arg : list, tuple, 1-d array, or Series
errors : {‘ignore’, ‘raise’, ‘coerce’}, default ‘raise’
- If ‘raise’, then invalid parsing will raise an exception
- If ‘coerce’, then invalid parsing will be set as NaN
- If ‘ignore’, then invalid parsing will return the input
downcast : {‘integer’, ‘signed’, ‘unsigned’, ‘float’} , default None
If not None, and if the data has been successfully cast to a numerical dtype (or if the data was numeric to begin with), downcast that resulting data to the smallest numerical dtype possible according to the following rules:
- ‘integer’ or ‘signed’: smallest signed int dtype (min.: np.int8)
- ‘unsigned’: smallest unsigned int dtype (min.: np.uint8)
- ‘float’: smallest float dtype (min.: np.float32)
As this behaviour is separate from the core conversion to numeric values, any errors raised during the downcasting will be surfaced regardless of the value of the ‘errors’ input.
In addition, downcasting will only occur if the size of the resulting data’s dtype is strictly larger than the dtype it is to be cast to, so if none of the dtypes checked satisfy that specification, no downcasting will be performed on the data.
New in version 0.19.0.
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