Top 50 Python Programs
hello_world.py
# Python program to print "Hello, World!"
print("Hello, World!")
Last Modified: January 11, 2025 23:35:26
swap_two_numbers.py
# Program to swap two numbers
a = 5
b = 10
# Before swapping
print("Before swapping:")
print("a =", a)
print("b =", b)
# Swapping
a, b = b, a
# After swapping
print("\nAfter swapping:")
print("a =", a)
print("b =", b)
Last Modified: January 12, 2025 00:06:45
check_prime.py
# Program to check if a number is prime
def is_prime(num):
if num < 2:
return False
for i in range(2, num):
if num % i == 0:
return False
return True
num = int(input("Enter a number: "))
if is_prime(num):
print(f"{num} is a prime number.")
else:
print(f"{num} is not a prime number.")
Last Modified: January 12, 2025 00:07:17
largest_of_three.py
# Program to find the largest of three numbers
a = float(input("Enter first number: "))
b = float(input("Enter second number: "))
c = float(input("Enter third number: "))
if a >= b and a >= c:
largest = a
elif b >= a and b >= c:
largest = b
else:
largest = c
print(f"The largest number is {largest}")
Last Modified: January 12, 2025 00:07:39
odd_or_even.py
# Program to check if a number is odd or even
num = int(input("Enter a number: "))
if num % 2 == 0:
print(f"{num} is an even number.")
else:
print(f"{num} is an odd number.")
Last Modified: January 12, 2025 00:07:57
armstrong_number.py
# Program to check if a number is an Armstrong number
num = int(input("Enter a number: "))
sum = 0
temp = num
order = len(str(num))
while temp > 0:
digit = temp % 10
sum += digit ** order
temp //= 10
if num == sum:
print(f"{num} is an Armstrong number.")
else:
print(f"{num} is not an Armstrong number.")
Last Modified: January 12, 2025 07:09:13
factorial.py
# Program to find the factorial of a number
num = int(input("Enter a number: "))
factorial = 1
for i in range(1, num + 1):
factorial *= i
print(f"The factorial of {num} is {factorial}.")
Last Modified: January 12, 2025 07:09:25
fibonacci_sequence.py
# Program to generate Fibonacci sequence
n_terms = int(input("Enter the number of terms: "))
a, b = 0, 1
count = 0
if n_terms <= 0:
print("Please enter a positive integer.")
elif n_terms == 1:
print("Fibonacci sequence upto 1 term:")
print(a)
else:
print("Fibonacci sequence:")
while count < n_terms:
print(a)
nth = a + b
a = b
b = nth
count += 1
Last Modified: January 12, 2025 07:09:39
palindrome.py
# Program to check if a number is a palindrome
num = int(input("Enter a number: "))
reverse = 0
temp = num
while temp > 0:
digit = temp % 10
reverse = reverse * 10 + digit
temp //= 10
if num == reverse:
print(f"{num} is a palindrome.")
else:
print(f"{num} is not a palindrome.")
Last Modified: January 12, 2025 07:09:56
count_vowels.py
# Program to count vowels in a string
string = input("Enter a string: ")
vowels = "aeiouAEIOU"
count = 0
for char in string:
if char in vowels:
count += 1
print(f"Number of vowels in the string: {count}")
Last Modified: January 12, 2025 07:10:09
sum_of_digits.py
# Program to find the sum of digits of a number
num = int(input("Enter a number: "))
sum_digits = 0
while num > 0:
sum_digits += num % 10
num //= 10
print(f"Sum of digits: {sum_digits}")
Last Modified: January 12, 2025 07:10:27
count_words.py
# Program to count words in a string
string = input("Enter a string: ")
words = string.split()
print(f"Number of words: {len(words)}")
Last Modified: January 12, 2025 07:10:41
factorial_recursive.py
# Program to find the factorial of a number using recursion
def factorial(n):
if n == 0 or n == 1:
return 1
else:
return n * factorial(n - 1)
num = int(input("Enter a number: "))
print(f"The factorial of {num} is {factorial(num)}.")
