diff --git a/youtube_dl/extractor/animeondemand.py b/youtube_dl/extractor/animeondemand.py
index e4fa72f466..1fe5d5e56e 100644
--- a/youtube_dl/extractor/animeondemand.py
+++ b/youtube_dl/extractor/animeondemand.py
@@ -52,7 +52,7 @@ class AnimeOnDemandIE(InfoExtractor):
     }]
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/atresplayer.py b/youtube_dl/extractor/atresplayer.py
index 1a31ebe082..ae1c094277 100644
--- a/youtube_dl/extractor/atresplayer.py
+++ b/youtube_dl/extractor/atresplayer.py
@@ -74,7 +74,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/bambuser.py b/youtube_dl/extractor/bambuser.py
index 633c57553d..34f1b3d836 100644
--- a/youtube_dl/extractor/bambuser.py
+++ b/youtube_dl/extractor/bambuser.py
@@ -44,7 +44,7 @@ class BambuserIE(InfoExtractor):
     }
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/crunchyroll.py b/youtube_dl/extractor/crunchyroll.py
index 3efdc8c21d..311da515df 100644
--- a/youtube_dl/extractor/crunchyroll.py
+++ b/youtube_dl/extractor/crunchyroll.py
@@ -49,7 +49,7 @@ def _call_rpc_api(self, method, video_id, note=None, data=None):
             })
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/curiositystream.py b/youtube_dl/extractor/curiositystream.py
index 8e45923e3d..35b1e7a34e 100644
--- a/youtube_dl/extractor/curiositystream.py
+++ b/youtube_dl/extractor/curiositystream.py
@@ -35,7 +35,7 @@ def _call_api(self, path, video_id):
         return result['data']
 
     def _real_initialize(self):
-        (email, password) = self._get_login_info()
+        email, password = self._get_login_info()
         if email is None:
             return
         result = self._download_json(
diff --git a/youtube_dl/extractor/dramafever.py b/youtube_dl/extractor/dramafever.py
index ffbd2623d1..ab32ba4ff3 100644
--- a/youtube_dl/extractor/dramafever.py
+++ b/youtube_dl/extractor/dramafever.py
@@ -42,7 +42,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/facebook.py b/youtube_dl/extractor/facebook.py
index 220ada3a6d..0971ce3564 100644
--- a/youtube_dl/extractor/facebook.py
+++ b/youtube_dl/extractor/facebook.py
@@ -226,7 +226,7 @@ def _extract_urls(webpage):
         return urls
 
     def _login(self):
-        (useremail, password) = self._get_login_info()
+        useremail, password = self._get_login_info()
         if useremail is None:
             return
 
diff --git a/youtube_dl/extractor/fc2.py b/youtube_dl/extractor/fc2.py
index 448647d727..435561147f 100644
--- a/youtube_dl/extractor/fc2.py
+++ b/youtube_dl/extractor/fc2.py
@@ -46,7 +46,7 @@ class FC2IE(InfoExtractor):
     }]
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None or password is None:
             return False
 
diff --git a/youtube_dl/extractor/funimation.py b/youtube_dl/extractor/funimation.py
index 107f658baf..07d01caecf 100644
--- a/youtube_dl/extractor/funimation.py
+++ b/youtube_dl/extractor/funimation.py
@@ -51,7 +51,7 @@ class FunimationIE(InfoExtractor):
     }]
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
         try:
diff --git a/youtube_dl/extractor/gdcvault.py b/youtube_dl/extractor/gdcvault.py
index f71d9092e5..8806dc48a9 100644
--- a/youtube_dl/extractor/gdcvault.py
+++ b/youtube_dl/extractor/gdcvault.py
@@ -91,7 +91,7 @@ class GDCVaultIE(InfoExtractor):
     ]
 
     def _login(self, webpage_url, display_id):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None or password is None:
             self.report_warning('It looks like ' + webpage_url + ' requires a login. Try specifying a username and password and try again.')
             return None
diff --git a/youtube_dl/extractor/globo.py b/youtube_dl/extractor/globo.py
index 81d6d36d32..c2140c3627 100644
--- a/youtube_dl/extractor/globo.py
+++ b/youtube_dl/extractor/globo.py
@@ -23,7 +23,6 @@
 
 class GloboIE(InfoExtractor):
     _VALID_URL = r'(?:globo:|https?://.+?\.globo\.com/(?:[^/]+/)*(?:v/(?:[^/]+/)?|videos/))(?P<id>\d{7,})'
-    _LOGGED_IN = False
     _NETRC_MACHINE = 'globo'
     _TESTS = [{
         'url': 'http://g1.globo.com/carros/autoesporte/videos/t/exclusivos-do-g1/v/mercedes-benz-gla-passa-por-teste-de-colisao-na-europa/3607726/',
@@ -68,9 +67,6 @@ class GloboIE(InfoExtractor):
     }]
 
