Types of Variables

• Python supports 2 types of variables.
  • Global variables
  • Local variables

Global Variables

• The variables which are declared outside of function are called global variables.
• These variables can be accessed in all functions of that module.

Example

a=10
def f1():
  print(a)

def f2():
  print(a)

f1()
f2()

Output

 10
 10

Local Variables

• The variables which are declared inside a function are called local variables.
• Local variables are available only for the function in which we declared it i.e. from outside of function we cannot access.

Example

def f1():
  a=10
  print(a)

def f2():
  print(a)

f1()
f2()

Output

10
NameError: name 'a' is not defined 

Global Keyword

• We can use global keyword for the following 2 purposes:
  • To declare global variable inside function.
  • To make global variable available to the function so that we can perform required modifications.

Example

a=10
def f1():
  a=777
  print(a)

def f2():
  print(a)

f1()
f2()

Output

777 
10

Example

a=10
def f1():
  global a
  a=777
  print(a)

def f2():
  print(a)

f1()
f2()

Output

777
777

Example

def f1():
  a=10
  print(a)

def f2():
  print(a)

f1()
f2()

Output

NameError: name 'a' is not defined

Example

def f1():
  global a
  a=10
  print(a)

def f2():
  print(a)

f1()
f2()

Output

10
10

Note

• If global variable and local variable having the same name then we can access global variable inside a function as follows:

a=10
def f1():
  a=777
  print(a)
  print(globals()['a'])
f1()

Output

777 
10 

Ungraded Questions

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