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...
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 ...
/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 ...
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 avariable. For example, defadd_numbers():sum =5+4 Here, thesumvariable is created inside thefunction, so it can only be acces...
# 内置命名空间中的函数 def print_builtin(): print("This is a built-in function.") # 全局命名空间中的变量 global_var = "I am a global variable." # 定义一个函数,它有自己的局部命名空间 def my_function(): # 局部命名空间中的变量 local_var = "I am a local variable." # 调用内置命...
Note that filter(function, iterable) is equivalent to [item for item in iterable if function(item)] str.isalpha() Return true if all characters in the string are alphabetic and there is at least one character, false otherwise. 本章小结 ...
For example, if you assign a value to a name inside a function, then that name will have a local Python scope. In contrast, if you assign a value to a name outside of all functions—say, at the top level of a module—then that name will have a global Python scope.Python...
The local variable can be accessed from a function within the function: defmyfunc(): x =300 defmyinnerfunc(): print(x) myinnerfunc() myfunc() Try it Yourself » Global Scope A variable created in the main body of the Python code is a global variable and belongs to the global scope...
LEGB stands for Local -> Enclosing -> Global -> Built-in. Let's learn more about scopes... 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...
def foo(): pass foo # <function foo at 0x7fe70c6424c0>2 函数对象用于赋值语句 将函数名称(所代表的函数对象)用于赋值语句,相当于给函数对象起了一个别名,或者说,用另一个变量和函数对象建立了引用关系。这样,可以进一步理解“名称引用对象”的提法,不论是后来的赋值时的变量名称,还是定义函数时所用的函数...