@staticmethod<EOL><INDENT>def _from_timestamp(input):<DEDENT>
if not isinstance(input, numbers.Real):<EOL><INDENT>return input<EOL><DEDENT>return from_timestamp(input)<EOL>
If input is a real number, interpret it as a Unix timestamp
(seconds sinc Epoch in UTC) and return a timezone-aware
datetime object. Otherwise return input unchanged.