Last Modified: January 12, 2025 07:10:58
reverse_string.py
# Program to reverse a string
string = input("Enter a string: ")
reversed_string = string[::-1]
print(f"Reversed string: {reversed_string}")
Last Modified: January 12, 2025 07:11:14
leap_year.py
# Program to check if a year is a leap year
year = int(input("Enter a year: "))
if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
print(f"{year} is a leap year.")
else:
print(f"{year} is not a leap year.")
Last Modified: January 12, 2025 07:11:26
gcd.py
# Program to find the greatest common divisor (GCD) of two numbers
def gcd(a, b):
while b:
a, b = b, a % b
return a
num1 = int(input("Enter the first number: "))
num2 = int(input("Enter the second number: "))
print(f"The GCD of {num1} and {num2} is {gcd(num1, num2)}.")
Last Modified: January 12, 2025 07:11:38
lcm.py
# Program to find the least common multiple (LCM) of two numbers
def lcm(a, b):
return abs(a * b) // gcd(a, b)
num1 = int(input("Enter the first number: "))
num2 = int(input("Enter the second number: "))
print(f"The LCM of {num1} and {num2} is {lcm(num1, num2)}.")
Last Modified: January 12, 2025 07:11:52
bubble_sort.py
# Program to implement bubble sort
def bubble_sort(arr):
n = len(arr)
for i in range(n):
for j in range(0, n - i - 1):
if arr[j] > arr[j + 1]:
arr[j], arr[j + 1] = arr[j + 1], arr[j]
arr = list(map(int, input("Enter the elements separated by space: ").split()))
bubble_sort(arr)
print("Sorted array:", arr)
Last Modified: January 12, 2025 07:12:08
insertion_sort.py
# Program to implement insertion sort
def insertion_sort(arr):
for i in range(1, len(arr)):
key = arr[i]
j = i - 1
while j >= 0 and key < arr[j]:
arr[j + 1] = arr[j]
j -= 1
arr[j + 1] = key
arr = list(map(int, input("Enter the elements separated by space: ").split()))
insertion_sort(arr)
print("Sorted array:", arr)
Last Modified: January 12, 2025 07:12:20
merge_sort.py
# Program to implement merge sort
def merge_sort(arr):
if len(arr) > 1:
mid = len(arr) // 2
left = arr[:mid]
right = arr[mid:]
merge_sort(left)
merge_sort(right)
i = j = k = 0
while i < len(left) and j < len(right):
if left[i] < right[j]:
arr[k] = left[i]
i += 1
else:
arr[k] = right[j]
j += 1
k += 1
while i < len(left):
arr[k] = left[i]
i += 1
k += 1
while j < len(right):
arr[k] = right[j]
j += 1
k += 1
arr = list(map(int, input("Enter the elements separated by space: ").split()))
merge_sort(arr)
print("Sorted array:", arr)
Last Modified: January 12, 2025 07:12:32
quick_sort.py
# Program to implement quick sort
def quick_sort(arr):
if len(arr) <= 1:
return arr
pivot = arr[len(arr) // 2]
left = [x for x in arr if x < pivot]
middle = [x for x in arr if x == pivot]
right = [x for x in arr if x > pivot]
return quick_sort(left) + middle + quick_sort(right)
arr = list(map(int, input("Enter the elements separated by space: ").split()))
print("Sorted array:", quick_sort(arr))
Last Modified: January 12, 2025 07:12:58
binary_search.py
# Program to implement binary search
def binary_search(arr, target):
left, right = 0, len(arr) - 1
while left <= right:
mid = (left + right) // 2
if arr[mid] == target:
return mid
elif arr[mid] < target:
left = mid + 1
else:
right = mid - 1
return -1
arr = list(map(int, input("Enter the sorted elements separated by space: ").split()))
target = int(input("Enter the number to search: "))
result = binary_search(arr, target)
if result != -1:
print(f"Element found at index {result}")
else:
print("Element not found")
Last Modified: January 12, 2025 07:13:18
count_characters.py
# Program to count characters in a string
string = input("Enter a string: ")
print(f"Number of characters: {len(string)}")
Last Modified: January 12, 2025 07:13:34
remove_duplicates.py
# Program to remove duplicate elements from a list
arr = list(map(int, input("Enter the elements separated by space: ").split()))
