Implement PR feedback and cull trailing whitespace

Default post privacy to match account privacy setting. Remove sensitive/visibility parameters from simple toot() function.

mastodon/Mastodon.py

@@ -318,17 +318,35 @@ class Mastodon:
     ###
     # Writing data: Statuses
     ###
-    def status_post(self, status, in_reply_to_id = None, media_ids = None, sensitive = False, visibility = "public"):
+    def status_post(self, status, in_reply_to_id = None, media_ids = None, sensitive = False, visibility = ''):
         """
         Post a status. Can optionally be in reply to another status and contain
         up to four pieces of media (Uploaded via media_post()). media_ids can
         also be the media dicts returned by media_post - they are unpacked
         automatically.
 
+        The 'sensitive' boolean decides whether or not media attached to the post
+        should be marked as sensitive, which hides it by default on the Mastodon
+        web front-end.
+
+        The visibility parameter is a string value and matches the visibility
+        option on the /api/v1/status POST API endpoint. It accepts any of:
+        'private' - post will be visible only to followers
+        'unlisted' - post will be public but not appear on the public timeline
+        'public' - post will be public
+
+        If not passed in, visibility defaults to match the current account's
+        privacy setting (private if the account is locked, public otherwise).
+
         Returns a toot dict with the new status.
         """
         params_initial = locals()
 
+        # Validate visibility parameter
+        valid_visibilities = ['private', 'public', 'unlisted', '']
+        if params_initial['visibility'].lower() not in valid_visibilities:
+            raise ValueError('Invalid visibility value! Acceptable values are %s' % valid_visibilities)
+
         if media_ids != None:
             try:
                 media_ids_proper = []
@@ -345,13 +363,13 @@ class Mastodon:
         params = self.__generate_params(params_initial)
         return self.__api_request('POST', '/api/v1/statuses', params)
 
-    def toot(self, status, sensitive=False, visibility="public"):
+    def toot(self, status):
         """
         Synonym for status_post that only takes the status text as input.
 
         Returns a toot dict with the new status.
         """
-        return self.status_post(status, sensitive=sensitive, visibility=visibility)
+        return self.status_post(status)
 
     def status_delete(self, id):
         """