当我运行我写的代码时，它只将browser.get('https://www.instagram.com/accounts/password/reset/')输入到我在这里指定的web。没有任何变化，

username_input = driver.find_element_by_name('username')
NameError: name 'driver' is not defined. Did you mean: 'webdriver'?

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会是什么原因呢？我写的代码：

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from time import sleep
browser = webdriver.Firefox()
browser.get('https://www.instagram.com/accounts/password/reset/')
sleep(2)
username_input = driver.find_element_by_name('username')
username_input.send_keys(username)
username_input.send_keys(Keys.ENTER)
sleep(2)
email_input = driver.find_element_by_name('email')
email_input.send_keys(Keys.ENTER)
sleep(2)
driver.quit()
username = '...'
email = '...'
reset_instagram_password(username, email)

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