Decouple fetching metadata

spotdl/lyrics/providers/genius.py

@@ -14,6 +14,11 @@ class Genius(LyricBase):
         self.base_url = BASE_URL
 
     def _guess_lyric_url(self):
+        """
+        Returns the possible lyric URL for the track available
+        on Genius. This may not always be a valid URL, but this
+        is apparently the best we can do at the moment?
+        """
         query = "/{} {} lyrics".format(self.artist, self.track)
         query = query.replace(" ", "-")
         encoded_query = urllib.request.quote(query)
@@ -21,6 +26,10 @@ class Genius(LyricBase):
         return lyric_url
 
     def _fetch_page(self, url, timeout=None):
+        """
+        Makes a GET request to the given URL and returns the
+        HTML content in the case of a valid response.
+        """
         request = urllib.request.Request(url)
         request.add_header("User-Agent", "urllib")
         try:
@@ -35,14 +44,23 @@ class Genius(LyricBase):
             return response.read()
 
     def _get_lyrics_text(self, html):
+        """
+        Extracts and returns the lyric content from the
+        provided HTML.
+        """
         soup = BeautifulSoup(html, "html.parser")
         lyrics_paragraph = soup.find("p")
         if lyrics_paragraph:
             return lyrics_paragraph.get_text()
         else:
-            raise LyricsNotFoundError("The lyrics for this track are yet to be released.")
+            raise LyricsNotFoundError(
+                "The lyrics for this track are yet to be released."
+            )
 
     def get_lyrics(self, linesep="\n", timeout=None):
+        """
+        Returns the lyric string for the given artist and track.
+        """
         url = self._guess_lyric_url()
         html_page = self._fetch_page(url, timeout=timeout)
         lyrics = self._get_lyrics_text(html_page)