other environment variable is wrong and you could debug it by printing the environment in your program. -- http://mail.python.org/mailman/listinfo/python-list
Re: Most prominent Tkinter applications?
Kevin Walzer schrieb: I'm looking for examples of best practices in Tkinter/Python programming. What are the most prominent Python applications out there that use Tkinter as the GUI toolkit? These can be commercial or open-source, but are preferably multi-platform. I know IDLE is written in Tkinter, so that's one example. Can anyone direct me to others? Leo http://webpages.charter.net/edreamleo/front.html, an outlining editor, uses Tkinter. It's at least as prominent as IDLE ;-) Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and XML Schema
Trond wrote: I have a need to, given a XML document with XML Schema defined, to get the type of each element in the XML file based on the XML Schema URI given. IE, the title element is of simple datatype string. Is there any existing Python libraries were I can parse the XML file, and for a given node ask for the datatype (which should be taken from XML Schema?) [...] Take a look at lxml. It's a pythonic binding for libxml2 and libxslt. libxml2 http://xmlsoft.org/ implements XML Schema Part 2: Datatypes and partially XML Schema Part 1: Structures. I don't know how complete the structures implementation is and if it can already do what you want. So you might ask the libxml2 guys how to do what you want with libxml2 and then use lxml to do it in Python. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: how to test for a dependency
Darren Dale schrieb:
Hello,
I would like to test that latex is installed on a windows, mac or linux
machine. What is the best way to do this? This should work:
if os.system('latex -v'):
print 'please install latex'
but I dont actually want the latex version information to print to screen. I
tried redirecting sys.stdout to a file, but that doesnt help. Is there a
better way to do this in a cross-platform friendly way?
Thanks,
Darren
I didn't try it, but you could use the subprocess module
http://python.org/doc/2.4.2/lib/module-subprocess.html.
Create a Popen object with stdout = PIPE so that a pipe to the child
process is created and connected to the client's stdout.
Bye,
Dennis
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Re: Which package to choose?
ankit schrieb: Hi pupil, please let me know which package to choose for xml processing in python . Here are my requirements I want a package which provides me schema support along with minidom support. According to my findings, libxml2 provides schema support but it needs either libxml2 or libgdome2 for minidom support. But these pacakges are not well tested exp libxml2dom. Also, libxml2 is not so much pythonic i,e more based and used with C. So there is lack of documentation for that and I am new to that. I need proper documentation [...] lxml http://codespeak.net/lxml/ may be what you are looking for. It's a pythonic binding for libxml2 and libxslt. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the type of an object?
Licheng Fang schrieb:
I wrote a function with a list as its parameter. And the function has
to perform different operations based on the datatypes of the elements.
How can I decide whether an object is, say, a list or a string?
Thanks.
To check if an object is of a particular type use isinstance(), to get
the type of an object use type(). You can read more about this two
function in the built-in functions documentation
http://www.python.org/doc/2.4.2/lib/built-in-funcs.html. The types
module http://www.python.org/doc/2.4.2/lib/module-types.html may also
help you.
Small example:
a_list = [1, two, [3], (4,), {5: 5}]
for item in a_list:
if isinstance(item, list):
print It's a list
else:
print type(item)
Bye,
Dennis
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Re: Newbie needs help with regex strings
Catalina Scott A Contr AFCA/EVEO schrieb:
I have a file with lines in the following format.
pie=apple,quantity=1,cooked=yes,ingredients='sugar and cinnamon'
Pie=peach,quantity=2,ingredients='peaches,powdered sugar'
Pie=cherry,quantity=3,cooked=no,price=5,ingredients='cherries and sugar'
I would like to pull out some of the values and write them to a csv
file.
For line in filea
pie = regex
quantity = regex
cooked = regex
ingredients = regex
fileb.write (quantity,pie,cooked,ingredients)
How can I retreive the values and assign them to a name?
