2.3.9.1 Modules
The only special operation on a module is attribute access: m.name,
where m is a module and name accesses a name defined in m's
symbol table. Module attributes can be assigned to. (Note that the import
statement is not, strictly speaking, an operation on a module object; import foo
does not require a module object named foo to exist, rather it requires an
(external) definition for a module named foo somewhere.)
A special member of every module is __dict__. This is the
dictionary containing the module's symbol table. Modifying this dictionary will actually
change the module's symbol table, but direct assignment to the __dict__
attribute is not possible (you can write m.__dict__['a'] = 1,
which defines m.a to be 1, but you can't write m.__dict__
= {}).
Modules built into the interpreter are written like this: <module 'sys'
(built-in)>. If loaded from a file, they are written as <module 'os'
from '/usr/local/lib/python2.3/os.pyc'>.
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