GLOBAL VARIABLE PYTHON

GLOBAL VARIALBE
 CASE 1:



 CASE 1

g=90

def local():

    print('inside local',g)

local()

print('global area',g)

output :inside local 90

global area 90

Global var g can be accessed all over the program .inside any function and outside funciton.

 CASE 2:

g=90

def local():

    print('inside local',g)

    g+=10

local()

print('global area',g)

Error: UnboundLocalError: local variable 'g' referenced before assignment

CASE-3

g=90

def local():

    global g

    print('inside local',g)

    g+=10

local()

print('global area',g)

OUTPUT:

inside local 90

global area 100

ITS WORKING  SO TO MODIFY  GLOBAL VAR INSIDE FUNCTION FUNCTION YOU HAVE TO REDCLARE GLOBAL VAR IN FUNCTION .AS global g

CASE-4

g=90

def local():

    global g

    print('inside local',g)

    g+=10

def local1():

    g-=30

    print('inside local1',g)

local()

local1()

print('global area',g)

OUTPUT :

ERROR:line 7, in local1

    g-=30

UnboundLocalError: local variable 'g' referenced before assignment

Again same Error Because g is modifying in local1,but not declared as global .so all function which modifying global var have reclared as Global.