相关疑难解决方法(0)

我在学习python时在pip搜索中遇到了这个错误。图片是我pip搜索时的错误。你能告诉我如何解决吗？

$ pip search pdbx
ERROR: Exception:
Traceback (most recent call last):                                                                                                                                                  
  File "*/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 224, in _main                                                
    status = self.run(options, args)                                                                                                                                                
  File "*/lib/python3.7/site-packages/pip/_internal/commands/search.py", line 62, in run                                                    
    pypi_hits = self.search(query, options)                                                                                                                                         
  File "*/lib/python3.7/site-packages/pip/_internal/commands/search.py", line 82, in search                                                 
    hits = pypi.search({'name': query, 'summary': query}, 'or')                                                                                                                     
  File "/usr/lib/python3.7/xmlrpc/client.py", line 1112, in __call__                                                                                                                
    return self.__send(self.__name, args)                                                                                                                                           
  File "/usr/lib/python3.7/xmlrpc/client.py", line 1452, in __request                                                                                                               
    verbose=self.__verbose                                                                                                                                                          
  File "*/lib/python3.7/site-packages/pip/_internal/network/xmlrpc.py", line 46, in request                                                 
    return self.parse_response(response.raw)                                                                                                                                        
  File "/usr/lib/python3.7/xmlrpc/client.py", line 1342, in parse_response                                                                                                          
    return u.close()                                                                                                                                                                
  File "/usr/lib/python3.7/xmlrpc/client.py", line …