Removed the local version of the file and added some comments

src/__main__.py

@@ -1,3 +1,5 @@
+import os
+
 from tqdm import tqdm
 
 from src import *
@@ -6,23 +8,29 @@
 
 def scrape():
     for artist_letter in tqdm(AZ_LYRICS_ARTIST_LETTER_LIST, total=len(AZ_LYRICS_ARTIST_LETTER_LIST)):
+        # Downloads file if it is available on Box folder.
         csv_file_name = f'{CSV_FILE}_{artist_letter}.csv'
         file_id = box_sdk.search_file(BOX_FOLDER_APP_ID, csv_file_name.split('/')[-1])
         if file_id:
             box_sdk.download_file(file_id, csv_file_name)
 
+        # Iterates over all artists with the given letter.
         artist_url_list = azlyrics.get_artist_url_list(artist_letter)
         for artist_name, artist_url in tqdm(artist_url_list, total=len(artist_url_list)):
             song_url_list = azlyrics.get_song_url_list(artist_url)
             for song_name, song_url in tqdm(song_url_list, total=len(song_url_list)):
                 if not csv_parser.exists_song(artist_letter, artist_url, song_url):
                     song_lyrics = azlyrics.get_song_lyrics(song_url)
                     csv_parser.append_to_csv(artist_name, artist_url, song_name, song_url, song_lyrics, artist_letter)
+            # Uploads or updates the CSV on Box per every artist.
             if file_id:
                 file_id = box_sdk.update_file(file_id, csv_file_name)
             else:
                 file_id = box_sdk.upload_file(BOX_FOLDER_APP_ID, csv_file_name)
 
+        # Removes the local version of the CSV for saving storage.
+        os.remove(csv_file_name)
+
 
 if __name__ == '__main__':
     scrape()