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In native xy.pyplot, pandas datetime-indexed Series.plot() / DataFrame.plot() had two problems:
Period numbers instead of dates. pandas 3.1 passes ax.plot() the raw integers behind its PeriodIndex (asi8) where 3.0 passed Period objects. The shim left those integers alone, so ax.get_xlim()[0] came out as 15340.0 instead of 1325376000000.0. Business-day (freq="B") series take a separate pandas path with their own day counts and had the same problem.
PNG export crash. pandas' minor TimeSeries_Date* locator and formatter were stored and then called during export, raising NotImplementedError: Derived must override. Only the major setters were guarded before.
Fix (python/xy/pyplot/_axes.py)
_restore_pandas_period_timestamps converts the integers back to timestamps. It only does this when the array shares memory with, and equals, the index pandas just recorded in ax._plot_data. A later numeric overlay keeps its own units, even when its values match period numbers (e.g. [0, 1, 2] after a daily index that starts on 1970-01-01). Business-day numbers are converted with np.busday_offset from the epoch, which is pandas' own inverse. Checks are duck-typed, so the shim never imports pandas.
set_minor_locator / set_minor_formatter now ignore pandas' tickers, as the major setters already did.
Tests
tests/pyplot/test_pdsh_gap_features.py: daily, monthly, hourly and business-day indexes, each as a Series and a DataFrame. Each checks datetime xdata, millisecond get_xdata(orig=False) and limits, and PNG export. Also new: a numeric-overlay test and a pandas minor-ticker test. All new tests, plus the existing test_pandas_datetime_series_plot_completes, fail before the fix.
New corpus case tests/pyplot/corpus/59_pandas_datetime_plot.py reproduces the export failure before the fix. It now passes the native corpus run and the comparison against Matplotlib 3.11.
pandas' plotting backend imports Matplotlib itself. A REQUIRES table in test_corpus.py skips this case where pandas or Matplotlib is missing and keeps it out of the Matplotlib-blocked boundary test. xy.pyplot itself is still asserted Matplotlib-free.
pandas>=3 added to the dev group, so CI runs this path. pandas is not a runtime dependency. uv.lock and docs/app/uv.lock updated.
Focused tests also pass on pandas 3.0.3.
Spec / changelog
spec/matplotlib/compat.md: updated the datetime coordinates row and the corpus paragraph.
news/549.bugfix.md
Validation
uv run --with pre-commit pre-commit run --all-files, ruff check, ruff format --check, ty check: pass
…549)
pandas 3.1 plots a datetime-indexed Series/DataFrame by passing ax.plot()
its PeriodIndex.asi8 ordinals (business-day series: busday_count ordinals)
instead of Period objects, so the native shim plotted raw ordinals
(first xlim 15340.0 rather than 1325376000000.0). Map those integers back to
timestamps only when they share storage with, and equal, the index pandas
just recorded in ax._plot_data, so ordinary numeric overlays keep their units.
pandas' minor TimeSeries_Date* locator/formatter were stored and then called
during export, raising NotImplementedError; apply the existing major-ticker
units-registry guard to the minor setters too.
Adds pandas to the dev group, regression tests for daily/monthly/hourly/
business-day Series and DataFrames, a numeric-overlay and minor-ticker test,
corpus case 59_pandas_datetime_plot.py (declared as needing pandas and
matplotlib for its input library), and the compat spec update.
No actionable comments were generated in the recent review.
Walkthrough
Native xy.pyplot restores pandas datetime-index coordinates to epoch-millisecond timestamps and ignores pandas minor date tickers. Tests cover date frequencies, numeric overlays, PNG export, and optional pandas-based corpus execution.
Changes: Pandas datetime plotting
Layer / File(s)
Summary
Restore pandas coordinates and handle minor tickers python/xy/pyplot/_axes.py, tests/pyplot/test_pdsh_gap_features.py, spec/matplotlib/compat.md, news/549.bugfix.md
Axes.plot restores pandas period and business-day ordinals only when they match the active plot record’s index storage and values. Pandas minor locators and formatters are ignored. Tests cover date coordinates, limits, numeric overlays, and PNG export.
Run pandas plotting examples when inputs are available pyproject.toml, tests/pyplot/corpus/*, tests/pyplot/test_corpus.py, tests/pyplot/test_boundaries.py, tests/pyplot/test_reference_corpus.py, spec/matplotlib/compat.md
Pandas is added to the development dependencies. Corpus snippets can declare required modules, and the corpus runners skip snippets when required inputs are unavailable. The new pandas plotting snippet exercises daily, monthly, and hourly indexes.
reflex-dev/xy#489: Updates client WebGL transforms to preserve precision for large epoch-millisecond coordinates passed to the renderer.
