def _maybe_cast_slice_bound(self, label, side: str, kind: str): """ If label is a string or a datetime, cast it to Period.ordinal according to resolution. Parameters ---------- label : object side : {'left', 'right'} kind : {'loc', 'getitem'} Returns ------- bound : Period or object Notes ----- Value of `side` parameter should be validated in caller. """ assert kind in ["loc", "getitem"] if isinstance(label, datetime): return Period(label, freq=self.freq) elif isinstance(label, str): try: parsed, reso = parse_time_string(label, self.freq) reso = Resolution.from_attrname(reso) bounds = self._parsed_string_to_bounds(reso, parsed) return bounds[0 if side == "left" else 1] except ValueError as err: # string cannot be parsed as datetime-like # TODO: we need tests for this case raise KeyError(label) from err elif is_integer(label) or is_float(label): self._invalid_indexer("slice", label) return label
def _maybe_cast_slice_bound(self, label, side: str, kind): """ If label is a string, cast it to datetime according to resolution. Parameters ---------- label : object side : {'left', 'right'} kind : {'loc', 'getitem'} or None Returns ------- label : object Notes ----- Value of `side` parameter should be validated in caller. """ assert kind in ["loc", "getitem", None] if is_float(label) or isinstance(label, time) or is_integer(label): self._invalid_indexer("slice", label) if isinstance(label, str): freq = getattr(self, "freqstr", getattr(self, "inferred_freq", None)) parsed, reso = parsing.parse_time_string(label, freq) reso = Resolution.from_attrname(reso) lower, upper = self._parsed_string_to_bounds(reso, parsed) # lower, upper form the half-open interval: # [parsed, parsed + 1 freq) # because label may be passed to searchsorted # the bounds need swapped if index is reverse sorted and has a # length > 1 (is_monotonic_decreasing gives True for empty # and length 1 index) if self._is_strictly_monotonic_decreasing and len(self) > 1: return upper if side == "left" else lower return lower if side == "left" else upper return self._maybe_cast_for_get_loc(label)
def _parse_with_reso(self, label: str): # overridden by TimedeltaIndex parsed, reso_str = parsing.parse_time_string(label, self.freq) reso = Resolution.from_attrname(reso_str) return parsed, reso
def get_loc(self, key, method=None, tolerance=None): """ Get integer location for requested label. Parameters ---------- key : Period, NaT, str, or datetime String or datetime key must be parsable as Period. Returns ------- loc : int or ndarray[int64] Raises ------ KeyError Key is not present in the index. TypeError If key is listlike or otherwise not hashable. """ orig_key = key if not is_scalar(key): raise InvalidIndexError(key) if isinstance(key, str): try: loc = self._get_string_slice(key) return loc except (TypeError, ValueError): pass try: asdt, reso = parse_time_string(key, self.freq) except (ValueError, DateParseError) as err: # A string with invalid format raise KeyError(f"Cannot interpret '{key}' as period") from err reso = Resolution.from_attrname(reso) grp = reso.freq_group freqn = self.dtype.freq_group # _get_string_slice will handle cases where grp < freqn assert grp >= freqn # BusinessDay is a bit strange. It has a *lower* code, but we never parse # a string as "BusinessDay" resolution, just Day. if grp == freqn or ( reso == Resolution.RESO_DAY and self.dtype.freq.name == "B" ): key = Period(asdt, freq=self.freq) loc = self.get_loc(key, method=method, tolerance=tolerance) return loc elif method is None: raise KeyError(key) else: key = asdt elif is_integer(key): # Period constructor will cast to string, which we dont want raise KeyError(key) try: key = Period(key, freq=self.freq) except ValueError as err: # we cannot construct the Period raise KeyError(orig_key) from err try: return Index.get_loc(self, key, method, tolerance) except KeyError as err: raise KeyError(orig_key) from err
def _get_string_slice(self, key: str): freq = getattr(self, "freqstr", getattr(self, "inferred_freq", None)) parsed, reso_str = parsing.parse_time_string(key, freq) reso = Resolution.from_attrname(reso_str) return self._partial_date_slice(reso, parsed)
def get_loc(self, key, method=None, tolerance=None): """ Get integer location for requested label. Parameters ---------- key : Period, NaT, str, or datetime String or datetime key must be parsable as Period. Returns ------- loc : int or ndarray[int64] Raises ------ KeyError Key is not present in the index. TypeError If key is listlike or otherwise not hashable. """ orig_key = key if not is_scalar(key): raise InvalidIndexError(key) if is_valid_na_for_dtype(key, self.dtype): key = NaT elif isinstance(key, str): try: loc = self._get_string_slice(key) return loc except (TypeError, ValueError): pass try: asdt, reso_str = parse_time_string(key, self.freq) except (ValueError, DateParseError) as err: # A string with invalid format raise KeyError(f"Cannot interpret '{key}' as period") from err reso = Resolution.from_attrname(reso_str) grp = reso.freq_group.value freqn = self.dtype.freq_group_code # _get_string_slice will handle cases where grp < freqn assert grp >= freqn # BusinessDay is a bit strange. It has a *lower* code, but we never parse # a string as "BusinessDay" resolution, just Day. if grp == freqn or (reso == Resolution.RESO_DAY and self.dtype.freq.name == "B"): key = Period(asdt, freq=self.freq) loc = self.get_loc(key, method=method, tolerance=tolerance) return loc elif method is None: raise KeyError(key) else: key = asdt elif isinstance(key, Period): sfreq = self.freq kfreq = key.freq if not (sfreq.n == kfreq.n and sfreq._period_dtype_code == kfreq._period_dtype_code): # GH#42247 For the subset of DateOffsets that can be Period freqs, # checking these two attributes is sufficient to check equality, # and much more performant than `self.freq == key.freq` raise KeyError(key) elif isinstance(key, datetime): try: key = Period(key, freq=self.freq) except ValueError as err: # we cannot construct the Period raise KeyError(orig_key) from err else: # in particular integer, which Period constructor would cast to string raise KeyError(key) try: key = Period(key, freq=self.freq) except ValueError as err: # we cannot construct the Period raise KeyError(orig_key) from err try: return Index.get_loc(self, key, method, tolerance) except KeyError as err: raise KeyError(orig_key) from err
def _get_string_slice(self, key: str, use_lhs: bool = True, use_rhs: bool = True): freq = getattr(self, "freqstr", getattr(self, "inferred_freq", None)) parsed, reso = parsing.parse_time_string(key, freq) reso = Resolution.from_attrname(reso) loc = self._partial_date_slice(reso, parsed, use_lhs=use_lhs, use_rhs=use_rhs) return loc