<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def contains_all(self, other):
 """Return ``True`` if ``other`` is a sequence of complex numbers."""

        dtype = getattr(other, 'dtype', None)
        if dtype is None:
            dtype = np.result_type(*other)
        return is_numeric_dtype(dtype)