     def _real_initialize(self):
-        if self._LOGGED_IN:
-            return
-
         email, password = self._get_login_info()
         if email is None:
             return
@@ -91,7 +87,6 @@ def _real_initialize(self):
                 resp = self._parse_json(e.cause.read(), None)
                 raise ExtractorError(resp.get('userMessage') or resp['id'], expected=True)
             raise
-        self._LOGGED_IN = True
 
     def _real_extract(self, url):
         video_id = self._match_id(url)
diff --git a/youtube_dl/extractor/hidive.py b/youtube_dl/extractor/hidive.py
index d8f2e682fb..39fabe8a55 100644
--- a/youtube_dl/extractor/hidive.py
+++ b/youtube_dl/extractor/hidive.py
@@ -18,7 +18,6 @@ class HiDiveIE(InfoExtractor):
     # so disabling geo bypass completely
     _GEO_BYPASS = False
     _NETRC_MACHINE = 'hidive'
-    _LOGGED_IN = False
     _LOGIN_URL = 'https://www.hidive.com/account/login'
 
     _TESTS = [{
@@ -38,10 +37,7 @@ class HiDiveIE(InfoExtractor):
     }]
 
     def _real_initialize(self):
-        if self._LOGGED_IN:
-            return
-
-        (email, password) = self._get_login_info()
+        email, password = self._get_login_info()
         if email is None:
             return
 
@@ -56,7 +52,6 @@ def _real_initialize(self):
         })
         self._download_webpage(
             self._LOGIN_URL, None, 'Logging in', data=urlencode_postdata(data))
-        self._LOGGED_IN = True
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
diff --git a/youtube_dl/extractor/hrti.py b/youtube_dl/extractor/hrti.py
index 6424d34ac4..9ba1aa7032 100644
--- a/youtube_dl/extractor/hrti.py
+++ b/youtube_dl/extractor/hrti.py
@@ -66,7 +66,7 @@ def _initialize_api(self):
         self._logout_url = modules['user']['resources']['logout']['uri']
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         # TODO: figure out authentication with cookies
         if username is None or password is None:
             self.raise_login_required()
diff --git a/youtube_dl/extractor/iqiyi.py b/youtube_dl/extractor/iqiyi.py
index fdfa7de9ef..4b081bd469 100644
--- a/youtube_dl/extractor/iqiyi.py
+++ b/youtube_dl/extractor/iqiyi.py
@@ -239,7 +239,7 @@ def _rsa_fun(data):
         return ohdave_rsa_encrypt(data, e, N)
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
 
         # No authentication to be performed
         if not username:
diff --git a/youtube_dl/extractor/niconico.py b/youtube_dl/extractor/niconico.py
index df7f528be2..dbe871f165 100644
--- a/youtube_dl/extractor/niconico.py
+++ b/youtube_dl/extractor/niconico.py
@@ -163,7 +163,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         # No authentication to be performed
         if not username:
             return True
diff --git a/youtube_dl/extractor/noco.py b/youtube_dl/extractor/noco.py
index a9f9b10c47..58b371ed74 100644
--- a/youtube_dl/extractor/noco.py
+++ b/youtube_dl/extractor/noco.py
@@ -65,7 +65,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/packtpub.py b/youtube_dl/extractor/packtpub.py
index 8ed3c6347c..56a2a1083a 100644
--- a/youtube_dl/extractor/packtpub.py
+++ b/youtube_dl/extractor/packtpub.py
@@ -42,7 +42,7 @@ class PacktPubIE(PacktPubBaseIE):
     _TOKEN = None
 
     def _real_initialize(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
         try:
diff --git a/youtube_dl/extractor/patreon.py b/youtube_dl/extractor/patreon.py
index d4b1d34ca8..9eb0276795 100644
--- a/youtube_dl/extractor/patreon.py
+++ b/youtube_dl/extractor/patreon.py
@@ -53,7 +53,7 @@ class PatreonIE(InfoExtractor):
     # needed. Keeping this commented for when this inevitably changes.
     '''
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/pluralsight.py b/youtube_dl/extractor/pluralsight.py
index 3c508c9ca0..a207ca9cb9 100644
--- a/youtube_dl/extractor/pluralsight.py
+++ b/youtube_dl/extractor/pluralsight.py
@@ -94,7 +94,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/roosterteeth.py b/youtube_dl/extractor/roosterteeth.py
index 8b703800ec..857434540d 100644
--- a/youtube_dl/extractor/roosterteeth.py
+++ b/youtube_dl/extractor/roosterteeth.py
@@ -50,7 +50,7 @@ class RoosterTeethIE(InfoExtractor):
     }]
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/safari.py b/youtube_dl/extractor/safari.py
index cc6698f882..8a5d48fc2c 100644
--- a/youtube_dl/extractor/safari.py
+++ b/youtube_dl/extractor/safari.py
@@ -27,7 +27,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/sina.py b/youtube_dl/extractor/sina.py
index 8fc66732af..07b766b4a7 100644
--- a/youtube_dl/extractor/sina.py
+++ b/youtube_dl/extractor/sina.py
@@ -64,7 +64,7 @@ def _real_extract(self, url):
                 # The video id is in the redirected url
                 self.to_screen('Getting video id')
                 request = HEADRequest(url)
-                (_, urlh) = self._download_webpage_handle(request, 'NA', False)
+                _, urlh = self._download_webpage_handle(request, 'NA', False)
                 return self._real_extract(urlh.geturl())
             else:
                 pseudo_id = mobj.group('pseudo_id')
diff --git a/youtube_dl/extractor/tennistv.py b/youtube_dl/extractor/tennistv.py
index 0c6f70784c..a586f30ad5 100644
--- a/youtube_dl/extractor/tennistv.py
+++ b/youtube_dl/extractor/tennistv.py
@@ -32,7 +32,7 @@ class TennisTVIE(InfoExtractor):
     _NETRC_MACHINE = 'tennistv'
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if not username or not password:
             raise ExtractorError('No login info available, needed for using %s.' % self.IE_NAME, expected=True)
 
