You can try something like
browser = webdriver.Firefox()
browser.get(url)
WebDriverWait(browser, 10).until(EC.element_to_be_clickable((By.LINK_TEXT, 'some link text')))
Essentially the above lines launch Firefox, navigate to the specified url, cause the browser to hold for 10 seconds, for some url to load then look for a specific link text, if no link text is found, a TimeoutException is triggered.
Please note the number of brackets used, you will run into errors if the number of brackets does not correspond like the above.
To be able to run the above statement, the following must have been declared
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
This uses "element_to_be_clickable" - a full list of wait-conditions can be found here: Selenium Python: Waits