Use of “global” keyword in Python

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What I understand from reading the documentation is that Python has a separate namespace for functions, and if I want to use a global variable in that function, I need to use global.

I"m using Python 2.7 and I tried this little test

>>> sub = ["0", "0", "0", "0"]
>>> def getJoin():
...     return ".".join(sub)
...
>>> getJoin()
"0.0.0.0"

It seems things are working fine even without global. I was able to access global variable without any problem.

Am I missing anything? Also, following is from Python documentation:

Names listed in a global statement must not be defined as formal parameters or in a for loop control target, class definition, function definition, or import statement.

While formal parameters and class definition make sense to me, I"m not able to understand the restriction on for loop control target and function definition.

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