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Thanks for the report. This appears to be another instance of a long-standing unresolved problem when using networks functions in a thread application on macOS that invoke Python's _scproxy helper module to obtain possible network proxy configuration info from macOS. For more details see, for example, Issue13829. Assuming your application does not need to connect through a network proxy, suggest trying the workaround in https://bugs.python.org/issue30385#msg293958 which avoids the call to _scproxy by defining the no_proxy environment variable.