🌐 Mailman 3 August 2003 - Tutor - python.org

Backslashes inside of variable
by Phoebus Nov. 23, 2003

Nov. 23, 2003

I am running Python 2.2 on Win2k. I have a program which writes a filename, with backslashes to a file, along with other stuff. I read the file in using readlines() and put each line into a variable. My problem is I want to use the filename, but I can't use it because of the backslashes. I know about doing open(r"d:\test\file.txt","w") or even open(`d:\test\file.txt`,"w"), but the filename is inside of a variable so when I do open(filename,'w'), I have problems. Can anyone help? Thanks, Steve --

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translating some python code to perl
by Lloyd Kvam Oct. 6, 2003

Oct. 6, 2003

I need to provide the contents of a python dictionary to a perl programmer as a perl hash table. However, the python dictionary contains dictionaries, and I have been unable to figure out the perl syntax for nexting and referencing hash tables. Here's a python sample: #python d1 = {'1': 'one', '2': 'two', 'd2': {'nest1': 'nest one', 'nest2': 'nest two',} } d1['1'] # returns 'one' d1['d2'] # returns the d2 hash d1['d2']['nest1'] # returns 'nest one' Here is my attempted perl equivalent: #!/usr/bin/perl # testhash.pl %d1 = ( '1' => 'one', '2' => 'two', %d2 = ('nest1' => 'nest one', 'nest2' => 'nest two',) ); print "\nlookup 1 in d1: $d1{'1'}\n"; print "\nlookup d2 within d1: %d1{'d2'}\n"; print "\nlookup nest1 in d2 within d1: $d1{d2}{'nest1'}\n"; ###end of perl script $d1{'1'} returns the scalar 'one' So that's as far as I was able to go. I am not sure if my hash table is correct. Please help me fix the hash table definition and the references so that I can verify that it works. -- Lloyd Kvam Venix Corp. 1 Court Street, Suite 378 Lebanon, NH 03766-1358 voice: 603-443-6155 fax: 801-459-9582

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Python - XML: How to write UNICODE to a file ?? (when using LATIN-1 Chars)
by Javier JJ Sept. 4, 2003

Sept. 4, 2003

Hi all!! I'm getting my feet wet with Python + XML processing and I've run into something that's stopping me: I have an xml file with ASCII characters (no encoding is specified; it contains characters valid in the latin-1 charset - it's a log file generated by MSN Messenger 6.0). I am processing it with mindom as follows: doc = minidom.parse(log_file.xml) rootNode = doc.childNodes[1] Now, I can do all sorts of manipulation on the nodes w/o any problem But afterwards I want to write the result back to disk as XML, so I do: >>> out = open("salida.txt", "wb") >>> listado = rootNode.toxml() Now "listado" has a xml-looking unicode string; it looks quite fine to me... but when I try to write it to disk, I get: >>> out.write(listado) Traceback (most recent call last): File "<pyshell#34>", line 1, in -toplevel- out.write(listado) UnicodeEncodeError: 'ascii' codec can't encode character '\ued' in position 2274: ordinal not in range(128) The "offending" character is: >>> listado[2274] u'\xed' >>> print listado[2274] í In the original XML file (after all, I'm writing back the same thing I'm reading) the char appears as follows: </To><Text Style="font-family:Comic Sans MS; color:#000080; ">bien aquÃ</Text></Message> If I cut&paste the text from IDLE into UltraEdit and then save it, and try to view the result, the XSL bombs on the same character: I've tried using both IDLE (python2.3 on cygwin) and PythonWin 2.2.2 (ActiveState) and both complain.... I _know_ that there has to be a way to be able to write back the XML to the file, but I can't figure it out. Any suggestions? Thanks a lot! Javier J

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problems with win32com.client and excel.
by Thomi Richards Sept. 2, 2003

