Python Programs

Python Programs Collection

1. Program to add two numbers

a = int(input("Enter first number: "))
b = int(input("Enter second number: "))

sum = a + b

print("Sum =", sum)

2. Program to check whether a number is even or odd

n = int(input("Enter number: "))

if n % 2 == 0:
    print("Even")
else:
    print("Odd")

3. Program to check whether a number is positive, negative or zero

n = int(input("Enter number: "))

if n > 0:
    print("Positive")

elif n < 0:
    print("Negative")

else:
    print("Zero")

4. Program to generate random number between 1 to 100

import random

print("Random number:", random.randint(1, 100))

5. Program to calculate factorial

n = int(input("Enter number: "))

fact = 1

for i in range(1, n + 1):
    fact = fact * i

print("Factorial =", fact)

6. Program to calculate sum of n natural numbers

n = int(input("Enter number: "))

sum = 0

for i in range(1, n + 1):
    sum = sum + i

print("Sum =", sum)

7. Program to calculate average of three numbers

a = int(input("Enter first number: "))
b = int(input("Enter second number: "))
c = int(input("Enter third number: "))

avg = (a + b + c) / 3

print("Average =", avg)

8. Program to calculate sum of digits

n = int(input("Enter number: "))

sum = 0

while n > 0:
    r = n % 10
    sum = sum + r
    n = n // 10

print("Sum of digits =", sum)

9. Program to calculate product of digits

n = int(input("Enter number: "))

product = 1

while n > 0:
    r = n % 10
    product = product * r
    n = n // 10

print("Product of digits =", product)

10. Program to check palindrome number

n = int(input("Enter number: "))

temp = n
rev = 0

while n > 0:
    r = n % 10
    rev = rev * 10 + r
    n = n // 10

if temp == rev:
    print("Palindrome")

else:
    print("Not Palindrome")

11. Program to check Armstrong number

n = int(input("Enter number: "))

temp = n
sum = 0

while n > 0:
    r = n % 10
    sum = sum + (r ** 3)
    n = n // 10

if temp == sum:
    print("Armstrong number")

else:
    print("Not Armstrong number")

12. Program to check prime or composite number

n = int(input("Enter number: "))

count = 0

for i in range(1, n + 1):

    if n % i == 0:
        count = count + 1

if count == 2:
    print("Prime number")

else:
    print("Composite number")

13. Program to find sum of even digits

n = int(input("Enter number: "))

sum = 0

while n > 0:

    r = n % 10

    if r % 2 == 0:
        sum = sum + r

    n = n // 10

print("Sum of even digits =", sum)

14. Program to find product of odd digits

n = int(input("Enter number: "))

product = 1

while n > 0:

    r = n % 10

    if r % 2 != 0:
        product = product * r

    n = n // 10

print("Product of odd digits =", product)

15. Program to display consonants from a string

s = input("Enter string: ")

for ch in s:

    ch = ch.lower()

    if ch not in "aeiou" and ch.isalpha():
        print(ch, end=" ")

16. Program to count vowels in a string

s = input("Enter string: ")

count = 0

for ch in s:

    if ch.lower() in "aeiou":
        count = count + 1

print("Total vowels =", count)

17. Program to count vowels and consonants

s = input("Enter string: ")

vowels = 0
consonants = 0

for ch in s:

    if ch.isalpha():

        if ch.lower() in "aeiou":
            vowels = vowels + 1

        else:
            consonants = consonants + 1

print("Vowels =", vowels)
print("Consonants =", consonants)

18. Program to count first letter repetition

s = input("Enter string: ")

first = s[0]

count = 0

for ch in s:

    if ch == first:
        count = count + 1

print("First letter repeats =", count)

19. Program to check palindrome string

s = input("Enter string: ")

rev = ""

for ch in s:
    rev = ch + rev

if s == rev:
    print("Palindrome")

else:
    print("Not Palindrome")

20. Program to display alternate capital and small letters

s = input("Enter string: ")

result = ""

for i in range(len(s)):

    if i % 2 == 0:
        result = result + s[i].upper()

    else:
        result = result + s[i].lower()

print("Result =", result)