Re: [Tutor] Verifying My Troublesome Linkage Claim between Python and Win7
Wayne Watson sierra_mtnv...@sbcglobal.net wrote incoherency. For what it's worth, and that's about zero, I'm working with my old XP and W7 machine's keyboards, mice and monitors side-by-side. I have several times found my self using the wrong device. In that situation I find it useful to make the old environment as hostile as possible. So I'd make the resolution on the XP box something like 800x600 and set the wallpaper to a garish colour like red. That way I never mistake which machine I'm on! FWIW I do the same with the root account on Unix boxes... That makes sure I spend as little time as possible in the environment that I don't want to stay in. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] CGI File Uploads
Hi, today i need some help with the python manual. I've found this fileupload example http://webpython.codepoint.net/cgi_file_upload on that site. It's taking from fileitem attributes like filename and file. Where is the complete list of those attributes or methods? Thankyou -- -- AnotherNetFellow Email: anothernetfel...@gmail.com ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Verifying My Troublesome Linkage Claim between Python and Win7
Wayne Watson wrote: snip You tell us to try this and give a folder structure: Folder1 track1.py data1.txt data2.txt data3.txt Folder2 track1.py dset1.txt dset2.txt ... dset8.txt snip Maybe one simple test at a time will get better responses. Since you wouldn't tell me what tabs you saw in Explorer when you did properties, maybe you'll tell me what you see in CMD. Go to a cmd prompt (DOS prompt), change to the Folder2 directory, and type dir. paste that result, all of it, into a message. I suspect you'll see that you don't have track1.py there at all, but track1.py.lnk If so, that's a shortcut. The only relevant change in Win7 that I know of is that Explorer shows shortcuts as link rather than shortcut. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Any Tutor there ? Removing redundant parameters in a models file having include files.
Hello Tutor, Since Friday I get no answers to my first post. So I re-post it was missed by the numerous arriving email: This is my first program in python. I am doing electrical simulation in spectre (spice like). I have a models file which holds many parameters and include files of parameters. But in batch mode the automatic construction (by the simulator) of this file is not correct. It concatenates both parameters and include files with the same parameters definitions. That trigs errors during simulation and it complains about parameters double definition. The program must removes includes files of already existing parameters in the models file. The file format is shown below: // -- // Mismatch Variations Selection // -- parameters param1=0 parameters param2=0 parameters param3=0 parameters param4=0 // -- // Global Flags Definition // -- parameters gflag_param = 0 // -- // Models Library Files References // -- include /project/hvt.scs section=TT include /project/lvt.scs section=TT include /project/svt.scs section=TT include /project/veriloga.scs section=typ include /project/switch_all.scs section=no --- Now my code is shown below: ___ #!/usr/bin/env python # File: correctCorners K.Liateni 2010-02-25 import re # --- # Functions Declaration # --- def copy(infile, outfile): Copy of the content of an input file to an outputfile. fout = open(outfile, 'w') fout.writelines(getLines(infile)) fout.close() def cat(lines, outfile): Concat the content of a strings list to an outputfile. f = open(outfile, 'w') f.writelines(lines) f.close() def getLines(file): Get the content of a file in a lines list form. f = open(file, 'r') lines = f.readlines() f.close() return lines def isParamExist(file, pattern, parameters): Check if a particular regex pattern parameter is existing in a parameters file. lines = getLines(file) paramExpressions = [ e for e in lines if pattern.search(e) ] matchParam = [ e for e in paramExpressions if pattern.search(e).group(1) in parameters ] if matchParam: return True else: return False # --- # Main Start here # --- parRe = '^[ \t]*(parameters[ \t]+[^ \t]+)[ \t]*=' comRe = '^[ \t]*//' include = re.compile(incRe) param = re.compile(parRe) comment = re.compile(comRe) lines = getLines(models.scs) linesWithNoInclude = [ e for e in lines if not include.search(e) ] linesWithNoParam = [ e for e in lines if not param.search(e) and not comment.search(e) ] parameters = [ param.search(e).group(1) for e in linesWithNoInclude if param.search(e) ] includeFiles = [ include.search(e).group(1) for e in linesWithNoParam ] includeFilesToWrite = [ e for e in includeFiles if not isParamExist(e, param, parameters) ] includeFilesToWrite = [ e for e in linesWithNoParam if include.search(e).group(3) in includeFilesToWrite ] cat(linesWithNoInclude+includeFilesToWrite, models_modified.scs) copy(models_modified.scs, models.scs): # --- end of file --- # The code works well but I am not fully happy with it. includeFilesToWrite is computed in 2 steps. I am pretty sure that it can be simplify by using a dictionnary with the full path file as the key and the string 'include' nominal line expression as the value to construct the final file with filtered include. I am using python 2.2 so I have not use latest feature I want my code to run on old Solaris too (linux user). I use as much as possible list comprehension following your advices. I don't like the part: if matchParam: return True else: return False Is there an easy way to do the same behavior. I am not sure but I saw one time something like using the int value of True (1) and False (0) to select return value in a list of 2 elements 'return [False,True](matchParam)' Is it correct? Thanks a lot Karim ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Omitting lines matching a list of strings from a file
One formatting detail: there is a blank line after each line printed, how do I ged rid of the extra blank lines? lines = [line.strip() for line in infile if line[146:148] not in omit_states] print '\n'.join(lines) This approach stripped leading blank spaces introducing errors into my fixed width file. or alternatively lines = [line for line in infile if line[146:148] not in omit_states] print ''.join(lines) This works beautifully leaving leading blank spaces intact. Thanks. Just remember that doing a list comprehension like that on a large file will drastically reduce the speed of your application as well as introduce memory bloat. Processing a file with well over 1 million records worked very quickly, several seconds. Did not notice excessive memory bloat. I do have 2 gigs of ram on my Macbook Pro however. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Any Tutor there ? Removing redundant parameters in a models file having include files.