unique_arr = list(set(arr))
print(f"List without duplicates: {unique_arr}")
Last Modified: January 12, 2025 07:14:08
decimal_to_binary.py
# Program to convert decimal to binary
num = int(input("Enter a decimal number: "))
binary = bin(num).replace("0b", "")
print(f"Binary representation of {num} is {binary}")
Last Modified: January 12, 2025 07:14:18
binary_to_decimal.py
# Program to convert binary to decimal
binary = input("Enter a binary number: ")
decimal = int(binary, 2)
print(f"Decimal representation of {binary} is {decimal}")
Last Modified: January 12, 2025 07:14:31
ascii_value.py
# Program to find the ASCII value of a character
char = input("Enter a character: ")
print(f"The ASCII value of '{char}' is {ord(char)}")
Last Modified: January 12, 2025 07:14:44
sum_of_n_numbers.py
# Program to calculate sum of first n numbers
n = int(input("Enter a number: "))
sum_numbers = sum(range(1, n + 1))
print(f"Sum of first {n} numbers is {sum_numbers}")
Last Modified: January 12, 2025 07:15:00
matrix_multiplication.py
# Program to multiply two matrices
def multiply_matrices(A, B):
result = [[0, 0], [0, 0]]
for i in range(len(A)):
for j in range(len(B[0])):
for k in range(len(B)):
result[i][j] += A[i][k] * B[k][j]
return result
A = [[1, 2], [3, 4]]
B = [[5, 6], [7, 8]]
result = multiply_matrices(A, B)
for row in result:
print(row)
Last Modified: January 12, 2025 07:15:13
count_occurrences.py
# Program to count occurrences of an element in a list
arr = list(map(int, input("Enter the elements separated by space: ").split()))
target = int(input("Enter the element to count: "))
print(f"The element {target} appears {arr.count(target)} times.")
Last Modified: January 12, 2025 07:15:35
simple_interest.py
# Program to calculate simple interest
P = float(input("Enter principal amount: "))
R = float(input("Enter rate of interest: "))
T = float(input("Enter time in years: "))
SI = (P * R * T) / 100
print(f"Simple interest is {SI}")
Last Modified: January 12, 2025 07:15:46
compound_interest.py
# Program to calculate compound interest
P = float(input("Enter principal amount: "))
R = float(input("Enter rate of interest: "))
T = float(input("Enter time in years: "))
N = float(input("Enter the number of times interest is compounded: "))
A = P * (1 + R / (N * 100)) ** (N * T)
CI = A - P
print(f"Compound interest is {CI}")
Last Modified: January 12, 2025 07:16:22
pattern1.py
# Program to print a pattern of stars
n = int(input("Enter the number of rows: "))
for i in range(1, n + 1):
print('*' * i)
Last Modified: January 12, 2025 07:16:34
pattern2.py
# Program to print a reverse pattern of stars
n = int(input("Enter the number of rows: "))
for i in range(n, 0, -1):
print('*' * i)
Last Modified: January 12, 2025 07:16:46
sum_of_even_numbers.py
# Program to find the sum of even numbers up to n
n = int(input("Enter a number: "))
sum_even = sum([i for i in range(2, n + 1, 2)])
print(f"Sum of even numbers up to {n} is {sum_even}")
Last Modified: January 12, 2025 07:17:00
sum_of_odd_numbers.py
# Program to find the sum of odd numbers up to n
n = int(input("Enter a number: "))
sum_odd = sum([i for i in range(1, n + 1, 2)])
print(f"Sum of odd numbers up to {n} is {sum_odd}")
Last Modified: January 12, 2025 07:17:11
reverse_number.py
# Program to reverse a number
num = int(input("Enter a number: "))
reverse = 0
while num > 0:
reverse = reverse * 10 + num % 10
num //= 10
print(f"Reversed number is {reverse}")
Last Modified: January 12, 2025 07:17:21
hcf.py
# Program to find the highest common factor (HCF) of two numbers
def hcf(a, b):
while b:
a, b = b, a % b
return a
num1 = int(input("Enter the first number: "))
num2 = int(input("Enter the second number: "))
print(f"The HCF of {num1} and {num2} is {hcf(num1, num2)}.")
