Change VideoInfo functions to accessor style

pytchat/tool/videoinfo.py

@@ -4,8 +4,10 @@ import requests
 from .. import config
 from .. import util
 from ..exceptions import InvalidVideoIdException 
+
 headers = config.headers
-pattern=re.compile(r"yt\.setConfig\({'PLAYER_CONFIG': ({.*})}\);")
+
+pattern = re.compile(r"yt\.setConfig\({'PLAYER_CONFIG': ({.*})}\);")
 
 item_channel_id =[
     "videoDetails",
@@ -36,7 +38,6 @@ item_author_image =[
     "url"
 ]
 
-
 item_thumbnail = [
     "defaultThumbnail",
     "thumbnails",
@@ -63,24 +64,27 @@ item_moving_thumbnail = [
 ]
 
 class VideoInfo:
-    def __init__(self,video_id):
+    '''
+    VideoInfo object retrieves YouTube video informations
+    from the video page.
+
+    Parameter
+    ---------
+    video_id : str
+
+    Exception
+    ---------
+    InvalidVideoIdException :
+        Occurs when video_id does not exist on YouTube.
+    '''
+    def __init__(self, video_id):
         self.video_id = video_id
         text = self._get_page_text(video_id)
         self._parse(text)
-        self._get_attributes()
 
-    def _get_attributes(self):
-        self.duration = self._duration()
-        self.channel_id = self._channel_id()
-        self.channel_name = self._channel_name()
-        self.thumbnail = self._thumbnail()
-        self.author_image = self._author_image()
-        self.title = self._title()
-        self.moving_thumbnail = self._moving_thumbnail()
-
-    def _get_page_text(self,video_id):
+    def _get_page_text(self, video_id):
         url = f"https://www.youtube.com/embed/{video_id}"
-        resp= requests.get(url, headers = headers)
+        resp = requests.get(url, headers = headers)
         resp.raise_for_status()
         return resp.text
 
@@ -91,8 +95,8 @@ class VideoInfo:
         if response is None:
             raise InvalidVideoIdException(
                 f"Specified video_id [{self.video_id}] is invalid.")
-        self.renderer = self._get_item(json.loads(response), item_renderer)
-        if self.renderer is None:
+        self._renderer = self._get_item(json.loads(response), item_renderer)
+        if self._renderer is None:
             raise InvalidVideoIdException(
                 f"No renderer found in video_id: [{self.video_id}].")
 
@@ -111,29 +115,35 @@ class VideoInfo:
             return None
         return dict_body
 
-    def _duration(self):
-        return int(self.renderer.get("videoDurationSeconds") or 0)
-
-    def _title(self):
-        if self.renderer.get("title"):
-            return [''.join(run["text"]) 
-                for run in self.renderer["title"]["runs"]][0]
+    def get_duration(self):
+        duration_seconds = self._renderer.get("videoDurationSeconds")
+        if duration_seconds:
+            '''Fetched value is string, so cast to integer.'''
+            return int(duration_seconds)
+        '''When key is not found, explicitly returns None.'''
         return None
 
-    def _channel_id(self):
-        channel_url = self._get_item(self.renderer, item_channel_id)
+    def get_title(self):
+        print(self._renderer)
+        if self._renderer.get("title"):
+            return [''.join(run["text"]) 
+                for run in self._renderer["title"]["runs"]][0]
+        return None
+
+    def get_channel_id(self):
+        channel_url = self._get_item(self._renderer, item_channel_id)
         if channel_url:
             return channel_url[9:]
         return None
 
-    def _author_image(self):
-        return self._get_item(self.renderer, item_author_image) 
+    def get_author_image(self):
+        return self._get_item(self._renderer, item_author_image) 
 
-    def _thumbnail(self):
-        return self._get_item(self.renderer, item_thumbnail)
+    def get_thumbnail(self):
+        return self._get_item(self._renderer, item_thumbnail)
 
-    def _channel_name(self):
-        return self._get_item(self.renderer, item_channel_name)
+    def get_channel_name(self):
+        return self._get_item(self._renderer, item_channel_name)
     
-    def _moving_thumbnail(self):
-        return self._get_item(self.renderer, item_moving_thumbnail)
+    def get_moving_thumbnail(self):
+        return self._get_item(self._renderer, item_moving_thumbnail)