How to use cmp() in Python 3?

Question

I don't know, why I'm not getting the command cmp() to work

Look at the code:

a = [1,2,3]

b = [1,2,3]

c = cmp(a,b)

print (c)

But I'm getting this kind of error:

Traceback (most recent call last):

  File "G:\Dropbox\Code\a = [1,2,3]", line 3, in <module>

    c = cmp(a,b)

 NameError: name 'cmp' is not defined

[Finished in 0.1s]

Answer 1

As referenced in the remarks, cmp doesn't exist in Python 3. In the event that you truly need it, you could characterize it yourself: 

def cmp(a, b):

    return (a > b) - (a < b) 

which is taken from the first What's New In Python 3.0. It's quite uncommon - however not unfathomable - that it's truly required, however, so you should consider whether it's really the most ideal approach to do whatever it is you're doing.

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