Web scraping Selenium Error: "with AttributeError: 'list' object has no attribute 'find_element_by_class_name' "

The answer by Nikita has an explanation why your code produces this error. But the current implementation is very wrong.

1 You use multiple for loops. You do not need this

2 You use find_element_by_class_name for multiple class names. But this is not supported. You have to use either XPath or css selectors for multiple class names.

3 You are waiting like this: main = WebDriverWait(driver, 10).until( EC.presence_of_element_located((By.ID, "js-screener-container"))) But it will unlikely wait for the table contents.

4 You are waiting for elements to be present, but it is more reliable to wait till they are visible

Answering your main question: 'list' object has no attribute 'find_element_by_class_name' means that you are calling find_element_by_class_name method from list, which does not have it. You should use it like this:

driver. find_element_by_class_name("some_class")

I've started your code, so it would be easier for you to understand how the code really should looks like.

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

driver = webdriver.Chrome(executable_path='/snap/bin/chromium.chromedriver')
driver.get("https://www.tradingview.com/markets/stocks-usa/market-movers-active/")


main = WebDriverWait(driver, 10).until(
    EC.visibility_of_all_elements_located((By.CSS_SELECTOR, ".tv-data-table__tbody .tv-data-table__row.tv-data-table__stroke.tv-screener-table__result-row")))
companies = driver.find_elements_by_css_selector(".tv-data-table__tbody .tv-data-table__row.tv-data-table__stroke.tv-screener-table__result-row")
result = []
for company in companies:
    name_short = company.find_element_by_css_selector(".tv-screener__symbol.apply-common-tooltip").text
    name_long = company.find_element_by_css_selector(".tv-screener__description").text
    last = company.find_element_by_css_selector(".tv-data-table__cell.tv-screener-table__cell.tv-screener-table__cell--big.tv-screener-table__cell--with-marker:nth-of-type(2)>span").text
    result.append([name_short, name_long, last])
for p in result:
    print(p, sep='\n')

First 5 lines of the output:

['GERN', 'GERON CORPORATION', '1.83']
['AMC', 'AMC ENTERTAINMENT HOLDINGS, INC.', '59.26']
['XLF', 'SPDR SELECT SECTOR FUND - FINANCIAL ETF', '35.23']
['WISH', 'CONTEXTLOGIC INC.', '11.40']
['SNDL', 'SUNDIAL GROWERS INC.', '0.9230']

Some hints:

• Learn locators, specifically XPATH and CSS
• Learn how to work with lists
• Go through this tutorial to understand Selenium better https://selenium-python.readthedocs.io/
• Avoid multiple inner loops as much as you can. Otherwise your programs will be very slow and difficult to read.