diff --git a/youtube_dl/extractor/tubitv.py b/youtube_dl/extractor/tubitv.py
index 36f6c16732..a51fa6515e 100644
--- a/youtube_dl/extractor/tubitv.py
+++ b/youtube_dl/extractor/tubitv.py
@@ -36,7 +36,7 @@ class TubiTvIE(InfoExtractor):
     }]
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
         self.report_login()
diff --git a/youtube_dl/extractor/tumblr.py b/youtube_dl/extractor/tumblr.py
index 89e6eb5abb..edbb0aa694 100644
--- a/youtube_dl/extractor/tumblr.py
+++ b/youtube_dl/extractor/tumblr.py
@@ -108,7 +108,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/twitch.py b/youtube_dl/extractor/twitch.py
index 3ee2af52e8..e01f113310 100644
--- a/youtube_dl/extractor/twitch.py
+++ b/youtube_dl/extractor/twitch.py
@@ -61,7 +61,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/udemy.py b/youtube_dl/extractor/udemy.py
index 0a74a97689..a7196997ec 100644
--- a/youtube_dl/extractor/udemy.py
+++ b/youtube_dl/extractor/udemy.py
@@ -151,7 +151,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/vessel.py b/youtube_dl/extractor/vessel.py
index 80a643dfe6..31eee0ba72 100644
--- a/youtube_dl/extractor/vessel.py
+++ b/youtube_dl/extractor/vessel.py
@@ -75,7 +75,7 @@ def _check_access_rights(self, data):
                     'Access to this content is restricted. (%s said: %s)' % (self.IE_NAME, err_code), expected=True)
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
         self.report_login()
diff --git a/youtube_dl/extractor/viki.py b/youtube_dl/extractor/viki.py
index ad2a2a4b70..546de95d85 100644
--- a/youtube_dl/extractor/viki.py
+++ b/youtube_dl/extractor/viki.py
@@ -88,7 +88,7 @@ def _real_initialize(self):
         self._login()
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/vimeo.py b/youtube_dl/extractor/vimeo.py
index 8dfd8891ce..3baa2d0755 100644
--- a/youtube_dl/extractor/vimeo.py
+++ b/youtube_dl/extractor/vimeo.py
@@ -37,7 +37,7 @@ class VimeoBaseInfoExtractor(InfoExtractor):
     _LOGIN_URL = 'https://vimeo.com/log_in'
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             if self._LOGIN_REQUIRED:
                 raise ExtractorError('No login info available, needed for using %s.' % self.IE_NAME, expected=True)
diff --git a/youtube_dl/extractor/vk.py b/youtube_dl/extractor/vk.py
index b50d4f1703..29002b35fc 100644
--- a/youtube_dl/extractor/vk.py
+++ b/youtube_dl/extractor/vk.py
@@ -32,7 +32,7 @@ class VKBaseIE(InfoExtractor):
     _NETRC_MACHINE = 'vk'
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if username is None:
             return
 
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index e4eec7c308..379559825b 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -85,7 +85,7 @@ def _login(self):
 
         If _LOGIN_REQUIRED is set and no authentication was provided, an error is raised.
         """
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         # No authentication to be performed
         if username is None:
             if self._LOGIN_REQUIRED and self._downloader.params.get('cookiefile') is None:
diff --git a/youtube_dl/extractor/zattoo.py b/youtube_dl/extractor/zattoo.py
index 773073d85b..b5a3a07168 100644
--- a/youtube_dl/extractor/zattoo.py
+++ b/youtube_dl/extractor/zattoo.py
@@ -24,7 +24,7 @@ class ZattooBaseIE(InfoExtractor):
     _power_guide_hash = None
 
     def _login(self):
-        (username, password) = self._get_login_info()
+        username, password = self._get_login_info()
         if not username or not password:
             self.raise_login_required(
                 'A valid %s account is needed to access this media.'