1. 需求 将aaabbcddcccccc->a3b2cd2c6

2. 代码

a = 'aaabbcddcccccc'


def test(s):
    result = []
    count = 1
    for index in range(1, len(s)):
        if s[index - 1] == s[index]:
            count += 1
        else:
            result.append(s[index - 1])
            if count != 1:
                result.append(count)
                count = 1
    #   if index == len(s) - 1:
    #       result.append(s[index])
    #       if count != 1:
    #           result.append(count)
    else:
        result.append(s[index])
        if count != 1:
            result.append(count)
    return ''.join([str(i) for i in result])


if __name__ == '__main__':
    print(test(a))