在python中生成所有可能的字符串组合

def generate_combinations(chars, length):
    if length == 0:
        return ['']
    combinations = []
    for char in chars:
        for combination in generate_combinations(chars, length - 1):
            combinations.append(char + combination)
    return combinations

chars = 'abcdefghijklmnopqrstuvwxyz'
length = 3
combinations = generate_combinations(chars, length)
print(combinations)

import itertools

chars = 'abcdefghijklmnopqrstuvwxyz'
length = 3
combinations = [''.join(combination) for combination in itertools.product(chars, repeat=length)]
print(combinations)