pylint errors

Author: martymcguire

adafruit_pyportal.py

@@ -589,12 +589,12 @@ def image_converter_url(self, image_url, width, height, color_depth=16):
            with the given width and height. aio_username and aio_key must be
            set in secrets."""
         try:
-            aio_username = secrets['aio_username']
-            aio_key = secrets['aio_key']
+            self._aio_username = secrets['aio_username']
+            self._aio_key = secrets['aio_key']
         except KeyError:
             raise KeyError("\n\nOur image converter service require a login/password to rate-limit. Please register for a freeadafruit.io account and place the user/key in your secrets file under 'aio_username' and 'aio_key'")# pylint: disable=line-too-long
 
-        return IMAGE_CONVERTER_SERVICE % (aio_username, aio_key,
+        return IMAGE_CONVERTER_SERVICE % (self._aio_username, self._aio_key,
                                           width, height,
                                           color_depth, image_url)
 
@@ -817,4 +817,4 @@ def wrap_nicely(string, max_chars):
                 the_line = ''+w
         if the_line:      # last line remaining
             the_lines.append(the_line)
-        return the_lines
+        return the_lines