Karim Liateni karim.liat...@free.fr wrote It concatenates both parameters and include files with the same parameters definitions. That trigs errors during simulation and it complains about parameters double definition. I'd suggest you construct a dictionary based on the param names You can check before you add ca param if one already exists. Or alternatively make a Set of param names and check that for existence before adding a new one. def copy(infile, outfile): Copy of the content of an input file to an outputfile. fout = open(outfile, 'w') fout.writelines(getLines(infile)) fout.close() Its probably easier tyo use shutil.copyfile() def cat(lines, outfile): Concat the content of a strings list to an outputfile. f = open(outfile, 'w') f.writelines(lines) f.close() def getLines(file): Get the content of a file in a lines list form. f = open(file, 'r') lines = f.readlines() f.close() return lines I'm not sure these functions add enough value to ghave them. I';d probably just use try: open(outfile,'w').writelines(lines) except IOError: #handle error try: lines = open(filename).readlines() except IOError: #handle error The close will be done automatically since you don't hold a reference to the file def isParamExist(file, pattern, parameters): Check if a particular regex pattern parameter is existing in a parameters file. lines = getLines(file) paramExpressions = [ e for e in lines if pattern.search(e) ] matchParam = [ e for e in paramExpressions if pattern.search(e).group(1) in parameters ] if matchParam: return True else: return False return bool(matchParam) instead of the if/else I am pretty sure that it can be simplify by using a dictionnary with the full path file as the key and the string 'include' nominal line expression as the value to construct the final file with filtered include. I think dictionaries or Sets could improve things I don't like the part: if matchParam: return True else: return False See the note above. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Any Tutor there ? Removing redundant parameters in a models file having include files.
On 03/01/10 01:12, Alan Gauld wrote: def getLines(file): Get the content of a file in a lines list form. f = open(file, 'r') lines = f.readlines() f.close() return lines I'm not sure these functions add enough value to ghave them. I';d probably just use try: open(outfile,'w').writelines(lines) except IOError: #handle error try: lines = open(filename).readlines() except IOError: #handle error The close will be done automatically since you don't hold a reference to the file Remember why we have the new with-block? It's precisely because files will be automagically closed only if we're running on CPython; Python the language and thus alternative implementations doesn't guarantee automatic closing. I'd agree with the function having minimal utility value though: with open(file) as f: lines = f.readlines() # f.close() will be called by the context manager and if you're just copying to another file: from contextlib import nested with nested(open(infile), open(outfile, 'w')) as (fin, fout): fout.write(fin.read()) or even better, as Alan suggested, using shutil.copyfile(). ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Any Tutor there ? Removing redundant parameters in a models file having include files.