Sept. 2, 2003

Hi guys, For the last month or so I've been trying to develop a piece of a program which enters numbers into an excel spreadsheet. I've managed to get it to go from the interactive interpreter, but as soon as I put those same commands into a file, I get errors: --<snip>-- Traceback (most recent call last): File "wedderburn.py", line 467, in idle self.xlapp.adddata((command,args)) File "C:\Documents and Settings\Administrator\Desktop\wedderburn\excelspread.py", line 58, in adddata self.app.ActiveSheet.Cells(self.x,self.y).Value = d #insert the data into the sheet. File "C:\PYTHON23\lib\site-packages\win32com\client\dynamic.py", line 154, in __call__ return self._get_good_object_(self._oleobj_.Invoke(*allArgs),self._olerepr_.defaultDispatchName,None) pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None, None, None, 0, -2146827284), None) --</snip>-- This is the file "excelspread.py": -<snip>- #!/usr/bin/python import os,sys if os.name != 'nt': print "we're not in a win32 environment, so excel logging will not be available." sys.exit(1) try: import win32com.client except: print "you don't seem to have the python windows/COM extensions installed!\n\nget them from: http://www.python.org/windows/" sys.exit(1) '''This file contains functions and classes to append information to an excel spreadsheet.''' class app: def __init__(self,title="Weight SpreadSheet:"): #we have to start excel with a spreadsheet, and put up the title. self.x = self.y = self.width = 0 self.app = win32com.client.Dispatch("Excel.Application") self.app.Visible = 1 self.app.Workbooks.Add() #set the title: self.app.ActiveSheet.Cells(1,1).Value = title self.y += 1 self.initial = 1 self.cols = {} #that's it as far as initialisation goes... def adddata(self,values): # values will be a two part list. he first part will always contain the # text string 'DATA'. THe second part will be a list of lists. these # inner lists will contain two values. the first will be a header code, # the second item will be the actual data. this from the dummy driver: # # return ['DATA',[['CODENO','0125846'],['NETWEIGHT',netw],['GROSSWEIGHT',grossw],['TARE',tare]]] # code,data = values #unpack the values. self.x = 0 self.y += 1 if self.initial: #this is the first time we have added data to the spreadsheet. we need to set up #the column headers. for chunk in data: c,d = chunk #unpack the code chunk self.cols[c] = self.x #add entry to cols dictionary. self.app.ActiveSheet.Cells(self.x,self.y).Value = d #insert the data into the sheet. self.x += 1 #incriment the x column self.initial = 0 else: for chunk in data: c,d = chunk #unpack the code chunk. self.x = self.cols.get(c,10) #put error messages in col 10 self.app.ActiveSheet.Cells(self.x,self.y).Value = d if __name__ == '__main__': xl = app() # this is the format that data is sent to the class: xl.adddata(['DATA'[['HEADER1','VALUE1'],['HEADER2','VALUE2'],['HEADER3','VALUE3'],['HEADER4','VALUE','4']]]) xl.adddata(['DATA'[['HEADER1','VALUE1'],['HEADER2','VALUE2'],['HEADER3','VALUE3'],['HEADER4','VALUE','4']]]) xl.adddata(['DATA'[['HEADER1','VALUE1'],['HEADER2','VALUE2'],['HEADER3','VALUE3'],['HEADER4','VALUE','4']]]) xl.adddata(['DATA'[['HEADER1','VALUE1'],['HEADER2','VALUE2'],['HEADER3','VALUE3'],['HEADER4','VALUE','4']]]) xl.adddata(['DATA'[['HEADER1','VALUE1'],['HEADER2','VALUE2'],['HEADER3','VALUE3'],['HEADER4','VALUE','4']]]) xl.adddata(['DATA'[['HEADER1','VALUE1'],['HEADER2','VALUE2'],['HEADER3','VALUE3'],['HEADER4','VALUE','4']]]) -</snip>- Normally I wouldn't paste an entire file in anemail, but I'm really stuck. Can anyone point me in the right direction? part of the problem is that the exception error messages are so meaninglkess, and there is almost no documentation about library calls for the com32.client module. (guess I could always try and read the source code...) Thanks, -- Thomi Richards, http://once.sourceforge.net/

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regular expression question
by nihilo Sept. 1, 2003

Sept. 1, 2003

hi, I'm stuck on a regular expression. I want to match everything starting from a word up to and including the next occurence of the word. If the word were a single character (say 'a'), then I could do the following: pat = re.compile('a[^a]*a') The problem is that I haven't been able to find out how to exclude the word if it is more than one character. [^word] excludes the individual letters, not the word as a whole, and I tried grouping with braces and parentheses [^(word)], but these don't work. I've checked many re tutorials, and they all say how to exclude a single character from the set of characters inside the brackets, but not how to exclude more than 1 character. thanks for any help or pointers to resources...

