ExtensionArray.
_formatter
Formatting function for scalar values.
This is used in the default ‘__repr__’. The returned formatting function receives instances of your scalar type.
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).
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.
repr()
boxed=False
str()
boxed=True