NameError: name 'reduce' is not defined in Python
-
11-04-2021 - |
Question
I'm using Python 3.2. Tried this:
xor = lambda x,y: (x+y)%2
l = reduce(xor, [1,2,3,4])
And got the following error:
l = reduce(xor, [1,2,3,4])
NameError: name 'reduce' is not defined
Tried printing reduce
into interactive console - got this error:
NameError: name 'reduce' is not defined
Is reduce
really removed in Python 3.2? If that's the case, what's the alternative?
Solution
It was moved to functools
.
OTHER TIPS
You can add
from functools import reduce
before you use the reduce.
Or if you use the six library
from six.moves import reduce
In this case I believe that the following is equivalent:
l = sum([1,2,3,4]) % 2
The only problem with this is that it creates big numbers, but maybe that is better than repeated modulo operations?
you need to install and import reduce from functools
python package
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