input: Write a function to check if an element exists within a given list of integers. If the element exists in the list, return True; otherwise, return False.
  
  assert element_exists(5, [1, 2, 3, 4, 5]) == True
  assert element_exists(7, [1, 3, 5, 7, 9]) == True
  assert element_exists(4, [2, 6, 8, 10]) == False
  assert element_exists(0, []) == False
output: def element_exists(element, lst):
      return element in lst