Lie Ryan wrote: On 03/01/10 01:12, Alan Gauld wrote: def getLines(file): Get the content of a file in a lines list form. f = open(file, 'r') lines = f.readlines() f.close() return lines I'm not sure these functions add enough value to ghave them. I';d probably just use try: open(outfile,'w').writelines(lines) except IOError: #handle error try: lines = open(filename).readlines() except IOError: #handle error The close will be done automatically since you don't hold a reference to the file Remember why we have the new with-block? It's precisely because files will be automagically closed only if we're running on CPython; Python the language and thus alternative implementations doesn't guarantee automatic closing. I'd agree with the function having minimal utility value though: with open(file) as f: lines = f.readlines() # f.close() will be called by the context manager and if you're just copying to another file: from contextlib import nested with nested(open(infile), open(outfile, 'w')) as (fin, fout): fout.write(fin.read()) or even better, as Alan suggested, using shutil.copyfile(). ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Thank you Lie but I have a restriction on the python version I must use v2.2. This feature is available only on later version 2.5 I believe. Regards Karim ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] CGI File Uploads
Alan, i don't know how to use it in this case. import cgi form = cgi.FieldStorage() fileitem = form['file'] Function dir() lists all functions in a module, i could only use it for cgi It will list all the names in any kind of object not just a module. If you type the code above at the prompt you should be able to do: import cgi form = cgi.FieldStorage() help(form) OR, You could go more directly using import cgi help(cgi.FieldStorage) HTH Alan G.___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Any Tutor there ? Removing redundant parameters in a models file having include files.
On 03/01/10 02:49, Karim Liateni wrote: Lie Ryan wrote: On 03/01/10 01:12, Alan Gauld wrote: def getLines(file): Get the content of a file in a lines list form. f = open(file, 'r') lines = f.readlines() f.close() return lines I'm not sure these functions add enough value to ghave them. I';d probably just use try: open(outfile,'w').writelines(lines) except IOError: #handle error try: lines = open(filename).readlines() except IOError: #handle error The close will be done automatically since you don't hold a reference to the file Remember why we have the new with-block? It's precisely because files will be automagically closed only if we're running on CPython; Python the language and thus alternative implementations doesn't guarantee automatic closing. I'd agree with the function having minimal utility value though: with open(file) as f: lines = f.readlines() # f.close() will be called by the context manager and if you're just copying to another file: from contextlib import nested with nested(open(infile), open(outfile, 'w')) as (fin, fout): fout.write(fin.read()) or even better, as Alan suggested, using shutil.copyfile(). ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Thank you Lie but I have a restriction on the python version I must use v2.2. This feature is available only on later version 2.5 I believe. Then you should at the least use the try-finally block, I think that one has been there since 2.2? If you didn't use try-finally, there is no guarantee that f.close() would be called if an exception happened in the middle of reading/writing (e.g. KeyboardInterrupt, or perhaps user plugging off the thumbdrive, or bit more realistic having a full harddisk or exceeded some disk quota) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Any Tutor there ? Removing redundant parameters in a models file having include files.
Lie Ryan wrote: On 03/01/10 02:49, Karim Liateni wrote: Lie Ryan wrote: On 03/01/10 01:12, Alan Gauld wrote: def getLines(file): Get the content of a file in a lines list form. f = open(file, 'r') lines = f.readlines() f.close() return lines I'm not sure these functions add enough value to ghave them. I';d probably just use try: open(outfile,'w').writelines(lines) except IOError: #handle error try: lines = open(filename).readlines() except IOError: #handle error The close will be done automatically since you don't hold a reference to the file Remember why we have the new with-block? It's precisely because files will be automagically closed only if we're running on CPython; Python the language and thus alternative implementations doesn't guarantee automatic closing. I'd agree with the function having minimal utility value though: with open(file) as f: lines = f.readlines() # f.close() will be called by the context manager and if you're just copying to another file: from contextlib import nested with nested(open(infile), open(outfile, 'w')) as (fin, fout): fout.write(fin.read()) or even better, as Alan suggested, using shutil.copyfile(). ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Thank you Lie but I have a restriction on the python version I must use v2.2. This feature is available only on later version 2.5 I believe. Then you should at the least use the try-finally block, I think that one has been there since 2.2? If you didn't use try-finally, there is no guarantee that f.close() would be called if an exception happened in the middle of reading/writing (e.g. KeyboardInterrupt, or perhaps user plugging off the thumbdrive, or bit more realistic having a full harddisk or exceeded some disk quota) ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Thank you Lie. Yes, in fact I did it all the time during my years of Java development. In perl I used or open() or die( msg ) structure. I bypassed it because I wanted to construct the blocs very quickly like a 'beginner'. I was excited to make it work as fast as ossible to see if I can program something decent in Python. (gaining confidence? haaa human nature!). I definitely enjoy python (and not very far in spirit my loving Lisp). I definitely HATE tcl, java. Now I will improve quality and robustness. Thanks a lot! Karim ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Over-riding radians as default for trig calculations
