functions.py

a = 4 
b = 23
sum = a + b
print(sum)

# function definition
def calc_sum(a, b): # parameters
    return a + b
sum = calc_sum(1, 2) #function call; arguments
print(sum)
# # more lines of code 
# a = 4
# b = 10
# sum = a + b
# print(sum) # again we rewrite the logic for the same task

# we are redundant the code, which is not good in coding 

def calcSum(x, y):

    sum = x + y
    print(sum)
    return sum

# how we call the function 

calcSum(3, 7)
calcSum(4, 3)
calcSum(36, 6) 
# now we decrease the redundant by using the function 
# we use functions to reduce the redundancy form the code 

def my_function():
    print("hello from asfar")

my_function()

def fahrenheit_to_celsius(fahrenheit):
    return(fahrenheit - 32)  * 5 / 9

print(fahrenheit_to_celsius(77))


def get_greeting():
    return "Hello Everyone"

message = get_greeting()
print(message)

def my_function(fname):
    print(fname + "Refsnes")
my_function("Ismail")
my_function("ahmad")

# default parameter values 

def greet(name = "friend"):
    print("hello", name)

greet("asfar")
greet()


def name_of_animal(animal, name): 
    print("I have  a", animal)
    print(f"M {animal}'s name is {name}")

name_of_animal(animal="dog", name= "jack")