Re: Couple of noobish question
Tim Rowe a écrit : 2009/2/4 Bruno Desthuilliers bdesth.quelquech...@free.quelquepart.fr: # somemodule.py import os if os.uname()[0] == Linux: On an MS Windows system, os.uname()[0] raises an AttributeError Thanks for the correction - as you may have guessed, I have not used windows for years !-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
2009/2/5 Bruno Desthuilliers bruno.42.desthuilli...@websiteburo.invalid: Thanks for the correction - as you may have guessed, I have not used windows for years !-) And I can't get Linux running (more precisely, I can't /keep/ X-Windows running). Isn't it a good job that Python is cross-platform -- as long as we stay clear of the os module :-) -- Tim Rowe -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
On Feb 4, 10:47 am, Catherine Heathcote catherine.heathc...@gmail.com wrote: Firstly hi, I don't know any of you yet but am picking up Python and will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4 years of a comp tech degree, long story) and am learning Python, 'cos I saw some code and it just looks a really nice language to work with. I come from C++, so I am bound to trip up trying to do things the wrong way! I have been working with Project Euler to get the hang of Python, and all goes well. I have an idea for a small project, an overly simplistic interactive fiction engine (well more like those old choose your own adventure books, used to love those!) that uses XML for its map files. The main issues I see so far is the XML parsing (I should pick that up ok, I have a blackbelt in google-foo), but more importantly splitting code files. In C++ I would obviously split .cpp and .h files, pairing them up and using #include. How do I do this in Python? I see that you don't tend to split logic from defenition, but how do I keep different classes in different files? My google-fu fails me so far. You just use the keyword import. Here's a goofy example: 1) foo.py contains a class called Foo 2) bar.py contains a script that imports Foo: import foo # create an instance of the Foo class myFoo = foo.Foo() I hope that was clear. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
Mike Driscoll wrote: On Feb 4, 10:47 am, Catherine Heathcote catherine.heathc...@gmail.com wrote: Firstly hi, I don't know any of you yet but am picking up Python and will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4 years of a comp tech degree, long story) and am learning Python, 'cos I saw some code and it just looks a really nice language to work with. I come from C++, so I am bound to trip up trying to do things the wrong way! I have been working with Project Euler to get the hang of Python, and all goes well. I have an idea for a small project, an overly simplistic interactive fiction engine (well more like those old choose your own adventure books, used to love those!) that uses XML for its map files. The main issues I see so far is the XML parsing (I should pick that up ok, I have a blackbelt in google-foo), but more importantly splitting code files. In C++ I would obviously split .cpp and .h files, pairing them up and using #include. How do I do this in Python? I see that you don't tend to split logic from defenition, but how do I keep different classes in different files? My google-fu fails me so far. You just use the keyword import. Here's a goofy example: 1) foo.py contains a class called Foo 2) bar.py contains a script that imports Foo: import foo # create an instance of the Foo class myFoo = foo.Foo() I hope that was clear. Mike Perfect, thanks ^^ -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
Catherine Heathcote wrote: Firstly hi, I don't know any of you yet but am picking up Python and will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4 years of a comp tech degree, long story) and am learning Python, 'cos I saw some code and it just looks a really nice language to work with. I come from C++, so I am bound to trip up trying to do things the wrong way! Welcome. I suspect you'll enjoy Python. (Far more than C++ ). I have been working with Project Euler to get the hang of Python, and all goes well. I have an idea for a small project, an overly simplistic interactive fiction engine (well more like those old choose your own adventure books, used to love those!) that uses XML for its map files. The main issues I see so far is the XML parsing (I should pick that up ok, I have a blackbelt in google-foo), but more importantly splitting code files. Several modules exits to do the parsing of XML: elementtree, xml, and beautifulsoup come to mind immediately. In C++ I would obviously split .cpp and .h files, pairing them up and using #include. How do I do this in Python? I see that you don't tend to split logic from defenition, but how do I keep different classes in different files? My google-fu fails me so far. Use the import statement for this. If file a.py defines some classes or functions a.py: class UsefulClass: ... def UsefulFn(...): ... Then your main Python file imports it and uses the things define in a.py like this: import a ob = UsefulClass(...) a.UsefulFn() Good luck, Gary Herron -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
