Global vs Local Variables

1. Local Variables

Local variable wo hota hai jo sirf function ke andar accessible hota hai.

def greet():
    message = "Hello from function!"  # local variable
    print(message)

greet()
# print(message)  # Error: message is not defined outside function

2. Global Variables

Global variable program ke kisi bhi part me accessible hota hai.

message = "Hello Global!"  # global variable

def greet():
    print(message)

greet()
print(message)

Output:

Hello Global!
Hello Global!

3. Modifying Global Variables

Function ke andar global variable modify karne ke liye global keyword use hota hai.

count = 0  # global variable

def increment():
    global count
    count += 1
    print("Inside function:", count)

increment()
print("Outside function:", count)

Output:

Inside function: 1
Outside function: 1

4. Local vs Global Example

x = 10  # global

def test():
    x = 5  # local
    print("Inside function:", x)

test()
print("Outside function:", x)

Output:

Inside function: 5
Outside function: 10

Next Step

Ab hum seekhenge Classes & Objects, jisme Python me Object-Oriented Programming ka introduction milega.