[Python] How to calculate amount of call center's operators? Erlang Calculator on python

I have stuck with a problem of predicting how many operators are needed for call center to answer the calls (80%) in less than 20 seconds (in queue). Just something like this Erlang Calculator

But I need to implement that in a python script. I did found basic Erlang-c formula but it only returns probability that an arriving customer will need to queue.

Appreciate any help!

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