Returns True if downsampling is possible between source and target frequencies Parameters ---------- source : str or DateOffset Frequency converting from target : str or DateOffset Frequency converting to Returns ------- bool
(source, target)
| 453 | |
| 454 | |
| 455 | def is_subperiod(source, target) -> bool: |
| 456 | """ |
| 457 | Returns True if downsampling is possible between source and target |
| 458 | frequencies |
| 459 | |
| 460 | Parameters |
| 461 | ---------- |
| 462 | source : str or DateOffset |
| 463 | Frequency converting from |
| 464 | target : str or DateOffset |
| 465 | Frequency converting to |
| 466 | |
| 467 | Returns |
| 468 | ------- |
| 469 | bool |
| 470 | """ |
| 471 | if target is None or source is None: |
| 472 | return False |
| 473 | source = _maybe_coerce_freq(source) |
| 474 | target = _maybe_coerce_freq(target) |
| 475 | |
| 476 | if _is_annual(target): |
| 477 | if _is_quarterly(source): |
| 478 | return _quarter_months_conform( |
| 479 | get_rule_month(source), get_rule_month(target) |
| 480 | ) |
| 481 | return source in {"D", "C", "B", "M", "h", "min", "s", "ms", "us", "ns"} |
| 482 | elif _is_quarterly(target): |
| 483 | return source in {"D", "C", "B", "M", "h", "min", "s", "ms", "us", "ns"} |
| 484 | elif _is_monthly(target): |
| 485 | return source in {"D", "C", "B", "h", "min", "s", "ms", "us", "ns"} |
| 486 | elif _is_weekly(target): |
| 487 | return source in {target, "D", "C", "B", "h", "min", "s", "ms", "us", "ns"} |
| 488 | elif target == "B": |
| 489 | return source in {"B", "h", "min", "s", "ms", "us", "ns"} |
| 490 | elif target == "C": |
| 491 | return source in {"C", "h", "min", "s", "ms", "us", "ns"} |
| 492 | elif target == "D": |
| 493 | return source in {"D", "h", "min", "s", "ms", "us", "ns"} |
| 494 | elif target == "h": |
| 495 | return source in {"h", "min", "s", "ms", "us", "ns"} |
| 496 | elif target == "min": |
| 497 | return source in {"min", "s", "ms", "us", "ns"} |
| 498 | elif target == "s": |
| 499 | return source in {"s", "ms", "us", "ns"} |
| 500 | elif target == "ms": |
| 501 | return source in {"ms", "us", "ns"} |
| 502 | elif target == "us": |
| 503 | return source in {"us", "ns"} |
| 504 | elif target == "ns": |
| 505 | return source in {"ns"} |
| 506 | else: |
| 507 | return False |
| 508 | |
| 509 | |
| 510 | def is_superperiod(source, target) -> bool: |