🌐 Mailman 3 April 2007 - Python-list - python.org

frame of Qt program
by Marco April 2, 2007

April 2, 2007

Hi, I want to write a PyQt4 program, which like a graph-ssh. One side user choose server moder, and other side(s) user choose client mode. Both of them have a GUI, they can connect via socket. I have study PyQt4 for a while and learn a little socket(from W.R Stevens Unix Networking Programming). But I donot know how to integer both of them. What the frame of this kind of program looked like? Or is there some example? Thank you !! -- LinuX Power

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Re: How can i compare a string which is non null and empty
by Steven D'Aprano April 2, 2007

April 2, 2007

On Mon, 02 Apr 2007 01:35:17 +0200, Georg Brandl wrote: > Plissken.s(a)gmail.com schrieb: >> Hi, >> >> how can i compare a string which is non null and empty? >> >> >> i look thru the string methods here, but cant find one which does it? >> >> http://docs.python.org/lib/string-methods.html#string-methods >> >> In java,I do this: >> if (str != null) && (!str.equals("")) .... >> >> how can i do that in python? > > Strings cannot be "null" in Python. > > If you want to check if a string is not empty, use "if str". I tried that, and I get something unexpected. >>> if str: ... print "What's going on here?" ... else: ... print "An empty string." ... What's going on here? > This also includes the case that "str" may not only be an empty > string, but also None. What about the case where str hasn't been shadowed and is a built-in type? >>> str <type 'str'> -- Steven D'Aprano

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vim python: substitute 'spaces' indent to 'tabs'?
by Rocky Zhou April 2, 2007

April 2, 2007

I am accustomed to vi my pthon scripts with 'tab' indent. But when I copy some code to my script, the indent may be 'spaces'. So I wanna a way to substitute those 'spaces' to be 'tabs' conveniently. For example, I: expand -t4 test.py >/tmp/test2.py vi /tmp/test2.py Then in vim, the indents should be: /^\( \{4\}\)*/ but I don't know how to substitute this to that: /^\(\t\{\4\}\)*/ Is there any way? Thanks.

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IDLE problem
by Urban, Gabor April 2, 2007

April 2, 2007

Hi, I have a strange problem with the latest 2.4.4 on MS XP. If I rrun a test script in DOS window, it is ok. From the Python shell I got error: <Sniiffff> Python 2.4.4 (#71, Oct 18 2006, 08:34:43) [MSC v.1310 32 bit (Intel)] on win32 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 1.1.4 >>> ================================ RESTART ================================ >>> ........ ---------------------------------------------------------------------- Ran 8 tests in 0.016s OK Traceback (most recent call last): File "D:\Gabaux\Python\TodoList\datetest.py", line 76, in -toplevel- unittest.main() File "D:\Python24\lib\unittest.py", line 759, in __init__ self.runTests() File "D:\Python24\lib\unittest.py", line 797, in runTests sys.exit(not result.wasSuccessful()) SystemExit: False >>> <Sniiffff> The script I was executing was a simple unittest.TestCase descendant. Any ideas? Gabor Urban NMC - ART

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python unzip: os.popen3("unzip ...") or import zipfile?
by Rocky Zhou April 2, 2007

April 2, 2007

python unzip At first, I tried to use 'os.popen3("unzip ...") like this: fin, fout, ferr = os.popen3("unzip -o -d %s %s" % (dest, zipfile)) strerr = ferr.read() # This makes the program hanging up if strerr: print >> sys.stderr, strerr outlog.error(strerr) I want to know is this caused by the 'unzip' command does not print 'EOF'? or any other reasons? At last I did this to do 'unzip': import zipfile def _extract_all(self, destdir): namelist = self.namelist() namelist.sort() for name in namelist: if name.endswith('/'): print name os.mkdir(os.path.join(destdir, name)) else: outfile = open(os.path.join(destdir, name), 'wb') outfile.write(self.read(name)) outfile.close() zipfile.ZipFile.extract_all = _extract_all def unzip(...): zipo = zipfile.ZipFile(zipfn, 'r') zipo.extract_all(dest) But I still want to know the reason why can't os.popen3("unzip ...") be used. Thanks.

