alfa2000

Здравствуйте! Использую WebDriver, Chrome 74, Python 3.4

Возникает следующая проблема: не могу передать значение в value из переменной

 

from selenium import webdriver

link = 'http://suninjuly.git.../selects1.html'
driver = webdriver.Chrome()
driver.get(link)
def calc(x, y):
    return str(int(x)+int(y))

a = driver.find_element_by_id("num1")
b = driver.find_element_by_id("num2")
ax = a.text
bx = b.text
c = calc(ax, bx)
print©

driver.find_element_by_id('dropdown').click()
driver.find_element_by_css_selector('[value="c"]').click()
driver.find_element_by_css_selector('button.btn').click()

Имею вот такую ошибку

 

Traceback (most recent call last):
  File "C:/Python34/Lessons/27.py", line 17, in <module>
    driver.find_element_by_css_selector('[value="c"]').click()
  File "C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 597, in find_element_by_css_selector
    return self.find_element(by=By.CSS_SELECTOR, value=css_selector)
  File "C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 966, in find_element
    'value': value})['value']
  File "C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 320, in execute
    self.error_handler.check_response(response)
  File "C:\Python34\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"css selector","selector":"[value="c"]"}
  (Session info: chrome=74.0.3729.169)
  (Driver info: chromedriver=74.0.3729.6 (255758eccf3d244491b8a1317aa76e1ce10d57e9-refs/branch-heads/3729@{#29}),platform=Windows NT 6.1.7601 SP1 x86_64)

Подскажите, пожалуйста.