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PERF: cache plotting date locators for DatetimeIndex plotting #58992

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Merged
merged 2 commits into from
Jun 13, 2024
Merged

PERF: cache plotting date locators for DatetimeIndex plotting #58992

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PERF: cache plotting date locators for DatetimeIndex plotting
mroeschke Jun 12, 2024
efec20f
Type vmin, vmax
mroeschke Jun 13, 2024
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4 changes: 4 additions & 0 deletions pandas/plotting/_matplotlib/converter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -556,6 +556,7 @@ def _get_periods_per_ymd(freq: BaseOffset) -> tuple[int, int, int]:
return ppd, ppm, ppy


@functools.cache
def _daily_finder(vmin, vmax, freq: BaseOffset) -> np.ndarray:
# error: "BaseOffset" has no attribute "_period_dtype_code"
dtype_code = freq._period_dtype_code # type: ignore[attr-defined]
Expand Down Expand Up @@ -755,6 +756,7 @@ def _second_finder(label_interval: int) -> None:
return info


@functools.cache
def _monthly_finder(vmin, vmax, freq: BaseOffset) -> np.ndarray:
_, _, periodsperyear = _get_periods_per_ymd(freq)

Expand Down Expand Up @@ -826,6 +828,7 @@ def _monthly_finder(vmin, vmax, freq: BaseOffset) -> np.ndarray:
return info


@functools.cache
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No chance of getting non-hashable inputs?

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I think vmax/vmin are always floats. I'll type these so we have some validation

def _quarterly_finder(vmin, vmax, freq: BaseOffset) -> np.ndarray:
_, _, periodsperyear = _get_periods_per_ymd(freq)
vmin_orig = vmin
Expand Down Expand Up @@ -873,6 +876,7 @@ def _quarterly_finder(vmin, vmax, freq: BaseOffset) -> np.ndarray:
return info


@functools.cache
def _annual_finder(vmin, vmax, freq: BaseOffset) -> np.ndarray:
# Note: small difference here vs other finders in adding 1 to vmax
(vmin, vmax) = (int(vmin), int(vmax + 1))
Expand Down