Python Global Keyword

In this article, you will learn a lot about important international roles, the world, and the use of an important global keyword.

Table of Contents

• Python global Keyword
• Rules of global Keyword
• Use of global Keyword (With Example)
• Global Variables Across Python Modules
• Global in Nested Functions in Python

Before reading this article, be sure to have some of the Global Python foundations inside and outside.

Python global Keyword:

In Python, the important international word allows the change of variables outside of the scope of today. It is used to make global variables and variables to create a change in the environmental situation.

Rules of global Keyword:

Basic rules for the keyword in Python are:

• If we make changes to work, which is at a level.

• If a variable is left out of the operation, which is an international standard. You should not use the important international word.

• We use words that are keywords for reading and writing across the globe through international staff.

• Use the important international agenda items to deal with

Use of global Keyword (With Example):

Let's take an example.

Example 1: Accessing global Variable From Inside a Function

c = 1 # global variable

def add():

    print(c)

add()

When we implement the old program, productivity will be:

1

However, we can have several behaviors that we have to make a big difference in the world.

Example 2: Modifying Global Variable From Inside the Function

c = 1 # global variable  

def add():

    c = c + 2 # increment c by 2

    print(c) 

add()

When we implement the old program, the result shows the error:

UnboundLocalError: local variable 'c' referenced before assignment

This is because we can only access global variables, but can not change internal processing.

The world's most important solution to keywords.

Example 3: Changing Global Variable From Inside a Function using global

c = 0 # global variable

def add():

    global c

    c = c + 2 # increment by 2

    print("Inside add():", c)

add()

print("In main:", c)

When we implement the old program, productivity will be:

Inside add(): 2

In main: 2

The first program we made was how the world's key elements in the add () function work.

Then, the lowest value is c 1, c = c + 2. Then, we call an action (). Finally, we consider global change c.

As we have seen, the trends have also affected international outcomes over the work, c = 2.

Global Variables Across Python Modules:

In Python, we create one module to configure global variable config.py and share information through the Python module in the same program.

Here's how we can share global variables through Python methods.

Example 4: Share a global Variable Across Python Modules

Make config.py files, to store global variables

a = 0

b = "empty"

Create an update.py file, change a global variable

import config

config.a = 10

config.b = "alphabet"

Make the main.py file, to test the price change

import config

import update

print(config.a)

print(config.b)

When we download the main.py file, the product will be

10

alphabet

Above, we run three files: config.py, update.py main.py.

The Config.py section stores a general trend and b. Update.py in the file, which provides the config.py method and retains a and b value. Also, the main.py file will release parts and update.py config.py. Finally, the value of international print media is analyzed, and whether it is changed or not changed.

Global in Nested Functions in Python:

Here is how you can use global variables that work in the ongoing activities.

Example 5: Using a Global Variable in Nested Function

def foo():

    x = 2

    def bar():

        global x

        x = 25

    print("Before calling bar: ", x)

    print("Calling bar now")

    bar()

    print("After calling bar: ", x)

foo()

print("x in main : ", x)

When we implement the old program, productivity will be:

Before calling bar: 20

Calling bar now

After calling bar: 20

x in main: 25

In the first program, we call the global variable (function) (). The movement off (), x has an important international influence.

Before and after the call block (), the variable x takes a value, the variables in the x = 20. External f (), variable x will receive the value defined by a (), x = 25. This is the reason we used the variables of the keywords x in the production of the international workplace () (the area boundaries).

If we make changes to all the bar () function, this change seems to be fast, that is, foo ().

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