python 类和实例

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 class Student(object):
    # 在__init__方法中，将name、score变量属性直接绑定进来
    def __init__(self,name,score):
        self.name=name
        self.score=score
chloe=Student('Chloe',60)
print(chloe.name,chloe.score)   

运行结果：

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数据封装&增加新方法

class Student(object):
    # 在__init__方法中，将name、score变量属性直接绑定进来
    def __init__(self,name,score):
        self.name=name
        self.score=score
    def print_score(self):
        print('%s:%s' % (self.name, self.score))
#     增加新方法
    def get_grade(self):
        if self.score>90:
            return 'A'
        else:
            return 'B'
chloe = Student('Chloe', 60)
print(chloe.print_score())
print(chloe.get_grade())

访问权限

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before

class Student(object):
    # 在__init__方法中，将name、score变量属性直接绑定进来
    def __init__(self,name,score):
        self.name=name
        self.score=score
    def print_score(self):
        print('%s:%s' %(self.name, self.score))
chloe=Student('Chloe',99)
print(chloe.name)

before

after

class Student(object):
  # 在__init__方法中，将name、score变量属性直接绑定进来
  def __init__(self,name,score):
      self.__name=name
      self.__score=score
  def print_score(self):
      print('%s:%s' %(self.__name, self.__score))
chloe=Student('Chloe',99)
print(chloe.__name)

变量被私有了

访问参数、更改参数

class Student1(object):
    def __init__(self,name,gender):
        self.name=name
        self.__gender=gender
    #     允许外部访问
    def get_gender(self):
        return self.__gender
    # 允许外部更改
    def set_gender(self,gender):
        self.__gender=gender
bart=Student1('songjiang','female')
bart=Student1('SJ','male')
print(bart.name,bart.get_gender())

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