NameError: global name 'reduce' is not defined

Question

I’m new to Python. Would you please tell me what’s wrong with the following code? When I run it, I got an error message of “NameError: global name ‘reduce’ is not defined”. I asked Goolge but it’s useless. 🙁

def main():
    def add(x,y): return x+y
    reduce(add, range(1, 11))

if __name__=='__main__':
    main()

Asked By: anhldbk

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Source

Answer 1

I’m going to guess that:

You are using Python 3, and
You are following a tutorial designed for Python 2.

The reduce function, since it is not commonly used, was removed from the built-in functions in Python 3. It is still available in the functools module, so you can do:

import functools

def main():
    def add(x,y): return x+y
    functools.reduce(add, range(1, 11))

Answered By: Greg Hewgill

Answer 2

Also

# Import reduce from functools
from functools import reduce

Allows you to use reduce as though it were a built in function.

def main():
    def add(x,y): return x+y
    reduce(add, range(1, 11))

Answered By: chim

NameError: global name 'reduce' is not defined

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