Summary of global keyword function definition and usage

This article mainly introduces to you the relevant information about the declaration and analysis of the keywords nonlocal and global in Python. The introduction in the article is very detailed. I believe it has certain reference value for everyone. Friends who need it can read it together. Take a look. 1. Global and nonlocal declarations in Python are as follows: a = 10 ​ def foo(): When a = 100 executes foo(), the result a is still the assignment to the variable in the 10 function. The variable is always bound to the local namespace of the function. This behavior can be changed using the global statement. >>> a 10 >>> def foo(): ... global a ... a 

1. Detailed analysis of nonlocal and global

Introduction: This article mainly introduces to you the relevant information about the declaration and analysis of the keywords nonlocal and global in Python. The introduction in the article is very detailed. I believe it has certain reference value for everyone. Friends who need it Let’s take a look below.

2. Introduction to the declaration and parsing of the keywords nonlocal and global in Python

Introduction: This article mainly introduces you to the relevant information about the declaration and analysis of the keywords nonlocal and global in Python. The introduction in the article is very detailed. I believe it has certain reference value for everyone. Friends who need it can come and take a look below.

3. Python nonlocal and global keyword parsing instructions

##Introduction: This article introduces the explanation of Python nonlocal and global keyword parsing

4. Why the global array cannot be used in the event callback function of swoole ?

Introduction: As shown in the figure, the array explicitly declared in the top-level scope cannot be called in the callback function of the onmessage event, and is reused every time. Create a new array and then perform the operation. I tried the global keyword and it didn't work. Also adding the & reference symbol in front of the variable in use didn't work either. This...

5. Global keyword and $GLOBALS usage in PHP

Introduction:: This article mainly introduces the global keyword and $GLOBALS usage in PHP. Students who are interested in PHP tutorials can refer to it.

6. Learn php step by step to learn PHP4 php function supplement 2

Introduction: learn php: learn php step by step Learn PHP4 PHP function in one step Supplement 2: 1. Solve the scope problem In the previous section, we talked about the scope problem of functions in PHP. If classes are not enough to explain the problem, then the scope examples in this article may be helpful to you. more convincing. So, how can we access external variables in PHP functions? In PHP, there is a concept called global scope, which means that if you do not use functions (there will be the concept of classes in the future), then the variables you create can be accessed anywhere on the page. So, how do we solve the problem in the function body? We can use the global keyword:

##7.

PHP global variable global keyword reference interpretation_PHP tutorial

Introduction: Interpretation of the Global keyword reference of PHP global variables. This article will give you a brief introduction to the PHP global variable Global keyword reference. Although the comment is extremely short compared to the article, the principle is explained very clearly and briefly

8.

PHP global keyword, phpglobal keyword_PHP tutorial

Introduction: PHP global keyword, phpglobal keyword. PHP global keyword, phpglobal keyword The global keyword is used to access global variables inside a function. ?php$x = 5;$y = 10;function myTest(){ global $x,$y; $x = $x+$y;}myTest();echo $x

9. [PHP Kernel Learning] Analysis of the parsing process of the global keyword

Introduction: [PHP Kernel Learning] Analysis of the parsing process of the global keyword

10. Global keywords for PHP source code analysis

##Introduction: PHP tutorial

[Related Q&A Recommendations]:

php - Why can't the global array be used in the event callback function of swoole?

When outputting, the result of the comment is always

The above is the detailed content of Summary of global keyword function definition and usage. For more information, please follow other related articles on the PHP Chinese website!