Write a Python function to calculate the factorial of a number using recursion.

 def factorial(n):
 if n == 0:
 return 1
 else:
 return n * factorial(n-1)

Write a Python function to reverse a string using recursion.

 def reverse_string(string):
 if len(string) == 0:
 return string
 else:
 return reverse_string(string[1:]) + string[0]

Write a Python function to calculate the sum of a list of numbers using recursion.

 def sum_list(numbers):
 if len(numbers) == 0:
 return 0
 else:
 return numbers[0] + sum_list(numbers[1:])

Write a Python function to check if a number is a palindrome using recursion.

 def is_palindrome(n):
 if n < 0:
 n = -n
 if n < 10:
 return True
 else:
 return str(n)[0] == str(n)[-1] and is_palindrome(int(str(n)[1:-1]))

Write a Python function to find the largest element in a list using recursion.

 def find_largest(numbers):
 if len(numbers) == 1:
 return numbers[0]
 else:
 largest = find_largest(numbers[1:])
 return numbers[0] if numbers[0] > largest else largest

Write a Python function to find the length of a list using recursion.

 def find_length(lst):
 if lst == []:
 return 0
 else:
 return 1 + find_length(lst[1:])

Write a Python function to check if a number is even using recursion.

 def is_even(n):
 if n == 0:
 return True
 elif n == 1:
 return False
 else:
 return is_even(n-2)

Write a Python function to find the nth element in the Fibonacci sequence using recursion.

 def fibonacci(n):
 if n == 0:
 return 0
 elif n == 1:
 return 1
 else:
 return fibonacci(n-1) + fibonacci(n-2)

Write a Python function to check if a word is a palindrome using recursion.

 def is_palindrome(word):
 if len(word) < 2:
 return True
 else:
 return word[0] == word[-1] and is_palindrome(word[1:-1])

Write a Python function to find the gcd of two numbers using recursion.

def gcd(a, b):
if b == 0:
return a
else:
return gcd(b, a % b)

Write a Python function to find the lcm of two numbers using recursion.

def lcm(a, b):
return (a * b) // gcd(a, b)

Write a Python function to check if a string is a palindrome using recursion.

def is_palindrome(string):
if len(string) < 2:
return True
else:
return string[0] == string[-1] and is_palindrome(string[1:-1])

Write a Python function to find the nth element of the Pascal's triangle using recursion.

def pascal_triangle(n, row, col):
if col == 0 or col == row:
return 1
else:
return pascal_triangle(n-1, row-1, col-1) + pascal_triangle(n-1, row-1, col)

Write a Python function to find the sum of the digits of a number using recursion.

def sum_digits(n):
if n < 10:
return n
else:
return n % 10 + sum_digits(n // 10)

Write a Python function to find the power of a number using recursion.

def power(base, exponent):
if exponent == 0:
return 1
else:
return base * power(base, exponent-1)

Write a Python function to find the nth term of the harmonic series using recursion.

def harmonic_series(n):
if n == 1:
return 1
else:
return 1/n + harmonic_series(n-1)

Write a Python function to find the sum of the elements in a matrix using recursion.

def sum_matrix(matrix):
if matrix == []:
return 0
else:
return sum(matrix[0]) + sum_matrix(matrix[1:])

Write a Python function to find the sum of the digits of a string using recursion.

def sum_digits(string):
if string == '':
return 0
else:
return int(string[0]) + sum_digits(string[1:])

Write a Python function to find the sum of the elements in a 2D list using recursion.

def sum_2d_list(lst):
if lst == []:
return 0
else:
return sum(lst[0]) + sum_2d_list(lst[1:])

Write a Python function to find the sum of the elements in a nested list using recursion.

def sum_nested_list(lst):
if lst == []:
return 0
else:
return sum(lst[0]) + sum_nested_list(lst[1:])

Conclusion

Hopefully, this was challenging!