Selenium Python: execute_script is executing only once in a loop - python-3.x

Question

I want to perform following task 3 times without closing browser.
Open Google.com in a Tab.
Open New Tab
Then close tab containing Google.com
Open Google.com in previous newly opened tab.
I am using following code to open new tab:
browser.execute_script("window.open('', 'new_tab')")
But when executed in a loop it only gets executed once.
I have printed Number of Window Handles which suggests that execute_script is executed only once.
My Full Code:
cpath="C:/Users/Gupta Niwas/Downloads/Softwares/Browsers/Drivers/chromedriver_win32/chromedriver.exe"
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument("--incognito")
chrome_options.add_argument("start-maximized")
#browser = webdriver.Firefox(executable_path=fpath)
browser = webdriver.Chrome(chrome_options=chrome_options,executable_path=cpath)
for i in range(3):
browser.get("https://google.com")
print(len(browser.window_handles))
print("current:",browser.current_window_handle)
browser.execute_script("window.open('', 'new_tab')")
print(len(browser.window_handles))
next_tab=browser.window_handles[len(browser.window_handles)-1]
print(next_tab)
print(browser.title)
browser.close()
print(len(browser.window_handles))
browser.switch_to_window(next_tab)
browser.delete_all_cookies()
On the 2nd loop it throws an Exception:
runfile('C:/Users/Gupta Niwas/Downloads/Programming/Projects/Mi/temp5.py',
wdir='C:/Users/Gupta Niwas/Downloads/Programming/Projects/Mi')
1
current: CDwindow-75E62D95A2A8A7808C5AC369A8070641
2
CDwindow-F1C8AFC0E5742A2E55CEA17FCD951D1D
Google
1
1
current: CDwindow-F1C8AFC0E5742A2E55CEA17FCD951D1D
1
CDwindow-F1C8AFC0E5742A2E55CEA17FCD951D1D
Google
Traceback (most recent call last):
File "<ipython-input-1-12046950abfa>", line 1, in <module>
runfile('C:/Users/Gupta Niwas/Downloads/Programming/Projects/Mi/temp5.py', wdir='C:/Users/Gupta Niwas/Downloads/Programming/Projects/Mi')
File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 705, in runfile
execfile(filename, namespace)
File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "C:/Users/Gupta Niwas/Downloads/Programming/Projects/Mi/temp5.py", line 34, in <module>
print(len(browser.window_handles))
File "C:\ProgramData\Anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 719, in window_handles
return self.execute(Command.GET_WINDOW_HANDLES)['value']
File "C:\ProgramData\Anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 314, in execute
self.error_handler.check_response(response)
File "C:\ProgramData\Anaconda3\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
WebDriverException: no such session
(Driver info: chromedriver=2.40.565498 (ea082db3280dd6843ebfb08a625e3eb905c4f5ab),platform=Windows NT 10.0.17134 x86_64)

Answer 1

I think here is a problem:
next_tab = browser.window_handles[len(browser.window_handles)-1]
Your next_tab is getting a current window reference. And when you are closing current window:
browser.close()
You cannot switch to next_tab, because it is not exists. I suggest you to debug your code and find out which value should you have in browser.window_handles[?]