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python中的常量和變量代碼詳解

更新時(shí)間：2018年07月25日 10:03:34 作者：有猿人

這篇文章主要介紹了python中的常量和變量，通過實(shí)例代碼給大家介紹了局部和全局變量，需要的朋友參考下吧

局部和全局變量：

# name='lhf'
# def change_name():
#   # global name
#   name='帥了一比'
#   print('change_name',name)
#
#
# change_name()
# print(name)
# name='lhf'
#
# def change_name():
#   name1='帥了一比'
#   name2='帥了一比'
#   name3='帥了一比'
#   print('change_name',name)
#
# change_name()
# globals
# NAME = "杠娘"
#
# def yangjian():
#   # NAME = "史正文"
#   global NAME
#   NAME = "小東北"
#   print('我要搞', NAME)
#
# def qupengfei():
#   NAME = "基"
#   print('我要搞', NAME)
#
# yangjian()
# qupengfei()
# NAME = "產(chǎn)品經(jīng)理"
# def yangjian():
#   # NAME = "史正文"
#   global NAME # 已經(jīng)聲明，ＮＡＭＥ就是全局的的那個(gè)變量
#   print('我要搞', NAME)
#   NAME = "小東北" # 修改 全局的變量
#   print('我要搞', NAME)
# def qupengfei():
#   NAME = "基"
#   print('我要搞', NAME)
# 如果函數(shù)的內(nèi)容無global關(guān)鍵字，
#  - 有聲明局部變量
# NAME = ["產(chǎn)品經(jīng)理","廖波濕"]
# def qupengfei():
#   NAME = "自己"
#   print('我要搞', NAME)
# qupengfei()
#  - 無聲明局部變量
# NAME = ["產(chǎn)品經(jīng)理","廖波濕"]
# def qupengfei():
#   NAME.append('XXOO')
#   print('我要搞', NAME)
# qupengfei()
# 如果函數(shù)的內(nèi)容有g(shù)lobal關(guān)鍵字
#  - 有聲明局部變量
# NAME = ["產(chǎn)品經(jīng)理","廖波濕"]
# def qupengfei():
#   global NAME
#   NAME = "自己"
#   print('我要搞', NAME)
# qupengfei()
    # 錯(cuò)誤示例
# NAME = ["產(chǎn)品經(jīng)理","廖波濕"]
# def qupengfei():
#   NAME = "自己"
#   global NAME
#   print('我要搞', NAME)
# qupengfei()
#  - 無聲明局部變量
# NAME = ["產(chǎn)品經(jīng)理","廖波濕"]
# def qupengfei():
#   global NAME
#   NAME = ["阿毛"]
#   NAME.append('XXOO')
#   print('我要搞', NAME)
# qupengfei()
######## 全局變量變量名大寫
######## 局部變量變量名小寫
# 優(yōu)先讀取局部變量，能讀取全局變量，無法對(duì)全局變量重新賦值 NAME=“fff”，
#   但是對(duì)于可變類型，可以對(duì)內(nèi)部元素進(jìn)行操作
# 如果函數(shù)中有g(shù)lobal關(guān)鍵字，變量本質(zhì)上就是全局的那個(gè)變量，可讀取可賦值 NAME=“fff”
# qupengfei()
# yangjian()
NAME = ["產(chǎn)品經(jīng)理","廖波濕"]
# def yangjian():
#   # NAME = "史正文"
#   global NAME # 已經(jīng)聲明，ＮＡＭＥ就是全局的的那個(gè)變量
#   print('我要搞', NAME)
#   NAME = "小東北" # 修改 全局的變量
#   print('我要搞', NAME)
# def qupengfei():
#   # NAME = "aS"
#   NAME.append('天扎龍')
#   print('我要搞', NAME)
#
# qupengfei()
# NAME = ["產(chǎn)品經(jīng)理","廖波濕"]
# def qupengfei():
#   name = "自己"
#   global NAME
#   print('我要搞', NAME)
# qupengfei()
# NAME = '海風(fēng)'
#
# def huangwei():
#   name = "黃偉"
#   print(name)
#   def liuyang():
#     name = "劉洋"
#     print(name)
#     def nulige():
#       name = '滬指花'
#       print(name)
#     print(name)
#     nulige()
#   liuyang()
#   print(name)
#
# huangwei()
# name = "剛娘"
# 
# def weihou():
#   name = "陳卓"
#   def weiweihou():
#     nonlocal name  # nonlocal，指定上一級(jí)變量，如果沒有就繼續(xù)往上直到找到為止
#     name = "冷靜"
# 
#   weiweihou()
#   print(name)
# 
# print(name)
# weihou()
# print(name)
# 剛娘
# 冷靜
# 剛娘

總結(jié)

以上所述是小編給大家介紹的python中的常量和變量代碼詳解，希望對(duì)大家有所幫助，如果大家有任何疑問請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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