理解pandas.DataFrame.reindex

reindex

DataFrame.reindex(self, labels=None, index=None, columns=None, axis=None, method=None, copy=True, level=None, fill_value=nan, limit=None, tolerance=None)

Conform DataFrame to new index with optional filling logic.

Parameters

Parameterstypemeaninglabelsarray-likeNew labels/index to conform the axis specified by “axis” toindex, columnsarray-likeaxisint or strAxis to target, (‘index’, ‘columns’) (0,1)method{None, ‘backfill’/‘bfill’, ‘pad’/‘ffill’, ‘nearest’}copyboollevelint or namefill_valuescalar, default np.NaNlimitint, default Nonetoleranceoptional

References

API referenceEssential basic functionality : Reindexing and altering labelsGeeksforGeeks