Error in defining a function that defines another function

Question

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Thank you for investing your time in answering my question. I have a python-3 error in defining a function that defines another function with the following code:

def one():
    def two():
        print("two()")
one()
two()

And error:

Traceback (most recent call last):
  File "C:\Users\homec\AppData\Local\Programs\Python\Python39\test.py", line 60, in <module>
    two()
NameError: name 'two' is not defined

After defining one(), I called one() so I defined two(). Then I called two() so I printed "two()". Then what is the problem here, why is it saying name 'two' is not defined.
Thanks in advance for answering.

Answer 1

The function two just isn't available at the outer/global scope.

See this example on how to define it at the global scope:

In [7]: def one():
    ...:     global two
    ...:     def two():
    ...:         print("two()")
    ...: one()
    ...: two()
two()