PubNub Tornado Docs

Reconnection Policies Tutorial for Python-Tornado

Python version support

Python SDK versions 5.0.0 and higher no longer support Python v2.7 and the Twisted and Tornado frameworks. If you require support for any of these, use SDK version 4.8.1.

Note that PubNub will stop supporting versions of Python lower than 3.7 by the end of 2021.

Reconnection Policies

Python SDK has three types of Reconnection Policies when there is a network or internet issue.

  1. (default) PNReconnectionPolicy.NONE - indicates that NO action will taken when there is a network or internet issue.
  2. PNReconnectionPolicy.LINEAR - SDK will try to reconnect each 3 seconds.
  3. PNReconnectionPolicy.EXPONENTIAL - SDK uses the Exponential Backoff algorithm to reconnect when there is a network or internet issue. SDK uses MINEXPONENTIALBACKOFF = 1 second and MAXEXPONENTIALBACKOFF = 32 seconds. See: https://en.wikipedia.org/wiki/Exponential_backoff for more details.
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