嘗試使用Selenium Python自動化優惠券代碼輸入

Question

好吧，我是16歲，並且是Python新手。我需要做的項目，以幫助我學習，所以我想出了一個PlayStation加代碼生成器作爲一個項目，到目前爲止，它的作用：

-Generates代碼 -logs在索尼的網站 -Enters到賬戶管理在代碼段贖回 - 檢查是否發生錯誤

voucher_box = driver.find_element_by_id("voucherCode") 
redeem_button = driver.find_element_by_id("redeemGiftCardButton") 
while i < amount: 
    voucher_box.clear() 
    currentcode = codegen.codegen() 
    voucher_box.send_keys(currentcode) 
    redeem_button.click() 
    if "The Prepaid Card code you entered is incorrect or is no longer valid" in driver.page_source: 
     print("Error found") 
    else: 
     print("Error not found") 
    i += 1 

它的工作原理完全正常，如果只進行一次，但如果舉例來說，我設置金額2，我讓我的錯誤消息「發現」，然後崩潰和給我這個：

Traceback (most recent call last): 
    File "C:/Users/M4SS3CR3/PycharmProjects/UKP/main.py", line 38, in <module> 
    voucher_box.clear() 
    File "C:\Users\M4SS3CR3\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\webelement.py", line 87, in clear 
    self._execute(Command.CLEAR_ELEMENT) 
    File "C:\Users\M4SS3CR3\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\webelement.py", line 461, in _execute 
    return self._parent.execute(command, params) 
    File "C:\Users\M4SS3CR3\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 236, in execute 
    self.error_handler.check_response(response) 
    File "C:\Users\M4SS3CR3\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 192, in check_response 
    raise exception_class(message, screen, stacktrace) 
selenium.common.exceptions.StaleElementReferenceException: Message: Element not found in the cache - perhaps the page has changed since it was looked up 
Stacktrace: 
    at fxdriver.cache.getElementAt (resource://fxdriver/modules/web-element-cache.js:9454) 
    at Utils.getElementAt (file:///C:/Users/M4SS3CR3/AppData/Local/Temp/tmpn3rxlnty/extensions/fxdriver@googlecode.com/components/command-processor.js:9039) 
    at fxdriver.preconditions.visible (file:///C:/Users/M4SS3CR3/AppData/Local/Temp/tmpn3rxlnty/extensions/fxdriver@googlecode.com/components/command-processor.js:10090) 
    at DelayedCommand.prototype.checkPreconditions_ (file:///C:/Users/M4SS3CR3/AppData/Local/Temp/tmpn3rxlnty/extensions/fxdriver@googlecode.com/components/command-processor.js:12644) 
    at DelayedCommand.prototype.executeInternal_/h (file:///C:/Users/M4SS3CR3/AppData/Local/Temp/tmpn3rxlnty/extensions/fxdriver@googlecode.com/components/command-processor.js:12661) 
    at DelayedCommand.prototype.executeInternal_ (file:///C:/Users/M4SS3CR3/AppData/Local/Temp/tmpn3rxlnty/extensions/fxdriver@googlecode.com/components/command-processor.js:12666) 
    at DelayedCommand.prototype.execute/< (file:///C:/Users/M4SS3CR3/AppData/Local/Temp/tmpn3rxlnty/extensions/fxdriver@googlecode.com/components/command-processor.js:12608) 

任何幫助或建議，將不勝感激，如果這不夠詳細，我很抱歉。

Answer 1

這是我在評論

while i < amount: 
    try: 
     counter = 0 
     # make sure that the elements can be found 
     # try ten times and then break out of loop 
     while counter < 10: 
     try: 
      voucher_box = driver.find_element_by_id("voucherCode") 
      redeem_button = driver.find_element_by_id("redeemGiftCardButton") 
      break 
     except: 
      time.sleep(1) 
      counter += 1 

     voucher_box.clear() 
     currentcode = codegen.codegen() 
     voucher_box.send_keys(currentcode) 
     redeem_button.click() 
     if "The Prepaid Card code you entered is incorrect or is no longer valid" in driver.page_source: 
      print("Error found") 
     else: 
      print("Error not found") 
     i += 1 
     driver.get("my page") # may not need this line because the elements were moved inside the while loop 
     time.sleep(3) # give the page enough time to load 
    except: 
     pass 

你也可以去，只要像做html.find（ID）中提到的想法> -1：做其他事情的ID WASN」 t出現在頁面上，因此退出或重新加載。此外，更那麼別的就可能更好地移動

voucher_box = driver.find_element_by_id("voucherCode") 
      redeem_button = driver.find_element_by_id("redeemGiftCardButton") 

while循環中，因爲，這樣的目標是通過everyloop正確的對象。可能發生的事情是，您正在使用屬於不同dom的元素。