[Tutor] checking connection to internet until success

[Alan Gauld]

On 01/01/18 21:38, Pi wrote:
> with this code i am getting actual date from internet. I need correct 
> date, because i am not sure this set on computer is right.

The first obvious pointto make is that all modern OS come
with an option to read the date/time from an internet time
server so this is the correct solution to your problem
rather than writing a web scraper. At the very least you
should access a time server directly rather than scrape
a web site. (try the ntplib module)

But if you do want to try doing it yourself...

> import requests, time
> 
> try:
>      OnLineDate = requests.get("http://just-the-time.appspot.com").text[:10]
>      OffLineDate = time.strftime("%Y-%m-%d")>
>      if OnLineDate == OffLineDate:
>          do_something
>      else:
>          do_something_else
> except requests.ConnectionError:
>      print("Can not connect.")
> 
> 
> But this code is run once. And i am stuck. Tries with while loop doesnt 
> took any advance.

WE need to see what doesn't work to comment. A while loop
with a suitable sleep() should work.

But again it's probably better to use the OS to set up
a timed job.

On Unix this is done either with 'cron' or 'at'.
On Windows I believe 'at' is the tool.
There are other schedulers available too with GUIs etc.

> how check connection to internet to check for every lets say 30 seconds 
> until success?

What is success? When the times match? Or when they don't?
Or just whenever you succesfully connect?

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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