Catherine Heathcote a écrit : Firstly hi, I don't know any of you yet but am picking up Python and will be lurking here a lot lol. I am a hobbiest coder (did 3 out of 4 years of a comp tech degree, long story) and am learning Python, 'cos I saw some code and it just looks a really nice language to work with. I come from C++, so I am bound to trip up trying to do things the wrong way! I have been working with Project Euler to get the hang of Python, and all goes well. I have an idea for a small project, an overly simplistic interactive fiction engine (well more like those old choose your own adventure books, used to love those!) that uses XML for its map files. You may have good reasons to choose this format, but FWIW, some (most ?) of us here tend to prefer lighter formats like json or yaml, or even just plain Python source. But, well, just so you know there are possible alternatives to XML !-) The main issues I see so far is the XML parsing (I should pick that up ok, I have a blackbelt in google-foo), but more importantly splitting code files. ??? Oh, you mean, how to organize your source code ? In C++ I would obviously split .cpp and .h files, pairing them up and using #include. How do I do this in Python? I see that you don't tend to split logic from defenition, Ok. First thing you must know: in Python, almost everything happens at runtime (the only error you might get at compile time is SyntaxError), and import, class and def are actually executable statements. That is, when a module (or main program FWIW) is first loaded (directly for the main program, via an import statement for other modules), all the top-level code of the corresponding source file is executed sequentially. One of the implications is that there's no need for preprocessor directives - you just use Python code (at the module top-level) to have alternative versions of a function or conditional imports (which BTW are _not_ the same as #include directives ). Like: # somemodule.py import os if os.uname()[0] == Linux: def somefunc(): return this is the Linux version else def somefunc(): return this is not the Linux version try: import some_module something = some_module.something else: # some_module not installed something = default # etc... To make a long story short: your notions of definition and logic don't really apply here. but how do I keep different classes in different files? You don't necessarily have to keep you class in different files - it really depends on the project's complexity. If you only have a couple classes, functions and (pseudo)constants, you just stick them either in the main program file (if it's a simple script) or in a module. If it gets a bit more complex, regroup classes and functions in distinct modules or packages trying to make each module (or package) as cohesive and decoupled as possible. Just have at look at the modules and packages in the stdlib to see what it may looks like. My google-fu fails me so far. You were probably lokking for this: http://docs.python.org/tutorial/modules.html My two cents... -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
2009/2/4 Bruno Desthuilliers bdesth.quelquech...@free.quelquepart.fr: # somemodule.py import os if os.uname()[0] == Linux: On an MS Windows system, os.uname()[0] raises an AttributeError -- sys doesn't seem to contain uname. Is that a Linux thing? Would os.name work on Linux? Or would one have to use exception handling and catch the Windows case? That's the trouble with using anything in os, of course -- it's os dependent, which is why it's there! :-) -- Tim Rowe -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
On Feb 5, 11:14 am, Tim Rowe digi...@gmail.com wrote: ... On an MS Windows system, os.uname()[0] raises an AttributeError -- sys doesn't seem to contain uname. Is that a Linux thing? Would os.name work on Linux? Or would one have to use exception handling and catch the Windows case? It seems to be a Windows thing. My Linux box gives me 'Linux' the server gives me 'SunOS' and a Mac tells me 'Darwin'. I'm still running Python2.4 on the Windows box. At least in that version on the OS, the 'os' module has no attribute 'uname', On both Linux and SunOS, os.name returns 'posix'. -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
2009/2/5 afri...@yahoo.co.uk: On Feb 5, 11:14 am, Tim Rowe digi...@gmail.com wrote: ... On an MS Windows system, os.uname()[0] raises an AttributeError -- sys doesn't seem to contain uname. Is that a Linux thing? Would os.name work on Linux? Or would one have to use exception handling and catch the Windows case? It seems to be a Windows thing. My Linux box gives me 'Linux' the server gives me 'SunOS' and a Mac tells me 'Darwin'. I'm still running Python2.4 on the Windows box. At least in that version on the OS, the 'os' module has no attribute 'uname', On both Linux and SunOS, os.name returns 'posix'. Python in a Nutshell states that os.uname exists only on certain platforms, and in the code sample wraps it in a try statement. That seems to be the safe way to go -- except (and I don't know much about this) wouldn't code have to be digging into some pretty obscure corners to find a difference between different posix implementations? -- Tim Rowe -- http://mail.python.org/mailman/listinfo/python-list
Re: Couple of noobish question
On Feb 5, 11:45 am, Tim Rowe digi...@gmail.com wrote: [snip] Python in a Nutshell states that os.uname exists only on certain platforms, and in the code sample wraps it in a try statement. That seems to be the safe way to go -- except (and I don't know much about this) wouldn't code have to be digging into some pretty obscure corners to find a difference between different posix implementations? Perhaps not, if the particular posix implementation is Mac OSX. I would think that trying os.uname() first and then os.name if it throws will give you the clearest picture of which OS you are facing. Alternatively you could query os.name and if that says 'posix' proceed to call os.uname(). -- http://mail.python.org/mailman/listinfo/python-list