Suggested reviewers:sselvakumaran, alek99
Merge Risk: Minimal · up to 86204
No identified current-head issue blocks merging; optional pandas plotting coverage now skips cleanly without Matplotlib and runs with the pinned CI backend.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
Check name
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Explanation
Resolution
Docstring Coverage
Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Status
Explanation
Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title clearly and concisely identifies the main change: preserving calendar coordinates for pandas datetime plots in pyplot.
Linked Issues check
Issue #549 is the only directly linked issue and remains open. The change restores pandas period and business-day integer coordinates only when the plotted array shares storage with and matches the re…
Out of Scope Changes check
The changed source implements the coordinate restoration and minor-ticker guard required by #549. The changed tests, corpus dependency skips, boundary handling, specification text, news fragment, deve…
Full details: Linked Issues check
Explanation
Issue #549 is the only directly linked issue and remains open. The change restores pandas period and business-day integer coordinates only when the plotted array shares storage with and matches the recorded pandas index. It preserves canonical millisecond x-data and limits for daily, monthly, hourly, and business-day Series and DataFrame plots. It preserves numeric overlay units, including the epoch [0, 1, 2] case. It ignores pandas minor locators and formatters, which prevents the reported PNG export failure. Regression tests and the corpus case cover these behaviors. pandas>=3 is in the development group only, so pandas remains optional at runtime. The tests are version-agnostic, and the reported focused pandas 3.0.3 run supplements coverage of the pandas 3.0 path.
Full details: Out of Scope Changes check
Explanation
The changed source implements the coordinate restoration and minor-ticker guard required by #549. The changed tests, corpus dependency skips, boundary handling, specification text, news fragment, development dependency, and lock files support regression coverage, optional pandas usage, or documentation of this fix. No unrelated change is demonstrated.
Full details: Docstring Coverage
Explanation
Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 11 functions across 6 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @pyproject.toml:
- Line 60: Add Matplotlib to the development dependencies alongside pandas so a
fresh make setup installs it for the plotting tests; keep it out of runtime
dependencies so it remains optional for users.
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tests/pyplot/test_boundaries.py
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…dinates
pandas' Series.plot imports matplotlib for its backend, so a dev environment
with pandas but no matplotlib failed these tests instead of skipping them.
The calendar-coordinate test now checks every converted x value, not only the
endpoints, and the news fragment describes period and business-day ordinals
separately.
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Fixes #549.
Problem
In native
xy.pyplot, pandas datetime-indexedSeries.plot()/DataFrame.plot()had two problems:ax.plot()the raw integers behind itsPeriodIndex(asi8) where 3.0 passedPeriodobjects. The shim left those integers alone, soax.get_xlim()[0]came out as15340.0instead of1325376000000.0. Business-day (freq="B") series take a separate pandas path with their own day counts and had the same problem.TimeSeries_Date*locator and formatter were stored and then called during export, raisingNotImplementedError: Derived must override. Only the major setters were guarded before.Fix (
python/xy/pyplot/_axes.py)_restore_pandas_period_timestampsconverts the integers back to timestamps. It only does this when the array shares memory with, and equals, the index pandas just recorded inax._plot_data. A later numeric overlay keeps its own units, even when its values match period numbers (e.g.[0, 1, 2]after a daily index that starts on 1970-01-01). Business-day numbers are converted withnp.busday_offsetfrom the epoch, which is pandas' own inverse. Checks are duck-typed, so the shim never imports pandas.set_minor_locator/set_minor_formatternow ignore pandas' tickers, as the major setters already did.Tests
tests/pyplot/test_pdsh_gap_features.py: daily, monthly, hourly and business-day indexes, each as a Series and a DataFrame. Each checks datetime xdata, millisecondget_xdata(orig=False)and limits, and PNG export. Also new: a numeric-overlay test and a pandas minor-ticker test. All new tests, plus the existingtest_pandas_datetime_series_plot_completes, fail before the fix.tests/pyplot/corpus/59_pandas_datetime_plot.pyreproduces the export failure before the fix. It now passes the native corpus run and the comparison against Matplotlib 3.11.REQUIREStable intest_corpus.pyskips this case where pandas or Matplotlib is missing and keeps it out of the Matplotlib-blocked boundary test.xy.pyplotitself is still asserted Matplotlib-free.pandas>=3added to thedevgroup, so CI runs this path. pandas is not a runtime dependency.uv.lockanddocs/app/uv.lockupdated.Spec / changelog
spec/matplotlib/compat.md: updated the datetime coordinates row and the corpus paragraph.news/549.bugfix.mdValidation
uv run --with pre-commit pre-commit run --all-files,ruff check,ruff format --check,ty check: passuv run pytest tests/pyplot: 1444 passedGenerated by Claude Code
Summary by CodeRabbit