Fix pylint issues

.pylintrc

@@ -0,0 +1,22 @@
+[MASTER]
+init-hook="from pylint.config import find_pylintrc; import os, sys; sys.path.append(os.path.dirname(find_pylintrc()) + '/src'); sys.path.append(os.path.dirname(find_pylintrc()) + '/test')"
+
+[MESSAGES CONTROL]
+disable=
+  missing-module-docstring,
+  missing-class-docstring,
+  missing-function-docstring,
+  global-statement,
+  too-many-arguments,
+  too-few-public-methods,
+  wrong-import-position,
+  redefined-outer-name,
+  invalid-name,
+  no-self-use
+
+[FORMAT]
+indent-string='  '
+max-line-length=160
+
+[SIMILARITIES]
+ignore-comments = no

src/bot.py

@@ -1,5 +1,5 @@
-import asyncio
 import os
+import sys
 
 import discord
 from discord.ext import commands
@@ -28,9 +28,9 @@ class Music(commands.Cog):
     """Plays a file from the local filesystem"""
 
     source = discord.PCMVolumeTransformer(discord.FFmpegPCMAudio(query))
-    ctx.voice_client.play(source, after=lambda e: print('Player error: %s' % e) if e else None)
+    ctx.voice_client.play(source, after=lambda e: print(f"Player error: {e}") if e else None)
 
-    await ctx.send('Now playing: {}'.format(query))
+    await ctx.send(f"Now playing: {query}")
 
   @commands.command()
   async def yt(self, ctx, *, url):
@@ -38,9 +38,9 @@ class Music(commands.Cog):
 
     async with ctx.typing():
       player = await YTDLSource.from_url(url, loop=self.bot.loop)
-      ctx.voice_client.play(player, after=lambda e: print('Player error: %s' % e) if e else None)
+      ctx.voice_client.play(player, after=lambda e: print(f"Player error: {e}") if e else None)
 
-    await ctx.send('Now playing: {}'.format(player.title))
+    await ctx.send(f"Now playing: {player.title}")
 
   @commands.command()
   async def stream(self, ctx, *, url):
@@ -48,9 +48,9 @@ class Music(commands.Cog):
 
     async with ctx.typing():
       player = await YTDLSource.from_url(url, loop=self.bot.loop, stream=True)
-      ctx.voice_client.play(player, after=lambda e: print('Player error: %s' % e) if e else None)
+      ctx.voice_client.play(player, after=lambda e: print(f"Player error: {e}") if e else None)
 
-    await ctx.send('Now playing: {}'.format(player.title))
+    await ctx.send(f"Now playing: {player.title}")
 
   @commands.command()
   async def volume(self, ctx, volume: int):
@@ -60,7 +60,7 @@ class Music(commands.Cog):
       return await ctx.send("Not connected to a voice channel.")
 
     ctx.voice_client.source.volume = volume / 100
-    await ctx.send("Changed volume to {}%".format(volume))
+    await ctx.send(f"Changed volume to {volume}%")
 
   @commands.command()
   async def stop(self, ctx):
@@ -82,13 +82,12 @@ class Music(commands.Cog):
       ctx.voice_client.stop()
 
 
-bot = commands.Bot(command_prefix=commands.when_mentioned_or("!"),
-                   description='Relatively simple music bot example')
+bot = commands.Bot(command_prefix=commands.when_mentioned_or("!"), description='Relatively simple music bot example')
 
 
 @bot.event
 async def on_ready():
-  print('Logged in as {0} ({0.id})'.format(bot.user))
+  print(f"Logged in as {bot.user} ({bot.user.id})")
   print('------')
 
 bot.add_cog(Music(bot))
@@ -96,6 +95,6 @@ bot.add_cog(Music(bot))
 token = os.environ.get("BOT_TOKEN", None)
 if not token:
   print("No token fouund in BOT_TOKEN")
-  exit(1)
+  sys.exit(1)
 
 bot.run(token)