Python列表-如何使用dns.resolver.query for循环的域名列表

Question

print (data[1])
ymcacanada.ca
answers = dns.resolver.query(data[1]), 'MX')
traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "dnsresolver.py", line 981, in query
File "dnsresolver.py", line 912, in query
File "dnsresolver.py", line 143, in __init__
dns.resolver.NoAnswer

我期望数据[1]等于"ymccanada"，所以我可以用dns在for循环中调用整个数据列表。解析器查找MX记录。

我得到的是这个错误，当我用url手动运行代码时不会发生。

接下来我要做的是将这些查找写入。csv

这是我到目前为止的代码(不工作!)

import dns
import dns.resolver
import os
import csv
import dns.resolver
file = "domains.txt"
f = open(file)
data = f.read()
f.close
list = []
for url in data:
    answers = dns.resolver.query(url, 'MX')
    for rdata in answers:
        x = [rdata.exchange, rdata.preference]
        print(x)
        list.append([x])

编辑

嘿，这是我的工作代码在它的全部。我相信它可以改进，但我仍然在学习!

import dns
import dns.resolver
import os
import csv
##tested on python 2.7 only
errcountA = 0
errcountMX = 0
listoflists = []
with open("domains.txt") as f:
    for url in f:
        A = []
        MX = []
        url = url.strip()
        try: 
            answers = dns.resolver.query(url, 'A') ##Get the A record
            for rdata in answers:
                A.append(rdata.address) ## Add A Records to list
        except: ## Incase the URL doesnt resolve
            A = "Error resolving"
            errcountA += 1
        try: ##Get the MX record
            answers = dns.resolver.query(url, 'MX')
            for rdata in answers:
                MX.append([rdata.preference, rdata.exchange])
        except: ##incase url doesnt resolver
            MX = "Error resolving"
            errcountMX += 1
        list = [url, MX, A]
        print(list)
        listoflists.append(list)
with open('output.csv', 'wb') as csvfile: ##write the csv file
    writer = csv.writer(csvfile)
    for r in listoflists:
        writer.writerow(r)
print listoflists
print ("There were %e A record errors") %errcountA
print ("There were %f MX record errors") %errcountMX
print ("Done!")

Answer 1

您的url数据包括尾随换行符。使用.strip()从数据中删除任何开头或结尾的空白。试试这个:

with open("domaints.txt") as f:
    for url in f:
        url = url.strip()
        answers = dns.resolver.query(url, 'MX')
        # Continue as before