IPv6 压缩0

python 代码，IPv6 压缩0

import re

# ipv6 压缩0
def compress_ipv6(ipv6_str):
    # 将IPv6地址分割为各个字段
    arr = ipv6_str.split(":")

    # 处理连续的全0字段
    for i in range(len(arr)):
        if arr[i] == "0000":
            arr[i] = "0"
            continue
        arr[i] = arr[i].lstrip('0')

    # 找到连续的全0字段
    zero_fields = [i for i, part in enumerate(arr) if part == "0"]

    if zero_fields:
        max_zero_length = 1
        current_zero_length = 1
        max_zero_start = zero_fields[0]
        current_zero_start = zero_fields[0]

        for i in range(1, len(zero_fields)):
            if zero_fields[i] == zero_fields[i - 1] + 1:
                current_zero_length += 1
            else:
                if current_zero_length > max_zero_length:
                    max_zero_length = current_zero_length
                    max_zero_start = current_zero_start
                current_zero_start = zero_fields[i]
                current_zero_length = 1

        if current_zero_length > max_zero_length:
            max_zero_length = current_zero_length
            max_zero_start = current_zero_start

        # 替换最长的连续0字段
        arr[max_zero_start:max_zero_start + max_zero_length] = [":"]

    result = ":".join(part for part in arr if part)  # 去除空字段
    return result.replace(":::", "::")

# 示例
ipv6_str = "2001:0000:0000:0042:0000:0000:0370:7334"
result = compress_ipv6(ipv6_str)
print(result)

1. 将 IPv6 地址分割为各个字段
2. 将每一个字段的多余的 0 去除，四个 0 的字段由一个 0 代替
3. 找到只有 0 的字段位置
4. 找到最长的连续 0 的连续字段
5. 最长的连续 0 的连续字段由一个:代替
6. 将处理过的各个字段用:拼接
7. 因为我们将连续的 0 转为了:，所以会出现三个冒号的情况，将三个冒号转为两个冒号即可