Selenium basic knowledge automatic search

from selenium import webdriver
import time
from selenium.webdriver.common.by import By

driver=webdriver.Edge()
driver.get("https://www.baidu.com")

inputTag=driver.find_element(By.ID,'kw')
time.sleep(2)
inputTag.send_keys('python')

submit=driver.find_element(By.ID,'su')
submit.click()

Automatic login Baidu network disk card in the button step Just try a simple button first This is feasible But this is also used id Positioning instead of class

Change to use class After positioning You can enter keywords But you can't click the button

from selenium import webdriver
import time
from selenium.webdriver.common.by import By

driver=webdriver.Edge()
driver.get("https://www.baidu.com")

inputTag=driver.find_element(By.CLASS_NAME,'s_ipt')
time.sleep(2)
inputTag.send_keys('python')

submit=driver.find_element(By.CLASS_NAME,'bg s_btn')
submit.click()

An error is as follows , Can't locate ：

Three changes

submit=driver.find_element(By.CLASS_NAME,'s_btn')
submit.click()

Change it to this way because classname There are spaces in So only take part
But I don't quite understand why I didn't locate the previous element
Reference resources ：selenium+python automation ——class location ：class Property has spaces