a freshly-allocated array is returned. A tuple (possible only as a
    keyword argument) must have length equal to the number of outputs.
where : array_like, optional
    This condition is broadcast over the input. At locations where the
    condition is True, the `out` array will be set to the ufunc result.
    Elsewhere, the `out` array will retain its original value.
    Note that if an uninitialized `out` array is created via the default
    ``out=None``, locations within it where the condition is False will
    remain uninitialized.
**kwargs
    For other keyword-only arguments, see the
    :ref:`ufunc docs <ufuncs.kwargs>`.
    With `x3`, test beginning at that position. With `x4`,
    stop comparing at that position.

Returns
-------
out : ndarray
    Output array of bools
    This is a scalar if both `x1` and `x2` are scalars.

See Also
--------
str.startswith