反射

getattr,hasattr:  执行，判断

####  反射
# 可以简化代码，操作更加简洁
# 用字符串数据类型的变量名来访问这个变量的值


# # 类 ,静态属性，类方法，静态方法
# 命名空间.xxx 都可以getattr(命名空间,"xxx")
# class Student:
#     def __init__(self):pass
#     def check_course(self):
#         print("check_course")
#     def choose_course(self):
#         print("choose_course")
#
#     def choosed_course(self):
#         print("查看已经选择的课程")
# # 如果创建一个对象，对对象操作多次，会让代码很冗余

class Student:
    name = "stu"
    @classmethod
    def check_course(cls):
        print("查看课程")
    @staticmethod
    def login():
        print("登录")

# s1 = Student()
# print(Student.name)
# 反射查看静态属性
# print(getattr(Student,"name"))
# print(getattr(s1,"name")) # stu

# 反射调用方法：
# getattr(s1,"login")()
# getattr(s1,"check_course")()
# getattr(Student,"check_course")()
# # 登录
# # 查看课程
# # 查看课程

# num = input(">>>")
# getattr(Student,num)()

# num = input(">>>")
# print(hasattr(Student,num))  # True  判断类和对象中是否有该函数，有则返回True
# num = input(">>>")
# print(hasattr(s1,num))
# num = input(">>>")
# if hasattr(s1,num):
#     getattr(s1,num)()
# else:
#     print("报错")

# # 对象
# class A:
#     def __init__(self,name):
#         self.name = name
#
#     def func(self):
#         return "in func"
#
# a = A("aaa")
# print(a.name)
# print(getattr(a,"name"))
# print(getattr(a,"func")())

# # 模块
# import os
# # os.rename("__init__.py","init")
# getattr(os,"rename")("init","__init__.py")
# # getattr(os,"rename")  相当于 os.rename  任何一个函数不加()都相当于内存地址
# def ha():
#     print("ha")
# def he():
#     print("he")
# import sys
# my_file = sys.modules["__main__"]
# getattr(my_file,"he")()
# getattr(my_file,"ha")()

# 反射模块中的内容
# # def ha():
# #     print("ha")
# # def he():
# #     print("he")
# # import sys
# # my_file = sys.modules["__main__"]
# # getattr(my_file,"he")()
# #getattr(my_file,"ha")()


# 反射
# hasattr, getattr
# 类名.名字
     # getattr(类名,"名字")
# 模块名.名字
    # import 模块
    # getattr(模块,"名字")
# 自己文件.名字
    # import sys
    # getattr(sys.modules["__main__"],"名字")

delattr,setattr  删除，修改

class A:
    def __init__(self,name):
        self.name = name

a = A("dudu")
print(a.name)
# a.name = "ssss"
# # print(a.name)

setattr(a,"name","abcd")   # o,name,value   字符串形式，修改内容，很少使用
print(a.name)
# del a.name
# print(a.__dict__)

delattr(a,"name")  # o,name:str
print(a.__dict__)   删除对象属性