Hackforge Academy

Explanation

Write a Python program to reverse a string using slicing.

Code:

def reverse_string(s):
    return s[::-1]

print(reverse_string("Python"))

Explanation

Write a Python program to calculate the factorial of a number using a loop.

Code:

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

print(factorial(5))

Explanation

Write a Python program to check whether a given number is prime.

Code:

def is_prime(num):
    if num <= 1:
        return False
    for i in range(2, int(num ** 0.5) + 1):
        if num % i == 0:
            return False
    return True

print(is_prime(7))

Explanation

Write a Python program to print the Fibonacci series up to n terms.

Code:

def fibonacci(n):
    a, b = 0, 1
    for _ in range(n):
        print(a, end=" ")
        a, b = b, a + b

fibonacci(10)

Explanation

Write a Python program to count the frequency of each character in a string using a dictionary.

Code:

def count_characters(s):
    freq = {}
    for char in s:
        freq[char] = freq.get(char, 0) + 1
    return freq

print(count_characters("hello"))