امثلة بايثون python examples functions

#write a python program, to define a function and call it back
def say_hello():
   # block belonging to the function
   print('hello world')
   # End of function

say_hello() # call the function
say_hello() # call the function again

#this program is to explain the idea of default argument(parameter)

def say(message, times=1):
    print(message * times)




say('Hello')
say('World', 5)

x = 50
def func():
    global x
    print('x is', x)
    x = 2
    print('Changed global x to', x)

func()
print('Value of x is', x)

#this code is to explain the principle of local variables
x = 50
def func(x):
    print('x is', x)
    x = 2
    print('Changed local x to', x)
print(x)
func(f)
print('x is still', x)

def func(a, b=5, c=10):
    print('a is', a, 'and b is', b, 'and c is', c)




func(3, 7)
func(25, c=24)
func(c=50, a=100)

#this program do the following: define a function with parameters then call it

def print_max(a, b):
    if a > b:
        print(a, 'is maximum')
    elif a == b:
        print(a, 'is equal to', b)
    else:
        print(b, 'is maximum')



# directly pass literal values
print_max(3, 4)

x = 5
y = 7
# pass variables as arguments
print_max(x, y)

def maximum(x, y):
    if x > y:
        return x
    elif x == y:
        return 'The numbers are equal'
    else:
        return y



print(maximum(2, 3))

#write python program that prompts user to enter the color of traffic light, and then acts upon it.
def guessLight(l):
    if l == 'red':
        print('stop')
    elif l == 'yellow':
        print('Slow down')
    elif l == 'green':
        print('go')
    else:
        print('invalid entry, Choose between red, green, and yellow.')



light = input('please enter the color of traffic light')

guessLight(light.lower())

'''Exercise 1: Write a function f that computes f(x) where f(x) = x^3 - x + 1. (2 solutions 
are expected: with and without calling pow() from cmath library)'''
import cmath
def f(x):
    #i= x ** 3 - x + 1 #without using pow()
    i=pow(x,3)-x+1  #using pow()
    print('the result is ',i)

#Exercise : Write a function g that computes g(x, y) where g(x, y) = x^2 + √2

import math
def g(x , y):
    return x**2 + math.sqrt(y)

print("example: result of g(2,3) is : ",g(2,3))

#create simple calculater و using functions:
def sum(num1,num2):
    return num1+num2

def subtract(num1,num2):
    return num1-num2

def multiply(num1,num2):
    return num1*num2

def divide(num1,num2):
    return num1/num2

def remainder(num1,num2):
    return num1%num2
def power(number,power):
    counter = 1
    result = 1
    while counter <= power:
        result *= number  # same as result=result*n
        counter += 1  # same counter=counter+1
    return result

x=int(input('please enter first number:'))
y=int(input('please enter second number:'))
choice=input("1.summation\n2.subtract\n3.multiply\n4.divide\n5.remainder\n6.power")
if choice=="1":
    print('the summation result is :' , sum(x,y))
elif choice=="2":
    print('the subtraction result is :',subtract(x,y))
elif choice=="3":
    print('the multiplication result is :',multiply(x,y))
elif choice=="4":
    print('the division result is :',divide(x,y))
elif choice == "5":
    print('the remainder result is :', remainder(x, y))
elif choice == "6":
    print('the power result is :',power(x, y))
else:
    print("invalid entry")