def assignmentToStr(assignment: Assignment):
     deadline = ManageAssignmentsMenu.dateToStr(assignment.getDeadline())
     return str(assignment.getAssignmentId()
                ) + " - " + assignment.getDescription() + " - " + deadline
 def validateAssignment(assignment: Assignment):
     AssignmentValidator.validateId(assignment.getAssignmentId())
     AssignmentValidator.validateDescription(assignment.getDescription())
     AssignmentValidator.validateDeadline(assignment.getDeadline())