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using the modules and command prompt
by Matthew Bielby Sept. 1, 2003

Sept. 1, 2003

i am new to all forms of programming and python was suggested to me as simple to use and i have found the simple commands easy to do. Now i want to use the winsound module - but i dont know how. I would also like to know/if how you can python to open up cmd.exe or similar and run commands such as ping. Many thanks Matthew _________________________________________________________________ On the move? Get Hotmail on your mobile phone http://www.msn.co.uk/msnmobile

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Executing Store Procedures using PygreSQL
by Peter Brown Aug. 31, 2003

Aug. 31, 2003

Hi list, I've been searching for a reference to executing stored procedures via a select call without luck. Is this function available via PygreSQL? And if so what is the statement format needed to have PostgreSQL execute it. TIA Peter

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Re: [Tutor] OT: spec file
by Danny Yoo Aug. 31, 2003

Aug. 31, 2003

On Sat, 30 Aug 2003, Silviu Cojocaru wrote: > Does someone here has a specfile for building python 2.3 rpms ? [Hmmm... We're getting a lot of installation sort of questions on Python-Tutor lately. Does anyone know what's going on here? Not that I don't like answering questions, but I really don't like 'install' questions that much. Bluntly, I do too much system admin stuff at work already, and I don't want to get bogged down with it here. What do people think?] Hi Silviu, Have you had a chance to look at: http://www.python.org/2.3/rpms.html The page there refers to the 'python2.3.-2.3-4pydotorg.src.rpm' file, which should have the spec file you're looking for. >From your subject line, you mentioned that your question might be off topic. You're right: it is. You might have better luck asking on comp.lang.python for this one next time, so please be more careful. If you have any questions, please feel free to ask.

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RE: [Tutor] Setup so I can import thread.
by Alan Trautman Aug. 31, 2003

Aug. 31, 2003

I believe the module Thread was deprecated I can't find the docs on the Python site right now. However, the threading module should be available and does every thing I know to use threads for. http://www.python.org/doc/2.2p1/lib/module-threading.html for reference HTH, Alan -----Original Message----- From: Jonathan Hayward http://JonathansCorner.com [mailto:jonathan.hayward@pobox.com] Sent: Friday, August 29, 2003 3:55 PM To: tutor(a)python.org Subject: [Tutor] Setup so I can import thread. I built Python.2.3.tgz on a NetBSD box and there was no module thread to import. What do I do to get thread working? TIA, -- ++ Jonathan Hayward, jonathan.hayward(a)pobox.com ** To see an award-winning website with stories, essays, artwork, ** games, and a four-dimensional maze, why not visit my home page? ** All of this is waiting for you at http://JonathansCorner.com _______________________________________________ Tutor maillist - Tutor(a)python.org http://mail.python.org/mailman/listinfo/tutor

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Regex
by Andrei Aug. 30, 2003

Aug. 30, 2003

I'm quite sure I've seen a question of this type before, but I seem unable to find it. How can I match a re pattern ONLY if it is not preceded by another re pattern? I know how to construct both individual regexes, but I don't know how to glue them together in order to achieve this. Think for example of finding all URLs in a piece of text, but *not* if they are inside link tags and therefore preceded by 'href="'. <a href="http://python.org">Python</a> shouldn't give a match, but http://python.org on its own should. Andrei ===== Mail address in header catches spam. Real contact info (decode with rot13): cebwrpg5(a)bcrenznvy.pbz. Fcnz-serr! Cyrnfr qb abg hfr va choyvp cbfgf. V ernq gur yvfg, fb gurer'f ab arrq gb PP.

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