check if a value is present in list code example

Example 1: how to check if value is in list python

>>> letters = [a,b,c,d,e]
>>> 'a' in letters:
True

Example 2: python check if list contains value

if value in list:
  #do stuff

#Also to check if it doesn't contain
if value not in list:
  #do stuff

Example 3: 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