Question

对于Essay课我需要存储成绩的属性应该是公共的，并且总是在0.0和4.0之间。我在想的是set_grade（self，grade）但是如何实现if语句以确保它返回4.0之间的数字

class Assessment:

        grade = 0
        def get_grade(self):
        return self.grade

    """This operation is creating a concrete subclass of Assessment"""  
class Essay (Assessment):   

    """This operation is getting the grade the grade for the Essay class which will return a grade"""

        def get_grade(self):
        return self.grade

    """This operation is creating a TeamProject Class with an individual score and a team score grade"""    

class Teamproject(Assessment):

         ind_sc = 0

          ts_sc = 0
    """This operation is getting the grade to individual score and team score and returning the average"""

        def get_grade(self):
        return (self.ind_sc +self.ts_sc) / 2

Answer 1

如何实现if语句以确保它返回4.0之间的数字

试试这个：

  def set_grade(self, grade):
      if grade < 0.0 or grade > 4.0:
          raise ValueError('out of range')
      self.grade = grade

如果您在 Assessent 和 Essay 中使用此功能， TeamScore 也将在境内。

希望这会有所帮助： - ）

Answer 2

if 0.0 <= grade <= 4.0:
    <do something>
else:
    raise ValueError("Error message)

属性Python添加Set值

2 个答案: