cmp(list1,list2) function does not exist in Python

Question

cmp(list1,list2) is not supported in Python 3.x while it's supported in Python 2.x.Is there any alternative to cmp() function in Python 3.x?

Depending on exactly what you doing / using it for, there's also [`functools.cmp_to_key()`](https://docs.python.org/3/library/functools.html#functools.cmp_to_key). — martineau, Nov 29 '19 at 13:57

score 1 · Accepted Answer · answered Nov 29 '19 at 13:55

As part of the move away from cmp-style comparisons, the cmp() function was removed in Python 3.

If it is necessary (usually to conform to an external API), you can provide it with this code:

def cmp(x, y):
    """
    Replacement for built-in function cmp that was removed in Python 3

    Compare the two objects x and y and return an integer according to
    the outcome. The return value is negative if x < y, zero if x == y
    and strictly positive if x > y.
    """

    return (x > y) - (x < y)

cmp(list1,list2) function does not exist in Python

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