Python Programming

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Python Program to Return Multiple Values From a Function

Example 1: Return values using comma

def name():
    return "John","Armin"
# print the tuple with the returned values
print(name())
# get the individual items
name_1, name_2 = name()
print(name_1, name_2)

Python Program to Return Multiple Values From a Function

Example 2: Using a dictionary

def name():
    n1 = "John"
    n2 = "Armin"
    return {1:n1, 2:n2}
names = name()
print(names)

Python Program to Display the multiplication Table

Source Code

# Multiplication table (from 1 to 10) in Python
num = 12
# To take input from the user
# num = int(input("Display multiplication table of? "))
# Iterate 10 times from i = 1 to 10
for i in range(1, 11):
   print(num, 'x', i, '=', num*i)

Python Program to Multiply Two Matrices

Source Code: Matrix Multiplication using Nested Loop

# Program to multiply two matrices using nested loops
# 3x3 matrix
X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]
# 3x4 matrix
Y = [[5,8,1,2],
    [6,7,3,0],
    [4,5,9,1]]
# result is 3x4
result = [[0,0,0,0],
         [0,0,0,0],
         [0,0,0,0]]
# iterate through rows of X
for i in range(len(X)):
   # iterate through columns of Y
   for j in range(len(Y[0])):
       # iterate through rows of Y
       for k in range(len(Y)):
           result[i][j] += X[i][k] * Y[k][j]
for r in result:
   print(r)

Python Program to Multiply Two Matrices

Source Code: Matrix Multiplication Using Nested List Comprehension

# Program to multiply two matrices using list comprehension
# 3x3 matrix
X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]
# 3x4 matrix
Y = [[5,8,1,2],
    [6,7,3,0],
    [4,5,9,1]]
# result is 3x4
result = [[sum(a*b for a,b in zip(X_row,Y_col)) for Y_col in zip(*Y)] for X_row in X]
for r in result:
   print(r)

Python Program to Find Sum of Natural Numbers Using Recursion

Source Code

# Python program to find the sum of natural using recursive function
def recur_sum(n):
   if n <= 1:
       return n
   else:
       return n + recur_sum(n-1)
# change this value for a different result
num = 16
if num < 0:
   print("Enter a positive number")
else:
   print("The sum is",recur_sum(num))

Python Program to Find Numbers Divisible by Another Number

Source Code

# Take a list of numbers
my_list = [12, 65, 54, 39, 102, 339, 221,]
# use anonymous function to filter
result = list(filter(lambda x: (x % 13 == 0), my_list))
# display the result
print("Numbers divisible by 13 are",result)

Python Program to Count the Number of Occurrence of a Character in String

Example 1: Using a for loop

count = 0
my_string = "Programiz"
my_char = "r"
for i in my_string:
    if i == my_char:
        count += 1
print(count)

Python Program to Count the Number of Occurrence of a Character in String

Example 2: Using method count()

my_string = "Programiz"
my_char = "r"
print(my_string.count(my_char))

Python Program to Count the Number of Digits Present In a Number

Example 1: Count Number of Digits in an Integer using while loop

num = 3452
count = 0
while num != 0:
    num //= 10
    count += 1
print("Number of digits: " + str(count))

Python Program to Count the Number of Digits Present In a Number

Example 2: Using inbuilt methods

num = 123456
print(len(str(num)))

Python Program to Count the Occurrence of an Item in a List

Using count() method

freq = ['a', 1, 'a', 4, 3, 2, 'a'].count('a')
print(freq)

Python Program to Check if a Number is Odd or Even

Source Code

# Python program to check if the input number is odd or even.
# A number is even if division by 2 gives a remainder of 0.
# If the remainder is 1, it is an odd number.
num = int(input("Enter a number: "))
if (num % 2) == 0:
   print("{0} is Even".format(num))
else:
   print("{0} is Odd".format(num))

Python Program to Check Whether a String is Palindrome or Not

Source Code

# Program to check if a string is palindrome or not
my_str = 'aIbohPhoBiA'
# make it suitable for caseless comparison
my_str = my_str.casefold()
# reverse the string
rev_str = reversed(my_str)
# check if the string is equal to its reverse
if list(my_str) == list(rev_str):
   print("The string is a palindrome.")
else:
   print("The string is not a palindrome.")

