Added a Command Error Handler to filter errors and easily manage

tracebacks

commandErrorHandlerFile.py

@@ -0,0 +1,48 @@
+import traceback
+import sys
+from discord.ext import commands
+
+""" http://discordpy.readthedocs.io/en/rewrite/ext/commands/api.html#errors for a list of exceptions"""
+
+
+class CommandErrorHandler:
+    def __init__(self, client):
+        self.client = client
+
+    async def on_command_error(self, ctx, error):
+        """Triggers when an error is raised while calling/invoking any command."""
+
+        # Tuple of ignored errors
+        ignored = (commands.CommandNotFound, commands.CommandOnCooldown, commands.UserInputError)
+
+        # Check for original exceptions raised and sent to CommandInvokeError.
+        # Otherwise, keep the exception passed to on_command_error.
+        error = getattr(error, 'original', error)
+
+        # If the error is ignored, return and nothing happens.
+        if isinstance(error, ignored):
+            return
+
+        # If a disabled command has been called by a user.
+        elif isinstance(error, commands.DisabledCommand):
+            return await ctx.send(f'{ctx.command} has been disabled.')
+
+        # If the command can only be used in server channels (and not Direct Messages)
+        elif isinstance(error, commands.NoPrivateMessage):
+            try:
+                return await ctx.author.send(f'{ctx.command} can not be used in Private Messages.')
+            except:
+                pass
+
+        # If user mentioned does not exist (for the >user command)
+        elif isinstance(error, commands.BadArgument):
+            if ctx.command.qualified_name == 'user':
+                return await ctx.send('I could not find that member. Please try again.')
+
+        # If the error hasn't been returned yet, print the traceback
+        print('Ignoring exception in command {}:'.format(ctx.command), file=sys.stderr)
+        traceback.print_exception(type(error), error, error.__traceback__, file=sys.stderr)
+
+
+def setup(client):
+    client.add_cog(CommandErrorHandler(client))