如何将单词用逗号分隔的单个字符串转换为多个字符串？

def split_string(input_string):
    words = input_string.split(",")  # 分割单词
    result = []
    for word in words:
        result.append(word.strip())  # 去除单词两端的空格
    return result

input_string = "word1, word2, word3, word4"
output_list = split_string(input_string)
print(output_list)

['word1', 'word2', 'word3', 'word4']