feature #49580: support new-style float_format string in to_csv #61650
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feat(to_csv): support new-style float_format strings using str.format
Detect and process new-style format strings (e.g., "{:,.2f}") in the
float_format parameter of to_csv.
- Check if float_format is a string and matches new-style pattern
- Convert it to a callable (e.g., lambda x: float_format.format(x))
- Ensure compatibility with NaN values and mixed data types
- Improves formatting output for floats when exporting to CSV
Example:
df = pd.DataFrame([1234.56789, 9876.54321])
df.to_csv(float_format="{:,.2f}") # now outputs formatted values like
1,234.57
Co-authored-by: Pedro Santos <pedro.filipe.santos@tecnico.ulisboa.pt>
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@simonjayhawkins Hi! Just wanted to check if this PR needs anything else from my side. Thanks in advance for reviewing |
mroeschke
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Jun 30, 2025
mroeschke
reviewed
Jun 30, 2025
mroeschke
reviewed
Jun 30, 2025
mroeschke
reviewed
Jun 30, 2025
|
Could you add a whatsnew entry in |
Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
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@mroeschke What do you think of the updates? |
…_produces_warning
| @@ -84,6 +84,7 @@ Other enhancements | |||
| - Support passing a :class:`Iterable[Hashable]` input to :meth:`DataFrame.drop_duplicates` (:issue:`59237`) | |||
| - Support reading Stata 102-format (Stata 1) dta files (:issue:`58978`) | |||
| - Support reading Stata 110-format (Stata 7) dta files (:issue:`47176`) | |||
| - :meth:`DataFrame.to_csv` and :meth:`Series.to_csv` now support Python's new-style format strings (e.g., ``"{:.6f}"``) for the ``float_format`` parameter, in addition to old-style ``%`` format strings and callables. This allows for more flexible and modern formatting of floating point numbers when exporting to CSV. (:issue:`49580`, :issue:`61650`) | |||
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| - :meth:`DataFrame.to_csv` and :meth:`Series.to_csv` now support Python's new-style format strings (e.g., ``"{:.6f}"``) for the ``float_format`` parameter, in addition to old-style ``%`` format strings and callables. This allows for more flexible and modern formatting of floating point numbers when exporting to CSV. (:issue:`49580`, :issue:`61650`) | |
| - :meth:`DataFrame.to_csv` and :meth:`Series.to_csv` now support Python's new-style format strings (e.g., ``"{:.6f}"``) for the ``float_format`` parameter, in addition to old-style ``%`` format strings and callables. This allows for more flexible and modern formatting of floating point numbers when exporting to CSV. (:issue:`49580`) |
Probably only needs reference to the issue. Was there a specific reason to reference this PR?
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feat(to_csv): support new-style float_format strings using str.format
Detect and process new-style format strings (e.g., "{:,.2f}") in the float_format parameter of to_csv.
Example:
df = pd.DataFrame([1234.56789, 9876.54321])
df.to_csv(float_format="{:,.2f}") # now outputs formatted values like 1,234.57 and support new-style without .format
doc/source/whatsnew/v3.0.0.rstfile if fixing a bug or adding a new feature.