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