Get all text channels and change permissions in Discord.py

Question

I would like to be able to change the send_messages permission to off to be able to lock all channels, like "lockdown" command.

The command : await ctx.channel.set_permissions(ctx.guild.default_role,send_messages=False)

Answer 1

for channel in guild.channels:
       if isinstance(channel, discord.TextChannel):
           await channel.set_permissions(guild.default_role, send_messages=False)

Try this out :D