学习Selenium并获取ImportError：无法导入名称webdriver

Question

我使用所需的包创建了virtualenv。激活了环境。现在我继续得到以下内容：ImportError: cannot import name webdriver。我检查了我的环境，我的所有文件似乎都是正确的。谁能提供输入？我包括代码丢弃链接和屏幕截图。

https://drive.google.com/open?id=1jzVoBilX9pU3CYC2czQ3IBRE87sCWJ3k

import time
from selenium import webdriver    # this is the offending line
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import TimeoutException


def init_driver():
    driver = webdriver.Firefox()
    driver.wait = WebDriverWait(driver, 5)
    return driver


def lookup(driver, query):
    driver.get("http://www.google.com")
    try:
        box = driver.wait.until(EC.presence_of_element_located(
            (By.NAME, "q")))
        button = driver.wait.until(EC.element_to_be_clickable(
            (By.NAME, "btnK")))
        box.send_keys(query)
        button.click()
    except TimeoutException:
        print("Box or Button not found in google.com")


if __name__ == "__main__":
    driver = init_driver()
    lookup(driver, "Selenium")
    time.sleep(5)
    driver.quit()