获取文件中以特定字符串开头的行，并将其与python中的其他字符串进行比较。

Question

要解释我想做什么有点困难，但我会试着把它表达清楚。我想在文件中查找一个字符串( url )，并将其与另一个字符串(在我的代码中命名为' services‘)进行比较，如果文件中的url不包括服务，则需要将所有服务与整个文件进行比较，对该url执行一些操作(从文件中删除多余的url)。我的代码如下所示，但它没有给出正确的结果。我想我的for循环有问题。

def search_service():
   status='Y'
   services = subprocess.Popen("docker-cloud service ps | awk '{print $1}'", shell=True, stdout=subprocess.PIPE)
   for line in iter(services.stdout.readline, ''):
       line=line.replace("\n","")
       with open('nginx.conf') as f:
           for word in f:
              if 'proxy_pass' in word:
                   st=word
           if re.search(line,st):
              status='Y'
           else:
              status='N'
              new=st
   if 'N' in status:
      print(st)           
      #remove_block(st)

我的DockerCloud输出服务的一个示例：

dev-qwerty
test-asdfgh

nginx.conf：

server {
       listen      80;
       server_name     asdfgh-test.example.com;
       location / {
          proxy_pass         http://test-asdfgh-example.io:5002/;
          proxy_redirect     off;

          ##proxy_set_header   Host             $host;
          blah
       }
}

 server {
       listen      80;
       server_name     nginx-dev.example.com;
       location / {
          proxy_pass         http://dev-nginx-example.io:5002/;
          proxy_redirect     off;

          ##proxy_set_header   Host             $host;
          blah
       }
}

server {
       listen      80;
       server_name     qwerty-dev.example.com;
       location / {
          proxy_pass         http://dev-qwerty.io:5106/;
          proxy_redirect     off;

          ##proxy_set_header   Host             $host;
          blah
       }
}  

期望的输出是找出：

proxy_pass         http://dev-nginx-example.io:5002/;

任何帮助都将不胜感激。

Answer 1

你的代码太复杂了，这做了同样的事情，而且更容易阅读：

def search_service():
    services = subprocess.Popen("docker-cloud service ps | awk '{print $1}'", shell=True, stdout=subprocess.PIPE)
    docker_services = []
    for line in iter(services.stdout.readline, ''):
        line=line.replace("\n","")
        docker_services.append(line)

    with open('nginx.conf') as f:
       for word in f:
            if 'proxy_pass' in word:
                unknown = True
                for service in docker_services:
                    if service in word:
                        unknown = False
                        break

                if unknown:
                    print(word.strip())

Answer 2

我不能完全确定我已经理解了你的问题，但是有没有类似的东西呢？

dummy_input_file = 'dummy_file.in' 

with open(dummy_input_file, 'w') as out_file:
    out_file.write("""\
string1
string2
string3""")

expected_sub_strings = ['ing2', 'ing3']

modified_file_name = 'modified_file.out'
with open(dummy_input_file, 'r') as in_file, open(modified_file_name, 'w') as out_file:
    for line in in_file:
        if any(s in line for s in expected_sub_strings):
            out_file.write(line)

with open(modified_file_name, 'r') as in_file:
    print(in_file.read())

打印的内容：

string2
string3