Laboratoire de l'Informatique et du Parallélisme » Pobyso

    We consider 3 kinds of polynomials:

    - symbolicExpressions that are polynomials;

    - callable symbolicExpression that are polynomials;

    - polynomials over a ring.

    # We consider a constant as a polynomial. All 3 kinds of polynomials

    # have the is_constant() method.

        if objectSa.is_constant():

            return True

    except AttributeError:

        return False

    # All 3 kinds of polynomials have the args() method.

    # A polynomial has at least one argument.

    # We catch the TypeError in case the return value of args() has

    # no __getitem__ method.

    try:

        argument = objectSa.args()[0]

    except (AttributeError, TypeError):

        return False

    # The 2 first kinds have a is_polynomial() method that returns True

    try:

        if not objectSa.is_polynomial(argument):

        try:

            objectSa.polynomial(argument)

        except AttributeError:

            return False