I'm new about using python and selenium and I'm trying to get the image source from a website. I'm actually finding elements by the tag name, but I don't know if it's the right way. Anyway it gives me an error:

InvalidArgumentException: Message: invalid argument: 'using' must be a string

Under this there's the code I wrote

from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.common.by import By
from webdriver_manager.chrome import ChromeDriverManager

PATH = Service("/Users/fscozano/documenti/chromedriver-2.exe")

print("setup")
driver = webdriver.Chrome(service=Service(ChromeDriverManager().install()))
driver.get("https://apod.nasa.gov/apod/random_apod.html")

tag = driver.find_element((By.TAG_NAME, "b")).getText()

print(tag)

driver.quit()

The error is in:

tag = driver.find_element((By.TAG_NAME, "b")).getText()

You can personally inspect the website because I really don't know how to solve this Every type of help is appreciated :)

CodePudding user response：

tag = driver.find_element((By.CSS_SELECTOR, "body > center:nth-child(1) > p:nth-child(3) > a > img"))    

You can grab this by css selector and then use

tag.get_attribute('src')

to get the src image value.

CodePudding user response：

The image source is within an <iframe> so you have to:

• Induce WebDriverWait for the desired frame to be available and switch to it.

• Induce WebDriverWait for the desired element to be clickable.

• You can use the following Locator Strategies:

  driver.get("https://apod.nasa.gov/apod/random_apod.html")
  WebDriverWait(driver, 20).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR,"iframe[src^='https://apod.nasa.gov/apod']")))
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//h1[normalize-space()='Astronomy Picture of the Day']//following::p[2]//a/img"))).get_attribute("src"))
  

• Console Output:

  https://apod.nasa.gov/apod/image/2111/MACSJ0138_Hubble_1080.jpg
  

• Note : You have to add the following imports :

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

Reference

You can find a couple of relevant discussions in:

• Ways to deal with #document under iframe
• Switch to an iframe through Selenium and python
• selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element while trying to click Next button with selenium
• selenium in python : NoSuchElementException: Message: no such element: Unable to locate element