input: 
  def construct_student_marks():
      """ Construct a python dictionary containing student names and marks as key-value pairs.
      >>> construct_student_marks() == {
      ...     "John" : 90, 
      ...     "Levi" : 85, 
      ...     "Jill" : 95, 
      ...     "Sara" : 75
      ... }
      True
      """
      student_marks = {
          "John": 90,
          "Levi": 85,
          "Jill": 95,
          "Sara": 75
      }
      return student_marks
  
output:     student_marks = {
          "John": 90,
          "Levi": 85,
          "Jill": 95,
          "Sara": 75
      }
      return student_marks