# defining function
def greet_user():
    print("Welcome")
# calling the function 
greet_user()

# passing the parameter
def greet_user(username):
    print("Hello ," +username.title())
greet_user('Sam')    

def display_message():
    print("Hello im learning pytjon")
display_message()    

def fav_book(title):
    print("My fav book is "+title.title())
    print("My fav book is "+title.title())
fav_book('David Copper FIeld')    
fav_book('SHerlock Holmes')    