How to write to an existing excel file without breaking formulas with openpyxl?

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Openpyxl 1.7 contains several improvements for handling formulae so that they are preserved when reading. Use guess_types=False to prevent openpyxl from trying to guess the type for a cell and 1.8 includes the data_only=True option if you want the values but not the formula.

Want to preserve charts in the 2.x series.

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