simplify extractor constants

- single strings for URL patterns
- tuples instead of lists for 'directory_fmt' and 'test'
- single-tuple tests where applicable

gallery_dl/extractor/slideshare.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2016-2018 Mike Fährmann, Leonardo Taccari
+# Copyright 2016-2019 Mike Fährmann, Leonardo Taccari
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -16,30 +16,28 @@ class SlidesharePresentationExtractor(Extractor):
     """Extractor for images from a presentation on slideshare.net"""
     category = "slideshare"
     subcategory = "presentation"
-    directory_fmt = ["{category}", "{user}"]
+    directory_fmt = ("{category}", "{user}")
     filename_fmt = "{presentation}-{num:>02}.{extension}"
     archive_fmt = "{presentation}_{num}"
-    pattern = [r"(?:https?://)?(?:www\.)?slideshare\.net"
-               r"/(?:mobile/)?([^/?&#]+)/([^/?&#]+)"]
-    test = [
+    pattern = (r"(?:https?://)?(?:www\.)?slideshare\.net"
+               r"/(?:mobile/)?([^/?&#]+)/([^/?&#]+)")
+    test = (
         (("https://www.slideshare.net"
           "/Slideshare/get-started-with-slide-share"), {
             "url": "23685fb9b94b32c77a547d45dc3a82fe7579ea18",
             "content": "ee54e54898778e92696a7afec3ffabdbd98eb0cc",
         }),
-
         # long title
         (("https://www.slideshare.net/pragmaticsolutions/warum-sie-nicht-ihren"
           "-mitarbeitenden-ndern-sollten-sondern-ihr-managementsystem"), {
             "url": "cf70ca99f57f61affab47ebf8583eb564b21e3a7",
         }),
-
         # mobile URL
         (("https://www.slideshare.net"
           "/mobile/uqudent/introduction-to-fixed-prosthodontics"), {
             "url": "59993ad7b0cb93c73011547eedcd02c622649e9d",
         }),
-    ]
+    )
 
     def __init__(self, match):
         Extractor.__init__(self)