Thank you
Scott
Try this:
import re
import StringIO
filea_string = pie=apple,quantity=1,cooked=yes,ingredients='sugar and
cinnamon'
pie=peach,quantity=2,ingredients='peaches,powdered sugar'
pie=cherry,quantity=3,cooked=no,price=5,ingredients='cherries and sugar'
FIELDS = (pie, quantity, cooked, ingredients, price)
field_regexes = {}
for field in FIELDS:
field_regexes[field] = re.compile(%s=([^,\n]*) % field)
for line in StringIO.StringIO(filea_string):
field_values = {}
for field in FIELDS:
match_object = field_regexes[field].search(line)
if match_object is not None:
field_values[field] = match_object.group(1)
print field_values
#fileb.write (quantity,pie,cooked,ingredients)
Bye,
Dennis
--
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Re: Newbie needs help with regex strings
Christopher Subich schrieb: Paul McGuire wrote: [...] For the example listed, pyparsing is even overkill; the OP should probably use the csv module. But the OP wants to parse lines with key=value pairs, not simply lines with comma separated values. Using the csv module will just separate the key=value pairs and you would still have to take them apart. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: to write set of values to a file from python
[EMAIL PROTECTED] schrieb: hi everybody i want to write a set of values to a file from python. For ex:: the fields name will comp name, ip addr, mac addr etc. And below all these fields i ll have the values for these fields. it should look some what like this. comp name ipaddr macaddr jdasfhjashd 234.347.23.12 334.12.354.43.232 dfdsfusdaufisa 234.533.45.1289.234.234.2343 sfdidsfoui 234.45.23.56 89.343.23.45.233 something like thiss. so which is the best way to do this. I mean which file format would be the best to choose , to dump all these values from my python script. Will it be a .ini file format? or .xls or .txt which will be the better one. so that later it will be easy for me to read this file. thanks in advance for the help regards yogi I would use a comma separated values (CSV) file. Have a look at the csv module http://www.python.org/doc/2.4.2/lib/module-csv.html. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Python newbie needs help
Ron Hudson schrieb:
[...]
I have a .py file with some def scripts(?) in it.
def is the begining of a function definition.
[...]
I am using Import to read it after I start an interactive python.
What I need
right now is I seem to have some sort of scoping problems with the
world dictionary.
I can read it and write it and worldcr lists it out. but my def
look(at): script
it seems it doesn't see the the world dictionary.
import lets
world = lets.loadworld()
world
{'wizarddescription':'A short guy wearing a robe and a pointy hat'}
lets.look('wizard')
file stdin line ?
file lets.py line 14 in look
print world[at+'description']
nameError:world
at = 'wizard'
print world[at+'description']
A short guy wearing a robe and a pointy hat
Is there a way to make 'world' global? can I do it in lets.py?
Am I going about this all wrong?
[...]
The easiest solution for you would be a world variable in your lets
module. Then at the interactive prompt you could refer to it with
lets.world. So the loadworld function in lets.py would look like this:
def loadworld():
# Your loading code
global world
world = ...
Bye,
Dennis
--
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Re: set random.choice question
[EMAIL PROTECTED] schrieb: I want to do something like this: from random import choice x = set((jenny, jacqui, claire, chris, tracy)) somebody = random.choice(x) but I bet a TypeError: unindexable object error. Any suggestions for an elegant workaround? I'm using set because I want to know that I have a collection of unique objects. steve import random x = set((jenny, jacqui, claire, chris, tracy)) def draw_from_set(a_set): random_index = random.randint(0, len(x) - 1) for i, name in enumerate(x): if i == random_index: return name somebody = draw_from_set(x) print somebody Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: to write set of values to a file from python
[EMAIL PROTECTED] schrieb: [...] its printing each character in a seperate row where as i wanteach string in a seperate column? so how can i do that?? Any help for this. [...] Could you post your code here? Or explain what you did exactly. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
SVG rendering with Python
Hi! Does anybody know of a SVG rendering library for Python? Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: How To Read Excel Files In Python?
Anand schrieb: Hello, Can I get some help on how to read the excel files using python? [...] Besides using the Excel component you could use the pyExcelerator http://sourceforge.net/projects/pyexcelerator module. You even don't need Windows for it. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Python web publishing framework like Cocoon?
