En Wed, 10 Mar 2010 09:19:29 -0300, PEYMAN ASKARI <paskari...@yahoo.ca>
escribió:
I wanted to know if imported classes are treated differently than
internal classes.
If by 'internal classes' you mean 'classes defined in the main module',
no, they're absolutely the same.
class A():
__init__(self):
pass
and call A, or A() I get something to the effect of <__main__.A
instance at 0xb7f088ac>
but if I call from module_name import A and then call A or A() I get
something to the effect of <module_4.module_4 instance at 0xb7f0882c>
Note that both reprs have the same structure. Both say
<modulename.classname instance at ...>
When you execute `python test_import.py`, the code is executed into a
newly created module called __main__ (not test_import). So __main__ is the
name of the main module, and __main__.A is the full name of the A class
defined in the __main__ module.
In the other case, module_4.module_4 is the full name of the module_4
class defined in the module_4 module.
I was wondering if this would be a problem.
In general, no, you shouldn't care. There is a problem, though, if some
other module imports the main one (using `import test_import`). Python
knows the main one as "__main__", not as "test_import", so it will load it
*again*, and you'll end with two separate copies of the same module.
Solution: don't do that :) -- redesign your application so subordinate
modules don't have to import the main one (move the required parts into a
third module).
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