Last Modified: January 12, 2025 07:17:32
factors.py
# Program to find all factors of a number
num = int(input("Enter a number: "))
factors = []
for i in range(1, num + 1):
if num % i == 0:
factors.append(i)
print(f"Factors of {num} are: {factors}")
Last Modified: January 12, 2025 07:17:43
count_digits.py
# Program to count digits in a number
num = int(input("Enter a number: "))
count = len(str(num))
print(f"Number of digits in {num} is {count}")
Last Modified: January 12, 2025 07:17:58
temp_conversion.py
# Program to convert Celsius to Fahrenheit
C = float(input("Enter temperature in Celsius: "))
F = (C * 9/5) + 32
print(f"{C}°C is equal to {F}°F")
Last Modified: January 12, 2025 07:18:10
sum_of_natural_numbers.py
# Program to calculate sum of natural numbers
n = int(input("Enter a number: "))
sum_natural = n * (n + 1) // 2
print(f"Sum of first {n} natural numbers is {sum_natural}")
Last Modified: January 12, 2025 07:18:22
even_odd.py
# Program to check if a number is even or odd
num = int(input("Enter a number: "))
if num % 2 == 0:
print(f"{num} is even")
else:
print(f"{num} is odd")
Last Modified: January 12, 2025 07:18:31
sum_of_squares.py
# Program to find the sum of squares of first n numbers
n = int(input("Enter a number: "))
sum_squares = sum([i ** 2 for i in range(1, n + 1)])
print(f"Sum of squares of first {n} numbers is {sum_squares}")
Last Modified: January 12, 2025 07:18:43
string_length.py
# Program to find the length of a string
string = input("Enter a string: ")
print(f"Length of the string is {len(string)}")
Last Modified: January 12, 2025 07:18:56
string_reverse.py
# Program to reverse a string
string = input("Enter a string: ")
print(f"Reversed string: {string[::-1]}")
Last Modified: January 12, 2025 07:19:24
string_palindrome.py
# Program to check if a string is palindrome
string = input("Enter a string: ")
if string == string[::-1]:
print(f"{string} is a palindrome")
else:
print(f"{string} is not a palindrome")
Last Modified: January 12, 2025 07:19:36
gcd_recursive.py
# Program to find GCD using recursion
def gcd(a, b):
if b == 0:
return a
return gcd(b, a % b)
a = int(input("Enter the first number: "))
b = int(input("Enter the second number: "))
print(f"GCD of {a} and {b} is {gcd(a, b)}")
Last Modified: January 12, 2025 07:19:47
lcm_recursive.py
# Program to find LCM using recursion
def lcm(a, b):
return abs(a * b) // gcd(a, b)
a = int(input("Enter the first number: "))
b = int(input("Enter the second number: "))
print(f"LCM of {a} and {b} is {lcm(a, b)}")
Last Modified: January 12, 2025 07:20:00
multiply_list.py
# Program to multiply all elements in a list
arr = list(map(int, input("Enter the elements separated by space: ").split()))
result = 1
for num in arr:
result *= num
print(f"Multiplication of all elements is {result}")
Last Modified: January 12, 2025 07:20:13