1.局部变量与全局变量
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 4 # name='lhf' 5 # def change_name(): 6 # global name 7 # name='帅了一比' 8 # print('change_name',name) 9 # 10 # 11 # change_name() 12 # print(name) 13 14 # name='lhf' 15 # 16 # def change_name(): 17 # name1='帅了一比' 18 # name2='帅了一比' 19 # name3='帅了一比' 20 # print('change_name',name) 21 # 22 # globals 23 24 # NAME = "杠娘" 25 # 26 # def yangjian(): 27 # global NAME 28 # NAME = "小东北" 29 # print('我要搞', NAME) 30 # 31 # def qupengfei(): 32 # NAME = "基" 33 # print('我要搞', NAME) 34 # 35 # yangjian() 36 # qupengfei() 37 38 # NAME = "产品经理" 39 # 40 # def yangjian(): 41 # # NAME = "史正文" 42 # global NAME # 已经声明，ＮＡＭＥ就是全局的的那个变量 43 # print('我要搞', NAME) 44 # NAME = "小东北" # 修改 全局的变量 45 # print('我要搞', NAME) 46 # 47 # def qupengfei(): 48 # NAME = "基" 49 # print('我要搞', NAME) 50 51 # 如果函数的内容无global关键字， 52 # - 有声明局部变量 53 # NAME = ["产品经理","廖波湿"] 54 # def qupengfei(): 55 # NAME = "自己" 56 # print('我要搞', NAME) 57 # qupengfei() 58 # - 无声明局部变量 59 # NAME = ["产品经理","廖波湿"] 60 # def qupengfei(): 61 # NAME.append('XXOO') 62 # print('我要搞', NAME) 63 # qupengfei() 64 65 # 如果函数的内容有global关键字 66 # - 有声明局部变量 67 # NAME = ["产品经理","廖波湿"] 68 # def qupengfei(): 69 # global NAME 70 # NAME = "自己" 71 # print('我要搞', NAME) 72 # qupengfei() 73 # 错误示例 74 # NAME = ["产品经理","廖波湿"] 75 # def qupengfei(): 76 # NAME = "自己" 77 # global NAME 78 # print('我要搞', NAME) 79 # qupengfei() 80 # - 无声明局部变量 81 # NAME = ["产品经理","廖波湿"] 82 # def qupengfei(): 83 # global NAME 84 # NAME = ["阿毛"] 85 # NAME.append('XXOO') 86 # print('我要搞', NAME) 87 # qupengfei() 88 89 ######## 全局变量变量名大写 90 ######## 局部变量变量名小写 91 92 # 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”， 93 # 但是对于可变类型，可以对内部元素进行操作 94 # 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” 95 # qupengfei() 96 # yangjian() 97 98 # NAME = ["产品经理","廖波湿"] 99 # 100 # def yangjian(): 101 # # NAME = "史正文" 102 # global NAME # 已经声明，ＮＡＭＥ就是全局的的那个变量 103 # print('我要搞', NAME) 104 # NAME = "小东北" # 修改 全局的变量 105 # print('我要搞', NAME) 106 # 107 # def qupengfei(): 108 # # NAME = "aS" 109 # NAME.append('天扎龙') 110 # print('我要搞', NAME) 111 # 112 # yangjian() 113 114 # NAME = ["产品经理","廖波湿"] 115 # def qupengfei(): 116 # name = "自己" 117 # global NAME 118 # print('我要搞', NAME) 119 # qupengfei() 120 121 # NAME = '海风' 122 # 123 # def huangwei(): 124 # name = "黄伟" 125 # print(name) 126 # def liuyang(): 127 # name = "刘洋" 128 # print(name) 129 # def nulige(): 130 # name = '沪指花' 131 # print(name) 132 # print(name) 133 # nulige() 134 # liuyang() 135 # print(name) 136 # 137 # huangwei() # 黄伟 刘洋 刘洋 沪指花 黄伟 138 139 # name = "刚娘" 140 # 141 # def weihou(): 142 # name = "陈卓" 143 # def weiweihou(): 144 # 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 145 # name = "冷静" 146 # 147 # weiweihou() 148 # print(name) 149 # 150 # print(name) 151 # weihou() 152 # print(name) 153 # 刚娘 154 # 冷静 155 # 刚娘
2.前向引用
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 4 5 # def foo(): 6 # print('from foo') 7 # bar() 8 # 9 # foo() 10 11 # def bar(): 12 # print('from bar') 13 # def foo(): 14 # print('from foo') 15 # bar() 16 # 17 # foo() 18 19 20 21 # def foo(): 22 # print('from foo') 23 # bar() 24 # 25 # def bar(): 26 # print('from bar') 27 # foo() 28 29 # def foo(): 30 # print('from foo') 31 # bar() 32 # 33 # foo() 34 # 35 # def bar(): 36 # print('from bar')
3.测试
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 name='海风' 4 def huangwei(): 5 name = "黄伟" 6 print(name) 7 def liuyang(): 8 name = "刘洋" 9 print(name) 10 def nulige(): 11 name = '炉指花' 12 print(name) 13 print(name) 14 nulige() 15 liuyang() 16 print(name) 17 18 print(name) 19 huangwei() 20 print(name) # 海风 黄伟 刘洋 刘洋 炉指花 黄伟 海风
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 def calc(n): 4 print(n) 5 if int(n / 2) == 0: # 10/2 5/2 2/2 6 return n 7 res=calc(int(n / 2)) 8 return res 9 10 11 calc(10)# 10 5 2 1
4.递归
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 # def calc(n): 4 # print(n) 5 # if int(n / 2) == 0: 6 # return n 7 # res=calc(int(n / 2)) 8 # return res 9 # 10 # 11 # res=calc(10) 12 # print(res) 13 14 # while True: 15 # print(10) 16 17 # import time 18 # 19 # person_list=['alex','wupeiqi','linhaifeng','zsc'] 20 # def ask_way(person_list): 21 # print('-'*60) 22 # if len(person_list) == 0: 23 # return '根本没人知道' 24 # person=person_list.pop(0) 25 # if person == 'linhaifeng': 26 # return '%s说:我知道,老男孩就在沙河汇德商厦,下地铁就是' %person 27 # 28 # print('hi 美男[%s],敢问路在何方' % person) 29 # print('%s回答道:我不知道,但念你慧眼识猪,你等着,我帮你问问%s...' % (person, person_list)) 30 # time.sleep(1) 31 # res=ask_way(person_list) 32 # 33 # 34 # print('%s问的结果是: %res' %(person,res)) 35 # return res 36 # 37 # res=ask_way(person_list) 38 # print(res) 39 # 我 来英 杨建 是征文 40 # res等沙河 res等沙河 res等 沙河 return ‘沙河’ 41 # print printres 42 43 44 import time 45 res=time.sleep(10) 46 print('----------->')
