Python return语句错误“'return'外部函数”

Question

When running the following code (in Python 2.7.1 on a mac with Mac OS X 10.7)

while True:
    return False

I get the following error

SyntaxError: 'return' outside function

I've carefully checked for errant tabs and/or spaces. I can confirm that the code fails with the above error when I use the recommended 4 spaces of indentation. This behavior also happens when the return is placed inside of other control statements (eg if, for, etc.).

Any help would be appreciated. Thanks!

Answer 1

The return statement only makes sense inside functions:

def foo():
    while True:
        return False

Answer 2

Use quit() in this context. break expects to be inside a loop, and return expects to be inside a function.

Answer 3

To break a loop, use break instead of return .

Or put the loop or control construct into a function, only functions can return values.

Answer 4

As per the documentation on the return statement, return may only occur syntactically nested in a function definition. The same is true for yield .