internals.py 文件源码

def make_block(values, placement, klass=None, ndim=None, dtype=None,
               fastpath=False):
    if klass is None:
        dtype = dtype or values.dtype
        vtype = dtype.type

        if isinstance(values, SparseArray):
            klass = SparseBlock
        elif issubclass(vtype, np.floating):
            klass = FloatBlock
        elif (issubclass(vtype, np.integer) and
              issubclass(vtype, np.timedelta64)):
            klass = TimeDeltaBlock
        elif (issubclass(vtype, np.integer) and
              not issubclass(vtype, np.datetime64)):
            klass = IntBlock
        elif dtype == np.bool_:
            klass = BoolBlock
        elif issubclass(vtype, np.datetime64):
            if hasattr(values, 'tz'):
                klass = DatetimeTZBlock
            else:
                klass = DatetimeBlock
        elif is_datetimetz(values):
            klass = DatetimeTZBlock
        elif issubclass(vtype, np.complexfloating):
            klass = ComplexBlock
        elif is_categorical(values):
            klass = CategoricalBlock
        else:
            klass = ObjectBlock

    elif klass is DatetimeTZBlock and not is_datetimetz(values):
        return klass(values, ndim=ndim, fastpath=fastpath,
                     placement=placement, dtype=dtype)

    return klass(values, ndim=ndim, fastpath=fastpath, placement=placement)

# TODO: flexible with index=None and/or items=None