Upgrade the mapper of a StringConverter by adding a new function and its corresponding default. The input function (or sequence of functions) and its associated default value (if any) is inserted in penultimate position of the mapper. The corresponding type
(cls, func, default=None)
| 541 | |
| 542 | @classmethod |
| 543 | def upgrade_mapper(cls, func, default=None): |
| 544 | """ |
| 545 | Upgrade the mapper of a StringConverter by adding a new function and |
| 546 | its corresponding default. |
| 547 | |
| 548 | The input function (or sequence of functions) and its associated |
| 549 | default value (if any) is inserted in penultimate position of the |
| 550 | mapper. The corresponding type is estimated from the dtype of the |
| 551 | default value. |
| 552 | |
| 553 | Parameters |
| 554 | ---------- |
| 555 | func : var |
| 556 | Function, or sequence of functions |
| 557 | |
| 558 | Examples |
| 559 | -------- |
| 560 | >>> import dateutil.parser |
| 561 | >>> import datetime |
| 562 | >>> dateparser = dateutil.parser.parse |
| 563 | >>> defaultdate = datetime.date(2000, 1, 1) |
| 564 | >>> StringConverter.upgrade_mapper(dateparser, default=defaultdate) |
| 565 | """ |
| 566 | # Func is a single functions |
| 567 | if hasattr(func, '__call__'): |
| 568 | cls._mapper.insert(-1, (cls._getsubdtype(default), func, default)) |
| 569 | return |
| 570 | elif hasattr(func, '__iter__'): |
| 571 | if isinstance(func[0], (tuple, list)): |
| 572 | for _ in func: |
| 573 | cls._mapper.insert(-1, _) |
| 574 | return |
| 575 | if default is None: |
| 576 | default = [None] * len(func) |
| 577 | else: |
| 578 | default = list(default) |
| 579 | default.append([None] * (len(func) - len(default))) |
| 580 | for fct, dft in zip(func, default): |
| 581 | cls._mapper.insert(-1, (cls._getsubdtype(dft), fct, dft)) |
| 582 | |
| 583 | @classmethod |
| 584 | def _find_map_entry(cls, dtype): |