dataframe

Fix Misordered Categories in plotnine Bar Charts after polars Unpivot: Set Discrete Axis Order

Oct. 18, 17:00

Vectorized Binary Indicator Matrix in Pandas DataFrames: Reshape, One-Hot Encode, Groupby, Transpose

Oct. 18, 12:00

Build Filled, Stacked X–Y Charts in Jupyter with Matplotlib: Draw Rectangles from min/max Bounds

Oct. 17, 12:00

Pandas pivot_table Subtotals with MultiIndex: Modern groupby+concat Approach (No pd.append)

Oct. 16, 14:00

Pandas DataFrame: Normalize and Sort Semicolon-Delimited String Tokens by Handling Whitespace

Oct. 16, 13:00

Fix pandas yfinance MultiIndex column misalignment: resolve ValueError in Series comparisons

Oct. 16, 12:00

Selenium Pagination Fix: Scrape Vale Dividends Table in Python by Iterating with Next Button

Oct. 8, 03:00

Polars crosstab to percentages: fix generator-in-select TypeError with native expressions

Oct. 6, 23:00

pandas MultiIndex: Assign a per-day maximum to a single 08:30 row using mask, groupby, transform

Oct. 4, 11:00

Plotly line chart looks wrong after updates? Fix yfinance MultiIndex changes in Jupyter

Oct. 3, 05:00

Pandas pivot_table includes unused categories: how to fix ghost columns with observed=True

Oct. 2, 11:00

Polars DataFrame: How to Drop the First Column with Selectors (sx.by_index) and Stop exclude Errors

Oct. 1, 13:00

Pandas lexicographic group sorting: aggregate to tuples, sort, and explode for tie-aware order

Sep. 30, 23:00

Sorting Column Maxima in Pandas: Series vs DataFrame, sort_values vs sort_index Explained

Sep. 27, 05:00

Plot Regime Candlesticks and Volume Profiles on One Continuous Canvas with Matplotlib GridSpec

Sep. 26, 17:00

Polars: Center a Column and Get the Scalar Mean in a Single Expression Plan with Implode

Sep. 25, 07:00

Polars group_by().agg() with head(n): Preserving Row Alignment Across Multiple Columns

Sep. 23, 01:00

Pandas/NumPy: Normalize DataFrame decimals to end with .5 (floor + 0.5), not rounding

Sep. 22, 23:00

Pandas groupby: filter grouped data by original index, keep rows, and count surviving groups

Sep. 22, 17:00

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