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how to use global keyword in python

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Abdullah Bilici answered on May 26, 2022 Popularity 10/10 Helpfulness 1/10

answer how to use global keyword in python

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how to use global keyword in python

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name = "Abdullah" # creates global variable

def func():
  global name # calls the name variable from global scope
  
  name = "Kemal" # Changes name variable

func()
print(name) # global name variable will be changed because of the global keyword

Popularity 10/10 Helpfulness 1/10 Language python

Source: Grepper

Tags: global global-scope keyword python

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Contributed on Sep 04 2022

Abdullah Bilici

0 Answers Avg Quality 2/10

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global keyword python

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# When we create a variable inside a fxn, it is local by default.
# When we define a variable outside of a fxn, it is global by default. You don't have to use global keyword.
# We use global keyword to read and write a global variable inside a function.
# Use of global keyword outside a function has no effect.

#can access a global variable inside a fxn... but cannot modify it (see next)
c = 1 # global variable
def add():
    print(c)
add()           #1

# cannot modify a global variable from inside a fxn
c = 1 # global variable
def add():
    c = c + 2 # increment c by 2
    print(c)
add()       #UnboundLocalError: local variable 'c' referenced before assignment

# declare global keyword, allows fxn to modify global variable
c = 0 # global variable
def add():
    global c
    c = c + 2 # increment by 2
    print("Inside add():", c)
add()
print("In main:", c)
# Inside add(): 2
# In main: 2

# Global in nested function 
# Declared a global variable inside the nested function bar(). 
# Inside foo() function, x has no effect of the global keyword.
# Before and after calling bar(), the variable x takes the value of local variable i.e x = 20
# Outside of the foo() fxn, the variable x will take value defined in the bar() fxn i.e x = 25
def foo():
    x = 20

    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)

# Before calling bar:  20
# Calling bar now
# After calling bar:  20
# x in main:  25

# declare global variable in local scope
artist = "Michael Jackson"

def printer(artist): 
    global internal_var                     #declare global variable within fxn
    internal_var= "Whitney Houston"
    print(artist,"is an artist")

printer(artist) 
printer(internal_var)

# Michael Jackson is an artist
# Whitney Houston is an artist

Popularity 9/10 Helpfulness 4/10 Language python

Source: www.programiz.com

Tags: global gl

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Contributed on Aug 08 2022

Grotesque Gibbon

0 Answers Avg Quality 2/10

python global keyword

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def update_global_variable():
    global my_variable
    my_variable = 10

def print_global_variable():
    print(my_variable)

# Initially, my_variable is not defined
# Calling print_global_variable() will result in an error

update_global_variable()
print_global_variable()  # Output: 10

Popularity 7/10 Helpfulness 2/10 Language python

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Contributed on Sep 12 2023

YOU.com

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Python global Keyword

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-2

c = 1 # global variable

def add():
    print(c)

add()

Popularity 9/10 Helpfulness 1/10 Language python

Source: Grepper

Tags: global gl

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Contributed on May 26 2022

SAMER SAEID

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how to use global keyword in python

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