In the 2.7 tutorial, chapter on modules:

 http://docs.python.org/2/tutorial/modules.html#more-on-modules 

I think the last sentence in this paragraph is incorrect:

"Modules can import other modules. It is customary but not required to place all import statements at the beginning of a module (or script, for that matter). The imported module names are placed in the importing module’s global symbol table."

This is not true:

>>> def foo(): import sys
... 
>>> foo()
>>> sys.path
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'sys' is not defined