how to check if a number is in a list of lists python code example

Example 1: check if list of list python

for item in list_of_lists:
      isinstance(item, list)

Example 2: Check if element in list Python

listA = [item1, item2, item3]
if item4 in listA:
  print('yes, item4 is in the list')
else:
  print('no, item4 is not in the list')