After importing the math module and running math.cos( x ) the result is in radians. Is there a way of setting this so that it results in degrees? I don't want to over-ride this permanently for my Python settings, so am happy to specifically do it per equation or per program. Thanks in advance. AG ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Over-riding radians as default for trig calculations
On Sun, Feb 28, 2010 at 8:39 PM, AG computing.acco...@googlemail.com wrote: After importing the math module and running math.cos( x ) the result is in radians. Is there a way of setting this so that it results in degrees? I don't want to over-ride this permanently for my Python settings, so am happy to specifically do it per equation or per program. Thanks in advance. There is no setting to override, but you could easily define your own function to do a conversion for you. The wikipedia page on radians explains how to convert between the two, and writing a function to do that should be quite trivial. Hugo ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] OOD - Another class question
I have another question related to OOD. What I have is a module with one parent class and two child classes. Some stuff is done to the object that is passed to the function in one of the child classes and this then calls a function from the global class passing local variables (from the child class). When I do this, I am told: AttributeError: 'HillBuilder' object has no attribute 'MountainBuilder' The question is, what am I doing wrong? Here is an example: class MountainBuilder(object): def __init__(self, mountain): self.mountain = mountain self.mountain_func self.pinetree_func def pinetree_func(self, knoll) do stuff to knoll return knoll def mountain_func(self, hill) knoll = hill * 2 pinetree = pintree_func(knoll) return hill class HillBuilder(MountainBuilder): def __init__(self, mountain): OptionLoad.__init__(self, mountain) self.MountainBuilder.mountain_func self.hill_func def hill_func(self) hill= do stuff to self.mountain grassyknoll = MountainBuilder.mountain_func(hill) return grassy knoll do stuff with grassy knoll ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] OOD - Another class question
On Sun, Feb 28, 2010 at 06:24:09PM -0500, James Reynolds wrote: I have another question related to OOD. What I have is a module with one parent class and two child classes. Some stuff is done to the object that is passed to the function in one of the child classes and this then calls a function from the global class passing local variables (from the child class). I think you're confusing containers with inheritance. class MountainBuilder(object): def __init__(self, mountain): self.mountain = mountain self.mountain_func --- what's this? self.pinetree_func --- what's this? class HillBuilder(MountainBuilder): def __init__(self, mountain): OptionLoad.__init__(self, mountain) self.MountainBuilder.mountain_func There is no MountainBuilder attribute in HillBuilder. Rather, HillBuilder is a refined type of a MountainBuilder, and inherits everything MountainBuilders have, plus what you change or add to that base in HillBuilder. You're treating it like it's a separate class which contains a MountainBuilder object inside it as an attribute. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Any Tutor there ? Removing redundant parameters in a models file having include files.
Karim Liateni karim.liat...@free.fr wrote def getLines(file): try: lines = open(filename).readlines() ; return lines except IOError: #handle error but in the second 'lines = open(filename).readlines()' I don't hold indirectly a reference to the file? Please, could you explain more this point? Sure, the lines variable holds a reference to the list returned by readlines. There is no variable referring to the file object so immediately after readlines completes the file will be ready to be closed (at least in CPython as already pointed out by Lie) HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] OOD - Another class question
James Reynolds eire1...@gmail.com wrote parent class and two child classes. Some stuff is done to the object that is passed to the function in one of the child classes and this then calls a function from the global class passing local variables (from the child class). You really need to tighten up on the terminology because the imprecision is part of your problems understanding the concepts. You pass an object to a method of a child class which calls a method in the parent class. You pass instance variables of the child class as arguments to the parent class method.. When I do this, I am told: AttributeError: 'HillBuilder' object has no attribute 'MountainBuilder' The question is, what am I doing wrong? Confusing inheritance with composition. Your child class does not have an attribute MountainBuilder, it *is* a MountainBuilder. self within the method referes to your subclass of MountainBuilder so you only need self. class MountainBuilder(object): def pinetree_func(self, knoll) do stuff to knoll return knoll def mountain_func(self, hill) knoll = hill * 2 pinetree = pintree_func(knoll) return hill class HillBuilder(MountainBuilder): def __init__(self, mountain): OptionLoad.__init__(self, mountain) self.MountainBuilder.mountain_func This should be self.mountain_func(mountain) def hill_func(self) hill= do stuff to self.mountain grassyknoll = MountainBuilder.mountain_func(hill) And this should be grassyknoll = self.mountain_func(hill) mountain func as a method of MountainBuilder is also a method of HillBuilder (thats what inheritance means) so you access it through self. Take a look at the BankAccount example in the OOP topic of my tutor for more examples of subclasses calling superclass methods HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
