how to know if a number is lucky number in python code example

Example 1: python check if number

if type(variable) == int or type(variable) == float:
    isNumber = True

Example 2: check if a number is in a list python

5 in [3, 4, 5, 6, 7]
# True

9 in [3, 4, 5, 6, 7]
# False