Python - SSL - wrong version number
I don't know Python at all to tell you if you have a problem in your code.
The error though is clear. The client supports SSLv3 and your server only TLSv1.
So you should enable support for SSLv3 or upgrade your client.
This line seems to be the problem:ssl_version=ssl.PROTOCOL_TLSv1. Perhaps you can also add SSLv3 here?
Update:
I see that you have problem between browsers. See if SSLv3 is enabled in Crome.
In IE for example this is under Internet Options-> Advanced Tab.
Something similar should be in Chrome. Disable SSv3 and enable TLSv1 instead