diff -purN requests-ftp-0.3.1.orig/requests_ftp/ftp.py requests-ftp-0.3.1/requests_ftp/ftp.py
--- requests-ftp-0.3.1.orig/requests_ftp/ftp.py	2018-08-02 10:15:20.491042199 -0400
+++ requests-ftp-0.3.1/requests_ftp/ftp.py	2018-08-02 10:16:16.588081626 -0400
@@ -44,6 +44,7 @@ class FTPSession(requests.Session):
         '''Sends an FTP SIZE. Returns a decimal number.'''
         return self.request('SIZE', url, **kwargs)
 
+log = logging.getLogger(__name__)
 
 def monkeypatch_session():
     '''Monkeypatch Requests Sessions to provide all the helper
@@ -135,10 +136,13 @@ def get_status_code_from_code_response(c
     status_code_from_last_line = int(last_valid_line_from_code.split()[0])
     status_code_from_first_digits = int(code[:3])
     if status_code_from_last_line != status_code_from_first_digits:
-        logging.warning(
+        log.warning(
             'FTP response status code seems to be inconsistent.\n'
-            'Code received: {0}, extracted: {1} and {2}'.format(
-                code, status_code_from_last_line, status_code_from_first_digits))
+            'Code received: %s, extracted: %s and %s',
+            code,
+            status_code_from_last_line,
+            status_code_from_first_digits
+        )
     return status_code_from_last_line