ENH: add dtype_from_format option to preserve Excel text formatting #63037
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rhshadrach
requested changes
Nov 11, 2025
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Thanks for the PR. Overall, this seems far too complex an implementation for the feature being implemented. Why can we not just determine the format upon reading each cell and react appropriately?
In addition, it does not seem to me pandas should ever read a cell as numeric if that cell is text. I think we should not implement this as a flag.
| ordered_levels.append(level_idx) | ||
| return ordered_levels | ||
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| def _convert_index_labels(self, index, levels_to_convert: list[int]): |
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It looks like code got duplicated?
| ordered_levels.append(level_idx) | ||
| return ordered_levels | ||
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| def _convert_index_labels(self, index, levels_to_convert: list[int]): |
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| This behavior currently applies to the ``openpyxl`` and ``xlrd`` engines. Other | ||
| engines simply ignore the flag until text format detection is implemented for | ||
| them. |
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I'm negative on diverging behavior between readers unless absolutely necessary.
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| @staticmethod | ||
| def _parser_engine(parser): | ||
| return getattr(parser, "_engine", parser) | ||
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| @classmethod | ||
| def _parser_attr(cls, parser, attribute: str): | ||
| if hasattr(parser, attribute): | ||
| return getattr(parser, attribute) | ||
| engine = cls._parser_engine(parser) | ||
| if engine is not parser and hasattr(engine, attribute): | ||
| return getattr(engine, attribute) | ||
| return None |
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| @staticmethod | ||
| def _cell_is_text_formatted(cell) -> bool: | ||
| number_format = getattr(cell, "number_format", None) |
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When does cell have and not have the number_format attribute?
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.