Hi! Is there a Python web publishing framework like Cocoon? I found Maki http://maki.sourceforge.net/ but it was last updated in 2003 and its author says that he doesn't want to make another release... Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: XMLSchema Parsing
km schrieb: Hi all, i'd like to know if there are any good XMLSchema (.xsd files) parsing modules in python. regards, KM Try lxml http://codespeak.net/lxml/ a pythonic binding for the libxml2 and libxslt libraries. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: newbie question concerning formatted output
Thomas Liesner schrieb: [...] i am having some hard time to format the output of my small script. I am opening a file which containes just a very long string of hexdata seperated by spaces. Using split() i can split this string into single words and print them on stdout. So far so good. But i want to print always three of them in a single line and after that a linebreak. [...] words = [3905, 3009, , 4508, f504, , 3707, 5a07, , ] VALUES_PER_LINE = 3 # Simple version for index, word in enumerate(words): print word, # Trailing comma to suppress newline if (index + 1) % VALUES_PER_LINE == 0: print print print # Trickier version ranges =[] for i in range(VALUES_PER_LINE): ranges.append(words[i::VALUES_PER_LINE]) for triple in map(None, *ranges): print .join(str(value) for value in triple if value is not None) Hmm, the second solution seems to be a bit too tricky... Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: the first element in the list of list
Ben Bush schrieb: I have a lis: [[1,3],[3,4],[5,6],[8,9],[14,0],[15,8]] I want a code to test when the difference between the first element in the list of list is equal to or larger than 6, then move the previous lists to the end of the list. that is: [[14,0],[15,8],[1,3],[3,4],[5,6],[8,9]] your_list = [[1,3],[3,4],[5,6],[8,9],[14,0],[15,8]] for index, sublist in enumerate(your_list): if abs(sublist[1] - sublist[0]) 6: your_list = your_list[index:] + your_list[:index] break print your_list Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: path module / class
[EMAIL PROTECTED] schrieb: [...] What is the status of the path module/class PEP? Did somebody start writing one, or did it die? I didn't find one at the PEP index http://python.org/peps/, so I assume that nobody wrote or submitted one. I would really like to see something like Jason Orendorff's path class make its way into the python standard library. [...] If you think having such a class in the standard library is that important then you should write a PEP by yourself... Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: parse data
py schrieb: I have some data (in a string) such as person number 1 Name: bob Age: 50 person number 2 Name: jim Age: 39 ...all that is stored in a string. I need to pull out the names of the different people and put them in a list or something. Any suggestions...besides doing data.index(name)...over and over? thanks! Use the re module: import re your_data = person number 1 Name: bob Age: 50 person number 2 Name: jim Age: 39 names = [] for match in re.finditer(Name:(.*), your_data): names.append(match.group(1)) print names Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: any python module to calculate sin, cos, arctan?
Shi Mu schrieb: any python module to calculate sin, cos, arctan? Yes. Use the math module or the cmath module if you need mathematical functions for complex numbers. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Documentation for iteration in mappings
Hi!
I must be blind because I didn't find anything in the documentation
which says iterating over an dictionary iterates over its keys.
For example
a_dictionary = {0: zero, 1: one}
for x in a:
print x
gives you
0
1
Where is this information hidden? :)
Bye,
Dennis
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Re: Math markup in code documentation?
[EMAIL PROTECTED] schrieb: Done any one have a way (and examples) of how to do math markups in the docstrings of function and class definitions such that the equations get typeset in the generated html documentation? I'll take any markup system that'll do the job... MathML or LaTeX possible? [...] Try Doxygen: http://www.doxygen.org Examples of formulas are here: http://www.stack.nl/~dimitri/doxygen/formulas.html Doxygen has the advantage that you can use it for a variety of programming languages. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: command line argument passing
Hayri ERDENER schrieb: hi to all, is it possible in python to pass arguments by using command prompt in windows 2000 and XP ? for example: sourceCode.py factorial 4 gives me the factorial of 4 namely 24. best regards import sys print sys.argv Or use the optparse module. Docs: http://www.python.org/doc/2.4.1/lib/module-optparse.html Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Self-modifying Code
[EMAIL PROTECTED] schrieb: [...] Also Python can (writing and running a module, in-line): fNew =open(newModule.py,'w') lNew=['print 123\n','print 454\n','print 789\n'] fNew.writelines(lNew) fNew.close() from newModule import * [...] You don't even need a file for this. Try: exec(print 123; print 456; print 789) Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: RE Engine error with sub()
Maurice LING schrieb: Hi, I have the following codes: from __future__ import nested_scopes [...] Are you still using Python 2.1? In every later version you don't need the from __future__ import nested_scopes line. So, if you are using Python 2.1 I strongly recommend upgrading to Python 2.4.1. [...] It all works well for rule count up to 800+ but when my replacement rules swells up to 1800+, it gives me a runtime error that says Internal error in regular expression engine... traceable to return self.regex.sub(self, text) in substitute() method. [...] I didn't read your code, but this sounds like you have a problem with the regular expression engine being recursive in Python versions 2.4. Try again using Python 2.4 or later (i.e. Python 2.4.1). The new regular expression engine is not recursive anymore. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: build flow? SCons? AAP? process creation?
