Bug in Python class static variable?
duncan.booth at invalid.invalid
Mon Jul 2 12:52:42 CEST 2007
Bruza <benruza at gmail.com> wrote:
> I am trying to define a class static variable. But the value of the
> static variable seems to be only defined inside the file that the
> class is declared. See the code below. When I run "python w.py", I
When you run "python w.py" the *script* w.py is loaded as the module
__main__. Importing a module called 'w' creates a new module which is
unrelated to __main__. If you want access to variables defined in the main
script then you need to import __main__.
Don't use 'from module import *':
The import statements are executed when the interpreter reaches them in the
source. Even if you fix your code to import from __main__, the values you
try to import from __main__ won't exist when the import statement executes:
the first 'from a import *' will load and execute all of module 'a', but
when that executes 'from __main__ import *' it just imports names defined
in the main script *before* a was imported.
In general, don't try to do this: put all your classes into modules and
just put minimal startup code into a script.
More information about the Python-list