Python Program to Compute all the Permutation of the String

Example 1: Using recursion

def get_permutation(string, i=0):
    if i == len(string):   	 
        print("".join(string))
    for j in range(i, len(string)):
        words = [c for c in string]
   
        # swap
        words[i], words[j] = words[j], words[i]
   	 
        get_permutation(words, i + 1)
print(get_permutation('yup'))

Python Program to Compute all the Permutation of the String

Example 2: Using itertools

from itertools import permutations
words = [''.join(p) for p in permutations('pro')]
print(words)

Python Program to Check if a Number is Positive, Negative or 0

Source Code: Using if...elif...else

num = float(input("Enter a number: "))
if num > 0:
   print("Positive number")
elif num == 0:
   print("Zero")
else:
   print("Negative number")

Python Program to Check if a Number is Positive, Negative or 0

Source Code: Using Nested if

num = float(input("Enter a number: "))
if num >= 0:
   if num == 0:
       print("Zero")
   else:
       print("Positive number")
else:
   print("Negative number")

Python Program to Display Powers of 2 Using Anonymous Function

Source Code

# Display the powers of 2 using anonymous function
terms = 10
# Uncomment code below to take input from the user
# terms = int(input("How many terms? "))
# use anonymous function
result = list(map(lambda x: 2 ** x, range(terms)))
print("The total terms are:",terms)
for i in range(terms):
   print("2 raised to power",i,"is",result[i])

Python Program to Compute the Power of a Number

Example 1: Calculate power of a number using a while loop

base = 3
exponent = 4
result = 1
while exponent != 0:
    result *= base
    exponent-=1
print("Answer = " + str(result))

Python Program to Compute the Power of a Number

Example 2: Calculate power of a number using a for loop

base = 3
exponent = 4
result = 1
for exponent in range(exponent, 0, -1):
    result *= base
print("Answer = " + str(result))

Python Program to Compute the Power of a Number

Example 3: Calculate the power of a number using pow() function

base = 3
exponent = -4
result = pow(base, exponent)
print("Answer = " + str(result))

Python Program to Print all Prime Numbers in an Interval

Source Code

# Python program to display all the prime numbers within an interval
lower = 900
upper = 1000
print("Prime numbers between", lower, "and", upper, "are:")
for num in range(lower, upper + 1):
   # all prime numbers are greater than 1
   if num > 1:
       for i in range(2, num):
           if (num % i) == 0:
               break
       else:
           print(num)

Python Program to Check Prime Number

Example 1: Using a flag variable

# Program to check if a number is prime or not
num = 29
# To take input from the user
#num = int(input("Enter a number: "))
# define a flag variable
flag = False
# prime numbers are greater than 1
if num > 1:
    # check for factors
    for i in range(2, num):
        if (num % i) == 0:
            # if factor is found, set flag to True
            flag = True
            # break out of loop
            break
# check if flag is True
if flag:
    print(num, "is not a prime number")
else:
    print(num, "is a prime number")

Python Program to Check Prime Number

Example 2: Using a for...else statement

# Program to check if a number is prime or not
num = 407
# To take input from the user
#num = int(input("Enter a number: "))
# prime numbers are greater than 1
if num > 1:
   # check for factors
   for i in range(2,num):
       if (num % i) == 0:
           print(num,"is not a prime number")
           print(i,"times",num//i,"is",num)
           break
   else:
       print(num,"is a prime number")
       
# if input number is less than
# or equal to 1, it is not prime
else:
   print(num,"is not a prime number")

Python Program to Print Output Without a Newline

Using end keyword

# print each statement on a new line
print("Python")
print("is easy to learn.")
# new line
print()
# print both the statements on a single line
print("Python", end=" ")
print("is easy to learn.")