Hello all!
We are currently dealing with a bot overloading the Wikidata Query Service. This bot does not look actively malicious, but does create enough load to disrupt the service. As a stop gap measure, we had to deny access to all bots using python-request user agent.
As a reminder, any bot should use a user agent that allows to identify it [1]. If you have trouble accessing WDQS, please check that you are following those guidelines.
More information and a proper incident report will be communicated as soon as we are on top of things again.
Thanks for your understanding!
Guillaume
[1] https://meta.wikimedia.org/wiki/User-Agent_policy