@classmethod<EOL><INDENT>def _from_sequence(cls, scalars, dtype=None, copy=False):<DEDENT>
raise AbstractMethodError(cls)<EOL>
Construct a new ExtensionArray from a sequence of scalars.

Parameters
----------
scalars : Sequence
    Each element will be an instance of the scalar type for this
    array, ``cls.dtype.type``.
dtype : dtype, optional
    Construct for this particular dtype. This should be a Dtype
    compatible with the ExtensionArray.
copy : boolean, default False
    If True, copy the underlying data.

Returns
-------
ExtensionArray