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Add cast #338

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merged 2 commits into from
Dec 8, 2023
Merged

Add cast #338

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f0e97ba
add cast
MarcoGorelli Dec 7, 2023
ebaeb67
note what may vary across implementations
MarcoGorelli Dec 8, 2023
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10 changes: 10 additions & 0 deletions spec/API_specification/dataframe_api/column_object.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1057,3 +1057,13 @@ def persist(self) -> Self:
at most once per dataframe, and as late as possible in the pipeline.
"""
...

def cast(self, dtype: DType) -> Self:
"""Cast specified columns to specified dtypes.

The following is not specified and may vary across implementations:

- Cross-kind casting (e.g. integer to string, or to float)
- Behaviour in the case of overflows
"""
...
10 changes: 10 additions & 0 deletions spec/API_specification/dataframe_api/dataframe_object.py
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Original file line number Diff line number Diff line change
Expand Up @@ -925,3 +925,13 @@ def persist(self) -> Self:
features.append(column_name)
"""
...

def cast(self, dtypes: Mapping[str, DType]) -> Self:
"""Convert specified columns to specified dtypes.

The following is not specified and may vary across implementations:

- Cross-kind casting (e.g. integer to string, or to float)
- Behaviour in the case of overflows
"""
...