交换字符串中的数字

def swap_numbers_in_string(string):
    num_list = []  # 存储字符串中的数字

    # 遍历字符串中的每个字符
    for char in string:
        if char.isdigit():
            num_list.append(char)  # 如果字符是数字，则存储起来

    # 交换数字的过程
    for i in range(0, len(num_list), 2):
        if i + 1 < len(num_list):
            temp = num_list[i]
            num_list[i] = num_list[i + 1]
            num_list[i + 1] = temp

    # 替换原来的数字位置
    num_index = 0
    result = ""
    for char in string:
        if char.isdigit():
            result += num_list[num_index]
            num_index += 1
        else:
            result += char

    return result

# 示例用法
string = "a1b2c3d4e5"
result = swap_numbers_in_string(string)
print(result)  # 输出：b2a1d4c3e5