(self, mc)
return self
add to self the monomial coeff*x0**i0*x1**i1*...
        unless self is a generator -- then just return the sum of the two.

        mc is a tuple, (monom, coeff), where monomial is (i0, i1, ...)

        Examples
        --------
        >>> from sympy.polys.rings import ring
        >>> from sympy.polys.domains import ZZ

        >>> _, x, y = ring('x, y', ZZ)
        >>> p = x**4 + 2*y
        >>> m = (1, 2)
        >>> p1 = p._iadd_monom((m, 5))
        >>> p1
        x**4 + 5*x*y**2 + 2*y
        >>> p1 is p
        True
        >>> p = x
        >>> p1 = p._iadd_monom((m, 5))
        >>> p1
        5*x*y**2 + x
        >>> p1 is p
        False
add to self the monomial coeff*x0**i0*x1**i1*...
        unless self is a generator -- then just return the sum of the two.
add to self the monomial coeff * x0 ** i0 * x1 ** i1 * ... unless self is a generator -- then just return the sum of the two .
def _iadd_monom(self, mc):
        """add to self the monomial coeff*x0**i0*x1**i1*...
        unless self is a generator -- then just return the sum of the two.

        mc is a tuple, (monom, coeff), where monomial is (i0, i1, ...)

        Examples
        --------
        >>> from sympy.polys.rings import ring
        >>> from sympy.polys.domains import ZZ

        >>> _, x, y = ring('x, y', ZZ)
        >>> p = x**4 + 2*y
        >>> m = (1, 2)
        >>> p1 = p._iadd_monom((m, 5))
        >>> p1
        x**4 + 5*x*y**2 + 2*y
        >>> p1 is p
        True
        >>> p = x
        >>> p1 = p._iadd_monom((m, 5))
        >>> p1
        5*x*y**2 + x
        >>> p1 is p
        False

        """
        if self in self.ring._gens_set:
            self = self.copy()
        expv, coeff = mc
        c = self.get(expv)
        if c is None:
            self[expv] = coeff
        else:
            c += coeff
            if c:
                self[expv] = c
            else:
                del self[expv]
        return self
def _iadd_monom ( self , mc ) : if self in self . ring . _gens_set : self = self . copy ( ) expv , coeff = mc c = self . get ( expv ) if c is None : self [ expv ] = coeff else : c += coeff if c : self [ expv ] = c else : del self [ expv ] return self