Changing color of a discord role

Everything is set up right, the bot is in the discord, connected, etc. This code:

import discord
import random

client = discord.Client()

@client.event
async def on_ready():
    print('We have logged in as {0.user}'.format(client))
    color2 = "%06x" % random.randint(0, 0xFFFFFF)
    print(color2)

@client.event
async def on_message(message):
    if message.author == client.user:
        return

    if message.content.startswith('!randomcolor'):
        server = client.get_guild('')
        role = "Rainbow tester"
        color = "%06x" % random.randint(0, 0xFFFFFF)
        await role.edit(server=server, role=role, colour=color)
        await message.channel.send('Trying that...')

client.run('TOKEN')

Gives this error:

Ignoring exception in on_message
Traceback (most recent call last):
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "main.py", line 22, in on_message
    await role.edit(server=server, role=role, colour=color)
AttributeError: 'str' object has no attribute 'edit'

If anyone can find where I went wrong or any errors I’ve made, please help!

Answer

I would use the discord.Color.random() function for that as it looks like the problem occurs in your color-line.

Re-write your code to the following:

from discord.utils import get

    if message.content.startswith('!randomcolor'):
        guild = client.get_guild(GuildID)
        role = get(guild.roles, name="Rainbow tester") # Get the role
        color = discord.Color.random() # Choose a random color
        await role.edit(server=guild, role=role, colour=color)
        await message.channel.send('Trying that...')

What did we do?

• Imported from discord.utils import get
• Changed the way we get the role: (get(guild.roles, name="Rainbow tester") or role = discord.utils.get(message.guild.roles, name='Rainbow tester')
• Used the discord.Color.random() function to choose a random color