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Otherwise, you can hit errors with tracebacks like
Traceback (most recent call last):
...
File ".../kmip/pie/client.py", line 1573, in __enter__
self.open()
File ".../kmip/pie/client.py", line 135, in open
raise e
IOError: [Errno 2] No such file or directory
... which isn't terribly useful; it doesn't give you any information
about *what* file wasn't found. By using a bare `raise`, you preserve
the rest of the stack and get
Traceback (most recent call last):
...
File ".../kmip/pie/client.py", line 1573, in __enter__
self.open()
File ".../kmip/pie/client.py", line 131, in open
self.proxy.open()
File ".../kmip/services/kmip_client.py", line 221, in open
self._create_socket(sock)
File ".../kmip/services/kmip_client.py", line 246, in _create_socket
suppress_ragged_eofs=self.suppress_ragged_eofs)
File ".../eventlet/green/ssl.py", line 379, in wrap_socket
return GreenSSLSocket(sock, *a, **kw)
File ".../eventlet/green/ssl.py", line 68, in __init__
ca_certs, do_handshake_on_connect and six.PY2, *args, **kw)
File ".../ssl.py", line 558, in __init__
self._context.load_verify_locations(ca_certs)
IOError: [Errno 2] No such file or directory
... which makes it clear that it was a problem with the CA certificate
bundle.