code: def now(cls, tz=None):
          "Construct a datetime from time.time() and optional time zone info."
          t = _time.time()
          return cls.fromtimestamp(t, tzf now(cls, tz=None):
          "Construct a datetime from time.time() and optional time zone info."
          t = _time.time()
          return cls.fromtimestamp(t, tz)
docs: Construct a datetime from time.time() and optional time zone info.