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win32con.client.constants error
by Barry Newberger April 2, 2007

April 2, 2007

I am working on a Outlook COM project. For some reason win32com.client.constants quit working between runs of one of my test scripts. It's supposed to acquire attributes for all constants defined in loaded COM servers through its __dicts__ attribute,and did for awhile Now it is throwing an AttributeError: PythonWin 2.4.4 (#71, Oct 18 2006, 08:34:43) [MSC v.1310 32 bit (Intel)] on win32. Portions Copyright 1994-2006 Mark Hammond - see 'Help/About PythonWin' for further copyright information. Traceback (most recent call last): File "C:\Python24\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py", line 310, in RunScript exec codeObject in __main__.__dict__ File "C:\Documents and Settings\bnewberg\Desktop\mail_script\mail_move_init_test.py", line 22, in ? msgFolderTypeConsts = {'Rcvd': constants.olFolderInbox, 'Sent': constants.olFolderSentMail} File "C:\Python24\Lib\site-packages\win32com\client\__init__.py", line 168, in __getattr__ raise AttributeError, a AttributeError: olFolderInbox Code snippet: from win32com.client import gencache, constan [SNIP] class MSOutlook(object): def __init__(self): try: self.oOutlookApp = gencache.EnsureDispatch("Outlook.Application") self.outlookFound = True except: print "MSOutlook: unable to load Outlook" self.outlookFound = False if not self.outlookFound: return [SNIP] # Outlook default folder constants msgFolderTypeConsts = {'Rcvd': constants.olFolderInbox, 'Sent': constants.olFolderSentMail} folderSet = [yr, mo, msgType] # Used to loop over folder tree. I am running Python 2.4.4 and pywin32-210. I tried reinstalling pywin without success. Thanks, Barry Newberger

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Re: How can i compare a string which is non null and empty
by Grant Edwards April 2, 2007

April 2, 2007

On 2007-04-02, Shane Geiger <sgeiger(a)ncee.net> wrote: >>> how can i compare a string which is non null and empty? >>> >> [...] >> >>> In java,I do this: >>> if (str != null) && (!str.equals("")) .... >>> >>> how can i do that in python? >> >> If you want to litterally do that, it's >> >> if (str != None) and (str != ""): >> <whatever> >> >> However, the standard idiom for doing that in Python is >> >> if str: >> <whatever> > > It is probably worth noting that the example is not executable code: > str() is a function. Yea, sorry about that. -- Grant Edwards grante Yow! Now I'm concentrating at on a specific tank battle visi.com toward the end of World War II!

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How can i compare a string which is non null and empty
by Plissken.s＠gmail.com April 2, 2007

April 2, 2007

Hi, how can i compare a string which is non null and empty? i look thru the string methods here, but cant find one which does it? http://docs.python.org/lib/string-methods.html#string-methods In java,I do this: if (str != null) && (!str.equals("")) .... how can i do that in python?

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capturing system exit status
by oscartheduck April 2, 2007

April 2, 2007

Hi folks, in a program I'm writing I have several commands I pass to the unix OS underneath the code. I want to perform error checking to make sure that the OS commands' exit gracefully, but I'm not seeing a simple python module to do this. The closest I can see is system(), as detailed here: http://www.python.org/doc/2.1.3/lib/os-process.html, but I can't formulate a way to use it. What I want is a simple if statement such that: if ExitStatusIsBad: sys.exit() else: go on to next code chunk

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manually implementing staticmethod()?
by 7stud April 2, 2007

April 2, 2007

Hi, Can someone show me how to manually implement staticmethod()? Here is my latest attempt: ---------------- def smethod(func): def newFunc(): pass def newGet(): print "new get" newFunc.__get__ = newGet return newFunc class Test(object): def show(msg): print msg show = smethod(show) Test.show("hello") -------------- ...but I keep getting the error: TypeError: unbound method newFunc() must be called with Test instance as first argument (got str instance instead) I think I need to intercept the function's __get__() method in order to block creation of the method object, which requires that the unbound method call provide an instance.

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