python之常量和变量

局部和全局变量：

 # name='lhf'
 # def change_name():
 #     # global name
 #     name='帅了一比'
 #     print('change_name',name)
 #
 #
 # change_name()
 # print(name)

 # name='lhf'
 #
 # def change_name():
 #     name1='帅了一比'
 #     name2='帅了一比'
 #     name3='帅了一比'
 #     print('change_name',name)
 #
 # change_name()
 # globals

 # NAME = "杠娘"
 #
 # def yangjian():
 #     # NAME = "史正文"
 #     global NAME
 #     NAME = "小东北"
 #     print('我要搞', NAME)

 #
 # def qupengfei():
 #     NAME = "基"
 #     print('我要搞', NAME)
 #
 # yangjian()
 # qupengfei()

 # NAME = "产品经理"

 # def yangjian():
 #     # NAME = "史正文"
 #     global NAME # 已经声明，ＮＡＭＥ就是全局的的那个变量
 #     print('我要搞', NAME)
 #     NAME = "小东北"  # 修改 全局的变量
 #     print('我要搞', NAME)

 # def qupengfei():
 #     NAME = "基"
 #     print('我要搞', NAME)

 # 如果函数的内容无global关键字，
 #   - 有声明局部变量
 # NAME = ["产品经理","廖波湿"]
 # def qupengfei():
 #     NAME = "自己"
 #     print('我要搞', NAME)
 # qupengfei()
 #   - 无声明局部变量
 # NAME = ["产品经理","廖波湿"]
 # def qupengfei():
 #     NAME.append('XXOO')
 #     print('我要搞', NAME)
 # qupengfei()

 # 如果函数的内容有global关键字
 #   - 有声明局部变量
 # NAME = ["产品经理","廖波湿"]
 # def qupengfei():
 #     global NAME
 #     NAME = "自己"
 #     print('我要搞', NAME)
 # qupengfei()
         # 错误示例
 # NAME = ["产品经理","廖波湿"]
 # def qupengfei():
 #     NAME = "自己"
 #     global NAME
 #     print('我要搞', NAME)
 # qupengfei()
 #   - 无声明局部变量
 # NAME = ["产品经理","廖波湿"]
 # def qupengfei():
 #     global NAME
 #     NAME = ["阿毛"]
 #     NAME.append('XXOO')
 #     print('我要搞', NAME)
 # qupengfei()

 ######## 全局变量变量名大写
 ######## 局部变量变量名小写

 # 优先读取局部变量，能读取全局变量，无法对全局变量重新赋值 NAME=“fff”，
 #     但是对于可变类型，可以对内部元素进行操作
 # 如果函数中有global关键字，变量本质上就是全局的那个变量，可读取可赋值 NAME=“fff”
 # qupengfei()
 # yangjian()

 NAME = ["产品经理","廖波湿"]

 # def yangjian():
 #     # NAME = "史正文"
 #     global NAME # 已经声明，ＮＡＭＥ就是全局的的那个变量
 #     print('我要搞', NAME)
 #     NAME = "小东北"  # 修改 全局的变量
 #     print('我要搞', NAME)

 # def qupengfei():
 #     # NAME = "aS"
 #     NAME.append('天扎龙')
 #     print('我要搞', NAME)
 #
 # qupengfei()

 # NAME = ["产品经理","廖波湿"]
 # def qupengfei():
 #     name = "自己"
 #     global NAME
 #     print('我要搞', NAME)
 # qupengfei()

 # NAME = '海风'
 #
 # def huangwei():
 #     name = "黄伟"
 #     print(name)
 #     def liuyang():
 #         name = "刘洋"
 #         print(name)
 #         def nulige():
 #             name = '沪指花'
 #             print(name)
 #         print(name)
 #         nulige()
 #     liuyang()
 #     print(name)
 #
 # huangwei()

 # name = "刚娘"
 #
 # def weihou():
 #     name = "陈卓"
 #     def weiweihou():
 #         nonlocal name   # nonlocal，指定上一级变量，如果没有就继续往上直到找到为止
 #         name = "冷静"
 #
 #     weiweihou()
 #     print(name)
 #
 # print(name)
 # weihou()
 # print(name)
 # 刚娘
 # 冷静
 # 刚娘