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ready_to_read, ready_to_write, in_error = \
select.select(
potential_readers,
potential_writers,
potential_errs,
timeout)
https://docs.python.org/3/howto/sockets.html#disconnecting
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ready_to_read, ready_to_write, in_error = \
select.select(
potential_readers,
potential_writers,
potential_errs,
timeout)