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Python | cmp() function
• Difficulty Level : Basic
• Last Updated : 24 Apr, 2020

cmp() method in Python 2.x compares two integers and returns -1, 0, 1 according to comparison.
cmp() does not work in python 3.x. You might want to see list comparison in Python.

```Syntax:
cmp(a, b)
Parameters:
a and b are the two numbers in which the comparison is being done.
Returns:
-1 if a<b

0 if a=b

1 if a>b
```
 `# Python program to demonstrate the ``# use of cmp() method`` ` `# when ab ``a ``=` `3``b ``=` `2` `print``(``cmp``(a, b))`

Output:

```-1
0
1
```

Practical Application: Program to check if a number is even or odd using cmp function.

Approach: Compare 0 and n%2, if it returns 0, then it is even, else its odd.

Below is the Python implementation of the above program:

 `# Python program to check if a number is  ``# odd or even using cmp function  ``   ` `# check 12  ``n ``=` `12` `if` `cmp``(``0``, n ``%` `2``):  ``    ``print``"odd"``else``: ``    ``print``"even"` `       ` `# check 13     ``n ``=` `13` `if` `cmp``(``0``, n ``%` `2``):  ``    ``print``"odd"``else``: ``    ``print``"even"`

Output:

```even
odd
```

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