[EMAIL PROTECTED] schrieb: [...] So if I do wind up having to write this thing myself, I've been checking the docs on process creation, and have a couple questions if anyone can fill me in. It looks like the os.spawn* commands can start nonblocking sub-processes, but there doesn't seem to be a way to get stdout and stderr. On the other hand, the popen commands make it easy to trap stdout and stderr, but I guess I'd have to do the thread setup and spawning myself. Is there another alternative that I'm missing here? [...] Yes, you are missing the subprocess module which was introduced in Python 2.4: http://docs.python.org/lib/module-subprocess.html Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Whats up with re module vs pre
pythonUser_07 wrote: This is a very generic observation as I don't have a lot of specifics with me right now. I have noticed over the past two years that the python re module is somewhat unreliable. What do you mean with unreliable? Can you show an example where re does not work as expected? At the suggestion of someone quite some time ago, I started to use the deprecated pre module. import pre as re. All my problems went away. So here I am two years later, writing another script and I had forgotten about pre and wallah $ python proc.py Traceback (most recent call last): File proc.py, line 39, in ? c = collect(nohup.out) File proc.py, line 20, in collect m = p.search(cont) RuntimeError: maximum recursion limit exceeded As soon as I switched import re to import pre as re my program worked as expected. In the words of Jerry Sienfeld, what's up with that? Try again with Python 2.4. The re module is now non-recursive (http://www.python.org/2.4/highlights.html), so you shouldn't get any maximum recursion limit exceeded errors. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: Multiple initialization methods?
alex wrote: Hi, it is possible to define multiple initialization methods so that the method is used that fits? No, there is no overloading in Python. I am thinking of something like this: def __init__(self, par1, par2): self.init(par1, par2); def __init__(self, par1): self.init(par1, None) def init(self, par1, par2): ... ... So if the call is with one parameter only the second class is executed (calling the 'init' method with the second parameter set to 'None' or whatever. But this example does not work. How to get it work? Alex Use a default argument for par2 and check for that in your function: def __init__(self, par1, par2=None): # do something with par1 if par2 is None: print par2 was not given! else: print par2 is, par2 Read more in the FAQ: http://www.python.org/doc/faq/programming.html#how-can-i-overload-constructors-or-methods-in-python or in the tutorial: http://docs.python.org/tut/node6.html#SECTION00671 Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: pyclbr
Fernando San Martn Woerner wrote: Hi guys! i'm using pycblr to implement a class browser for my app, i got some issues about it: i did: dict = pyclbr.readmodule(name, [dir] + sys.path) Don't use dict (or the name of any other built-in function) as an identifier! It shadows the built-in function and can be quite confusing for others reading your code. It's sufficient to give only [dir] as the second parameter. sys.path is always searched. (http://docs.python.org/lib/module-pyclbr.html) but this only works one time, i mean if module name is changed and some class were added or removed i can't see any changes even if i execute readmodule again. any idea?, thanks in advance pyclbr caches modules it has already read. I think there is no method for clearing that cache, so you have to reload(pyclbr) in order to see your changes. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb - Tuples
Lajos Kuljo wrote:
Hallo,
ich bin voll neu im Python-Programming, deshalb ist mein Problem
wahrscheinlich trivial:
Wenn ich die Script
#33
#! /usr/bin/env python
import MySQLdb
db=MySQLdb.connect(host='localhost', db='photum_0_6_2', user='root',
passwd='thkhgfgd')
c=db.cursor()
c.execute('select person from persons order by person')
tup=c.fetchall()
for a in tup:
print a
ausführe, erhalte ich Dinge wie
('Dieter',)
('Hulda',)
Ich brauche die Klammern, Apostrphe und Kommas nicht (ich will nur die
Inhalte) und kann ich sie nicht loswerden. Versucht habe ich u. a. print
a[2:-3] was nur zwei Klammern bringt.
b=lstrip(a, () haut auch nicht hin.
Weiss jemand Rat?
Hab gerade kein MySQL da, aber änder mal
for a in tup:
print a
in
for a in tup:
print a[0] # Das erste Element des Tupels
Dann wird statt des ganzen Tupels nur das erste Element ausgegeben.
