Python Selenium: Global driver - 'driver' is not defined in the global scope - selenium

Question

the source itself works, but I have the problem that the global driver is undefined, only in VsCode. When I run the source in pycharm, that problem does not exist. Unfortunately, I really do not know how to continue.
The Issue: 'driver' is not defined in the global scope
I used Python 3.7.2 with pytest
from selenium import webdriver
import pytest
from selenium.webdriver.common.keys import Keys
def test_setup():
global driver
driver = webdriver.Chrome(executable_path="e:/Webdriver/chromedriver.exe")
driver.implicitly_wait(10)
driver.maximize_window()
def test_login():
driver.get("http://www.dev-crowd.com/wp-login.php")
driver.find_element_by_id("user_login").send_keys("abc")
driver.find_element_by_id("user_pass").send_keys("cab")
driver.find_element_by_id("wp-submit").click()
x = driver.title("abc")
assert X == "abc"
def test_teardown():
driver.close()
driver.quit()
print("Test completed")

Answer 1

The following should work, but i think it should not be necessary:
from selenium import webdriver
import pytest
from selenium.webdriver.common.keys import Keys
driver = None
def test_setup():
driver = webdriver.Chrome(executable_path="e:/Webdriver/chromedriver.exe")
driver.implicitly_wait(10)
driver.maximize_window()
def test_login():
driver.get("http://www.dev-crowd.com/wp-login.php")
driver.find_element_by_id("user_login").send_keys("abc")
driver.find_element_by_id("user_pass").send_keys("cab")
driver.find_element_by_id("wp-submit").click()
x = driver.title("abc")
assert x == "abc"
def test_teardown():
driver.close()
driver.quit()
print("Test completed")