此文主要讨论和总结一下,Python中的变量的作用域(variable scope)。 目的在于,通过代码,图解,文字描述,使得更加透彻的了解,Python中的变量的作用域; 以避免,在写代码过程中,由于概念不清晰而导致用错变量,导致代码出错和变量含义错误等现象。 如有错误,欢迎指正。 解释Python中变量的作用域 Python变量作用域的解释之代码版
1. Scope: • If a variable is assigned inside a def, it is local to that function. • If a variable is assigned in an enclosing def, it is nonlocal to nested functions. • If a variable is assigned outside all defs, it is global to the entire file. • global makes scope ...
Local scope variables are defined inside a function and only accessible within that function. They exist only while the function executes. This example demonstrates local variable behavior. Proper use of locals promotes encapsulation and prevents naming conflicts. local_scope.py def calculate(): # Loc...
/usr/bin/python2.7#File: demo.py#Author: lxw#Time: 2014-09-01number= 5deffunc0():#It's OK to reference.printnumberdeffunc1():#new local variable.number = 10printnumberdeffunc2():#global declaration.globalnumberprintnumber number= 10printnumberprint"Before calling any function, number is ...
PythonScope ❮ PreviousNext ❯ A variable is only available from inside the region it is created. This is calledscope. Local Scope A variable created inside a function belongs to thelocal scopeof that function, and can only be used inside that function. ...
变量作用域(variable scope):变量起作用的代码范围。在Python中,变量自定义开始,直到当前函数或文件结束,都是可以使用的,除非被声明为全局变量或者被更小的作用域内同名变量暂时隐藏。 闭包作用域(enclosing scope):在Python中允许嵌套定义函数,也就是一个函数的定义中可以再定义函数。在内层函数中可以直接使用父函数中...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>>x=1 >>>y=1 >>>scope=vars() >>>scope['x'] 1 vars可以返回全局变量的字典。 locals返回局部变量的字典。 vars函数官方说明 这类“不可见字典”叫做命名空间或者作用域。 除了全局作用域外,每个函数调用都会创建一个新的作用域: ...
Local Scope Whenever you define a variable within a function, its scope lies ONLY within the function. It is accessible from the point at which it is defined until the end of the function and exists for as long as the function is executing (Source). Which means its value cannot be change...
In Python, we can declare variables in three different scopes: local scope, global, and nonlocal scope. A variable scope specifies the region where we can access a variable. For example, def add_numbers(): sum = 5 + 4 Here, the sum variable is created inside the function, so it can...
inner_function()# print the value of the global variableprint(global_var)# call the outer function and print local and nested local variablesouter_function() Run Code Output 10 20 30 In the above example, there are three separate namespaces: the global namespace, the local namespace within ...