How can I import a cog into my main.py file?

My cog file isn't sending any errors but does not work. A friend of mine suggested importing the cog to my main file. I previously checked on Stackoverflow on how to import it but the method along the line of import (file name here, without extension) doesn't exactly work. I am using the Pycord library by the way.

import discord
from discord.ext import commands
import os

client = commands.Bot(command_prefix = "!")
client.remove_command('help')

@client.event
async def on_ready():
  await client.change_presence(status = discord.Status.do_not_disturb, activity = discord.Game("Being Handy."))
  print("Bot is ready!")

## - Cog Loader --------------------------------------------------

cogs = ["cogs.Secondary"]

Start_Decor="----- Connecting Cogs -----\n---------------------------"
End_Decor = "\n---------------------------\n----- Cogs  Connected -----"
Fail = "N/A"
Success = False

for cog in cogs:
  try:
    client.load_extension(cog)
    Success = True
  except Exception as e:
    if Fail == "N/A":
      Fail = f'🚫 Failed to connect the following:\n\n{cog}: {str(e)}'
    else:
      Fail += f'\n{cog}: {str(e)}'
if Success == True and Fail == "N/A":
  print(f'{Start_Decor}\n✅ Connecting Cogs\n{End_Decor}')
elif Success == True and not Fail == "N/A":
  print(f'{Start_Decor}\n✅ Connecting Cogs\n\n{Fail}\n{End_Decor}')
else:
  print(f"{Start_Decor}\n{Fail}\n{End_Decor}")

@client.slash_command()
async def main_test(ctx):
  await ctx.respond("Working", ephemeral = False)

## - Code Below --------------------------------------------------

client.run(os.environ.get("BOT_TOKEN"))

^^^ My Main file.

import discord
from discord.ext import commands
from datetime import datetime


class Secondary(commands.Cog):
  def __init__(self, client):
    
    self.client = client

  @commands.slash_command()
  async def cog_test(self, ctx):
    await ctx.respond("Working.", ephemeral = False)
      
def setup(client):
  client.add_cog(Secondary(client))

^^^ My cog file.

Solution

If you want to import your cog into your discord bot, you have to use the bot.load_extension() method which takes the file in parameter:

At the end of your main file:

my_files = ["YOUR FILES HERE WITHOUT EXTENSION"]
#For example, if my files are cog1.py and cog2.py and is located in the cogs folder:
my_files = ["cog1", "cog2"]

for file in my_files:
    bot.load_extension(f"cogs.{file}")

Don't forget to put the setup function in your cog file

See https://docs.pycord.dev/en/master/api.html?highlight=load_extension#discord.Bot.load_extension