[Python] How to select only one Webdriver to run the test

I am learning selenium with Pytest and have configured conftest.py like this

import pytest
from selenium import webdriver
from pages.homepage import HomePage

def pytest_addoption(parser):
parser.addoption('--platform', action='store', default='Chrome')

options=webdriver.EdgeOptions()
options.use_chromium=True
Edge_driver = webdriver.Edge(options=options)
Chrome_driver = webdriver.Chrome()

@pytest.fixture
def platform(request):

plat = request.config.getoption('platform').lower()

if plat not in ['MicrosoftEdge', 'Chrome']:
raise ValueError('--platform value must be MicrosoftEdge or Chrome')
return plat

@pytest.fixture
def driver():
if platform == 'MicrosoftEdge':
driver = Edge_driver
else:
driver = Chrome_driver

yield driver
driver._platform = platform
driver.quit()


when I type in the command line this

pytest --platform=MicrosoftEdge mytest.py

There are two browser opened, one is MicrosoftEdge the other is Chrome. Though the test only runs on the MicrosoftEdge, but why the Chrome is also opened without directing to any website in this case?

How can I make sure there is only one browser opened with the driver defined in the command line?

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