human
Complete the below
def _makeOperator(operatorInput, expectedShape):

    ''''Takes a dense numpy array or a sparse matrix or
    a function and makes an operator performing matrix * blockvector
    products.
    Examples
    >>> A = _makeOperator( arrayA, (n, n) )
    >>> vectorB = A( vectorX )'
    '''
 ... What is a the Python program you requested?
assistant
#Here is the Python program you requested.
    if (operatorInput is None):
        def ident(x):
            return x
        operator = LinearOperator(expectedShape, ident, matmat=ident)
    else:
        operator = aslinearoperator(operatorInput)
    if (operator.shape != expectedShape):
        raise ValueError('operator    has    invalid    shape')
    return operator