human
Solve the following python programming problem given the following code:
def __call__(self, environ, start_response) : 
    def keep_status_start_response(status, headers, exc_info = None) : 
        for (header, value) in headers : 
            if (header.lower () == 'set-cookie') : 
                self.headers.append ((header, value)) 
else : 
                replace_header (self.headers, header, value) 
return start_response (self.status, self.headers, exc_info) 
parts = self.url.split ('?') 
    environ ['PATH_INFO'] = start_response [0] 
    if (len (parts) > 1) : 
        environ ['QUERY_STRING'] = parts [1] 
else : 
        environ ['QUERY_STRING'] = '' 
try : 
        return self.app (environ, keep_status_start_response) 
except RecursionLoop as e : 
        line = ('Recursion error getting error page: %s
' % e) 
        if six.PY3 : 
            line = line.encode ('utf8') 
environ ['wsgi.errors'].write (line) 
        keep_status_start_response ('500 Server Error', [('Content-type', 'text/plain')], sys.exc_info ()) 
        body = ('Error: %s.  (Error page could not be fetched)' % self.status) 
        if six.PY3 : 
            body = body.encode ('utf8') 
return [body] 

    
    

    Fix the buggy line: environ ['PATH_INFO'] = start_response [0]
assistant
#Here is Python code to fix the buggy line: environ ['PATH_INFO'] = start_response [0]
.

environ ['PATH_INFO'] = parts [0]