if number is in array python code example

Example 1: how to check an array for a value in python

s = set(a)
if 7 in s:
  # do stuff

Example 2: python check array exists

array = [1,2,3,4]
exists_2 = 2 in array
print(exists_2) # True
exists_5 = 5 in array
print(exists_5) # False