题解 | 识别有效的IP地址和掩码并进行分类统计

def is_valid_ip(ip,counter,mask):
    parts = ip.split('.')
    if len(parts)!=4:
        counter[5]+=1
    try: nums = [int(p) for p in parts]
    except:
        counter[5]+=1
        return counter
        return counter
    if nums[0]==0 or nums[0]==127:
        return counter
    if not is_valid_mask(mask):
        counter[5]+=1
        return counter
    for num in nums:
        if num>255 or num<0:
            counter[5]+=1
            return counter
    if nums[0]>=1 and nums[0]<=127:
        if nums[0]==10:
            counter[6]+=1
        counter[0]+=1
    elif nums[0]>=128 and nums[0]<=191:
        if nums[1]==172 and 16<=nums[1]<=31:
            counter[6]+=1
        counter[1]+=1
    elif nums[0]>=192 and nums[0]<=223:
        if nums[0]==192 and nums[1]==168:
            counter[6]+=1
        counter[2]+=1
    elif nums[0]>=224 and nums[0]<=239:
        counter[3]+=1
    elif nums[0]>=240 and nums[0]<=255:
        counter[4]+=1
    return counter

def is_valid_mask(mask):
    parts = mask.split('.')
    if len(parts)!=4:
        return False
    try: parts = [int(p)for p in parts]
    except: return False
    for part in parts:
        if part<0 or part >255:
            return False
    bin_str = ''.join(f'{p:08b}'for p in parts)
    if '01' in bin_str:
        return False
    if bin_str =='1'*32 or bin_str =='0'*32:
        return False
    return True

import sys 
count =[0]*7
for line in sys.stdin.readlines():
    try:ip,mask = line.split('~')
    except: 
        count[5]+=1 
        continue
    count = is_valid_ip(ip,count,mask)
    
print(' '.join(map(str,count)))