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...
/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 ...
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 ...
A variable scope specifies the region where we can access avariable. For example, defadd_numbers():sum =5+4 Here, thesumvariable is created inside thefunction, so it can only be accessed within it (local scope). This type of variable is called a local variable. ...
Whenever a variable is defined outside any function, it becomes a global variable, and its scope is anywhere within the program. Which means it can be used by any function. greeting = "Hello" def greeting_world(): world = "World" print(greeting, world) def greeting_name(name): print(...
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...
Define a Function with def 用def定义函数 Call 啊Function with Parentheses :用括号()调用函数 Arguments and Parameters 参数和形参 函数外部称为 argument 参数, 函数内部称为 Paramenters 形参。 None is Useful None可以作为形参 Positional Arguments / Keyword Arguments位置参数/ ...
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. ...
第3 节:用于 Web 开发的不同深度学习 API 入门 本节将说明 API 在软件开发中的一般用法,并说明如何使用不同的最新深度学习 API 来构建智能 Web 应用。 我们将涵盖自然语言处理(NLP)和计算机视觉等领域。 本节包括以下章节: “第 5 章”,“通过 API 进行深度学习” “第 6 章”,“使用 Python 在 Google...
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 ...