Get expression data. .. note:: Same interface as `expression` method in expression provider
(self, instrument, field, start_time, end_time, freq)
| 335 | """ |
| 336 | |
| 337 | def expression(self, instrument, field, start_time, end_time, freq): |
| 338 | """Get expression data. |
| 339 | |
| 340 | .. note:: Same interface as `expression` method in expression provider |
| 341 | """ |
| 342 | try: |
| 343 | return self._expression(instrument, field, start_time, end_time, freq) |
| 344 | except NotImplementedError: |
| 345 | return self.provider.expression(instrument, field, start_time, end_time, freq) |
| 346 | |
| 347 | def _uri(self, instrument, field, start_time, end_time, freq): |
| 348 | """Get expression cache file uri. |