python if not 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

# To check if a certain element is contained in a list use 'in'
bikes = ['trek', 'redline', 'giant']
'trek' in bikes
# Output:
# True

Example 3: python not in list

>>> 3 not in [2, 3, 4]
False
>>> 3 not in [4, 5, 6]
True

Example 4: python checking not in list

a = [1, 2, 3, 4, 5, 6]
b = 7
c = 4

# use "not in" to check if something is not an element of a list
# use "in" to check if something is an element of a list

if b not in a:
  print('True')
else:
  print('False')

if c in a:
  print('True')
else:
    print('False')

Example 5: how to check an array for a value in python

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