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pandas.api.extensions.ExtensionArray._formatter — pandas 2.3.1 documentation

ExtensionArray._formatter(boxed=False)[source]#

Formatting function for scalar values.

This is used in the default ‘__repr__’. The returned formatting function receives instances of your scalar type.

Parameters:

boxedbool, default False

An indicated for whether or not your array is being printed within a Series, DataFrame, or Index (True), or just by itself (False). This may be useful if you want scalar values to appear differently within a Series versus on its own (e.g. quoted or not).

Returns:

Callable[[Any], str]

A callable that gets instances of the scalar type and returns a string. By default, repr() is used when boxed=False and str() is used when boxed=True.

Examples

>>> class MyExtensionArray(pd.arrays.NumpyExtensionArray):
...     def _formatter(self, boxed=False):
...         return lambda x: '*' + str(x) + '*' if boxed else repr(x) + '*'
>>> MyExtensionArray(np.array([1, 2, 3, 4]))
<MyExtensionArray>
[1*, 2*, 3*, 4*]
Length: 4, dtype: int64

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