check if a certain value exist in a list code example

Example 1: how to check an element in a list in python

thislist = ["apple", "banana", "cherry"]
if "apple" in thislist:
  print("Yes, 'apple' is in the fruits list")

Example 2: how to check an array for a value in python

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