Question

I have searched the SO before I post this question here and hopefully
this is not a duplicated one.

def print_me():
    a_list = range(1, 10)
    for idx, aa in enumerate(a_list):
        pass
    print(idx)

if __name__ == '__main__' : print_me()

Output is as follows:

8

I came from C++ world and could not figure out why idx is still in the scope when
the code is out side of for loop?

Thank you

Answer 1

for loop doesn’t create any scope. This is the reason.

In this particular code idx is a local variable of the print_me function.

From the docs:

The following are blocks:

• a module
• a function body
• a class definition

Update

Generator expressions have their own scopes too.

As of Python 3.0 list comprehensions also have their own scopes.