Using debian buster and python3.7, I cannot connect to the bcfg2 server as python3.7 deprecated the following behavior:
Unknown failure: SSLSocket does not have a public constructor. Instances are returned by SSLContext.wrap_socket(). (TypeError) Fatal error: Failed to declare version: Unknown failure: SSLSocket does not have a public constructor. Instances are returned by SSLCont ext.wrap_socket(). (TypeError)

See also:
python/cpython@89c2051