Variations with repetition

import itertools

def generate_variations(string, length):
    variations = [''.join(comb) for comb in itertools.product(string, repeat=length)]
    return variations

def write_variations_to_file(variations):
    with open('output.txt', 'w') as file:
        for variation in variations:
            file.write(variation + '\n')

# Example usage
string = input("Enter a string of characters: ")
length = int(input("Enter the length: "))

variations = generate_variations(string, length)
write_variations_to_file(variations)

print("Variations have been written to 'output.txt'.")