python中直接定义的变量就是本地变量，使用global定义的变量就是全局变量。比如：a = 1b = 1def foo1(): global b #申明使用全局b a = 2 #a是本地变量 b = 2 #b是全局变量foo1()print aprint b 如果解决了您的问题请采纳！如果未解决请继续追问 ...
Global & Local Variable in Python Following code explain how 'global' works in the distinction of global variable and local variable. 1var ='Global Variable'2print(var)34deffunc1():5var ='Local Variable'6print(var)78deffunc2():9print(var)1011deffunc3():12globalvar13print(var)14var ='...
If a name is bound in a block, it is a local variable of that block. If a name is bound at the module level, it is a global variable. (The variables of the module code block are local and global.) If a variable is used in a code block but not defined there, it is a free ...
The message variable is a global variable. It is defined at the global scope, meaning it's defined outside of any function; it's defined at the module level.Assigning to local and global variablesPython also has local variables. Local variables are defined inside of a function, and they ...
利用global关键字进行。 在函数内,如果出现和函数外的变量同名变量,而且对这个变量进行了赋值操作,这个变量是局部变量,只对函数内可见。如果没有赋值操作,函数访问的是函数外的变量,此时如果你修改该变量将会提示报错,提示你在用这个变量前先进行赋值:UnboundLocalError: local variable 'x' referenced before assignment ...
首先，global和local variable只是逻辑上的区分！技术上是一样，都是记录在collection里面，也就是你可以...
x inside :global x outside:global 当我们在函数内部修改x值时报错 UnboundLocalError: local variable 'x' referenced before assignment x ="global" deffoo(): x = x *2 print(x) foo() # 得到错误 UnboundLocalError: local variable 'x' referenced before assignment ...
global 关键字用于在函数内部声明全局变量。当在函数内部使用 global 关键字声明一个变量时，Python 解释器...
Python中两种UnboundLocalError: local variable ‘xxx‘ referenced before assignment情况的解决方法,1)在子程序中对全局变量的操作,比如val=9deftest(flag):ifflag:val=1else:print'Error'returnvaltest(0)错误提示:UnboundLocalError:localvariable'val'referencedb
百度试题 结果1 题目下列哪个是Python中的全局变量关键字? A. local B. global C. variable D. constant 相关知识点: 试题来源: 解析 B 反馈 收藏