Question

我是python语言的新手，它试图开发一个脚本来读取其中包含电子邮件的文件，将不良电子邮件与不良电子邮件分开，然后从源文件中删除该行。我到现在为止了，但是在这里我不知道如何删除已经读过的行

有帮助吗？

import os
with open('/home/klevin/Desktop/python_test/email.txt', 'rw+') as f:
    for line in f.readlines():
        #print line
        domain = line.split("@")[1]


        #print(domain)

        response = os.system("ping -c 1 " + domain)


        if response == 0:
            print(response)
            file1 = open("good_emails.txt","a") 
            file1.write( line ) 

        else:
            print(response)
            file = open("bad_emails.txt","a") 
            file.write( line )

Answer 1

通常，我不希望同时读取和写入文件。所以这就是我要做的：

打开文件进行阅读
循环查看电子邮件并执行您的操作。在下面的注释中，您已经说明只想测试前100封邮件，因此下面的代码现在可以进行测试。
关闭文件
重新打开文件，但这次是在写入模式下，将其截断（丢弃其内容）
将所有剩余（未试用）电子邮件写入文件

这将有效删除所有经过测试的邮件。

代码可能看起来像这样：

import os

emails = []

# Opening the file for reading
with open('email.txt', 'r') as f, open("good_emails.txt", "w") as good, open("bad_emails.txt", "w") as bad:
    emails = f.readlines()

    # Only loop over the first 100 mails
    for line in emails[:100]:
        domain = line.split("@")[1]
        response = os.system("ping -c 1 " + domain)

        if response == 0:
            print(response)
            good.write( line ) 

        else:
            print(response)
            bad.write( line ) 

# Now re-open the file and overwrite it with the correct emails            
with open('email.txt', 'w') as f:
    # Write the remaining emails to the original file
    for e in emails[100:]:
        f.write(e)

Answer 2

不能。这根本不是文件的工作方式，您不能仅从文件中间删除几行。要实现您想要的覆盖或替换文件。

因此，在您的代码中，您将删除原始文件并在其上复制good_email.txt：

import shutil
import subprocess

with open('email.txt', 'r') as original, open("good_emails.txt", "w") as good, open("bad_emails.txt", "w") as bad:
    for line in original:  # no need to readlines()
        domain = line.split("@")[1]
        response = subprocess.call(['ping', '-c', '1', domain])
        if response == 0:
            good.write(line) 
        else:
            bad.write(line)

shutil.copyfile('good_emails.txt', 'emails.txt')

读取行并在读取完成后将其删除

2 个答案: