input: Write a function to check if an element exists within a given list of integers. The function should take an element and a list of integers as parameters and return True if the element is in the list, otherwise return False.
  def element_exists(elem, list_int):
    return elem in list_int
  
  assert element_exists(3, [1, 2, 3, 4, 5]) == True
  assert element_exists(6, [1, 2, 3, 4, 5]) == False
  assert element_exists(0, []) == False
output: def element_exists(elem, list_int):
    return elem in list_int