How to make a userinfo/whois command in discord bot (discord.py)

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[codewithquill]

discord.py went through some major update, due to that some part of code may face issues and show errors, nothing to worry about, feel free to join my discord server and proceed with queries.

[AAAaAAae]

after async def whois(ctx, user: disnake.Member = None):, add this:
if user == None:
user = ctx.author
this way, even if a user doesnt ping anyone, itll display their info

[juegosretro]

in the case of not having a role, it does not show the user's information
how would this be done?