P.S. Woher kommen diese Klammern und Apostrophen, vom MySQLdb?
Die Klammern und Apostrophe kommen daher, dass tup ein Tupel
(http://docs.python.org/lib/typesseq.html) mit einem Element
(der Person) ist.
Dennis
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Re: String Fomat Conversion
mcg wrote: Investigating python day 1: Data in file: x y 1 2 3 4 5 6 Want to read file into an array of pairs. in c: scanf(%d %d,x,y)---store x y in array, loop. How do I do this in python?? In the actual application, the pairs are floating pt i.e. -1.003 Either do what the other posters wrote, or if you really like scanf try the following Python module: Scanf --- a pure Python scanf-like module http://hkn.eecs.berkeley.edu/~dyoo/python/scanf/ Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: module for 'po' files
Sara Fwd wrote: Hi all Is there a module for processing handling '.po' files in python? [...] I don't know if there is a module for processing them, but Python comes with msgfmt.py (in Tools/i18n) which creates .mo files out of your .po files. So read the source and see if there's something in there which you can use! Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: string.atoi and string.atol broken?
Mike Moum wrote:
I think there may be a bug in string.atoi and string.atol. Here's some
output from idle.
Python 2.3.4 (#2, Jan 5 2005, 08:24:51)
[GCC 3.3.5 (Debian 1:3.3.5-5)] on linux2
Type copyright, credits or license() for more information.
Personal firewall software may warn about the connection IDLE
makes to its subprocess using this computer's internal loopback
interface. This connection is not visible on any external
interface and no data is sent to or received from the Internet.
IDLE 1.0.4
import string as s
s.atoi('2',3)
2
s.atoi('4',3)
Traceback (most recent call last):
File pyshell#2, line 1, in -toplevel-
s.atoi('4',3)
File /usr/lib/python2.3/string.py, line 220, in atoi
return _int(s, base)
ValueError: invalid literal for int(): 4
s.atoi('12',11)
13
s.atoi('13',4)
7
s.atoi('12',4)
6
s.atoi('8',4)
Traceback (most recent call last):
File pyshell#6, line 1, in -toplevel-
s.atoi('8',4)
File /usr/lib/python2.3/string.py, line 220, in atoi
return _int(s, base)
ValueError: invalid literal for int(): 8
s.atoi('4',3) should result in 11
s.atoi('13',4) should result in 31
s.atoi('12',4) should result in 30
s.atoi('8',4) is legitimate, but it generates an error.
Is this a bug, or am I missing something obvious?
[...]
That's not a bug, you'r missing something obvious.
The second parameter of string.atoi (or the int builtin)
is the base (or radix) in which the number you want to
convert is given.
For example string.atoi(777, 8) results in 511,
because 7 * 8**2 + 7 * 8**1 + 7 * 8**0 = 511.
Just out of curiosty:
What did you think what atoi does?
I don't understand how you came to expect that atoi('4',3)
should result in 11.
Bye,
Dennis
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Re: Newbie question - default values of a function
Bulba! wrote: [...] But why the following happens? def j(a,i=0): ... i=i+1 ... return (a, i) ... j(2) (2, 1) j(3) (3, 1) j(5) (5, 1) From Language Reference: http://www.python.org/doc/2.3.4/ref/function.html Default parameter values are evaluated when the function definition is executed. This means that the expression is evaluated once, when the function is defined, and that that same ``pre-computed'' value is used for each call. This is especially important to understand when a default parameter is a mutable object, such as a list or a dictionary: if the function modifies the object (e.g. by appending an item to a list), the default value is in effect modified. Surely the variable i is a mutable object? [...] No, i is not mutable! i is a name for a number object which is _not_ mutable (http://www.python.org/doc/2.4/ref/types.html). The line i=i+1 creates a new number object with the value 1 and gives it the name i. Bye, Dennis -- http://mail.python.org/mailman/listinfo/python-list
Re: pywhich script - where is that module?
Thomas Guettler wrote: [...] Nice, you could add it to the python cookbook. [...] Just in the case the OP doesn't know where to find the cookbook: http://aspn.activestate.com/ASPN/Cookbook/Python/ -- http://mail.python.org/mailman/listinfo/python-list
Re: wxPython bug
Jive wrote: [...] What to do? Ask in comp.soft-sys.wxwindows -- http://mail.python.org/mailman/listinfo/python-list
