(f, u, K, front=False)
return dmp_from_dict(h, w, K.dom), w
Convert ``f`` from ``K[X][Y]`` to ``K[X,Y]``.

    Examples
    ========

    >>> from sympy.polys.rings import ring
    >>> from sympy.polys.domains import ZZ
    >>> from sympy.polys.densebasic import dmp_inject

    >>> R, x,y = ring("x,y", ZZ)

    >>> dmp_inject([R(1), x + 2], 0, R.to_domain())
    ([[[1]], [[1], [2]]], 2)
    >>> dmp_inject([R(1), x + 2], 0, R.to_domain(), front=True)
    ([[[1]], [[1, 2]]], 2)
Convert ``f`` from ``K[X][Y]`` to ``K[X,Y]``.
Convert f from K [ X ] [ Y ] to K [ X Y ] .
def dmp_inject(f, u, K, front=False):
    """
    Convert ``f`` from ``K[X][Y]`` to ``K[X,Y]``.

    Examples
    ========

    >>> from sympy.polys.rings import ring
    >>> from sympy.polys.domains import ZZ
    >>> from sympy.polys.densebasic import dmp_inject

    >>> R, x,y = ring("x,y", ZZ)

    >>> dmp_inject([R(1), x + 2], 0, R.to_domain())
    ([[[1]], [[1], [2]]], 2)
    >>> dmp_inject([R(1), x + 2], 0, R.to_domain(), front=True)
    ([[[1]], [[1, 2]]], 2)

    """
    f, h = dmp_to_dict(f, u), {}

    v = K.ngens - 1

    for f_monom, g in f.items():
        g = g.to_dict()

        for g_monom, c in g.items():
            if front:
                h[g_monom + f_monom] = c
            else:
                h[f_monom + g_monom] = c

    w = u + v + 1

    return dmp_from_dict(h, w, K.dom), w
def dmp_inject ( f , u , K , front = False ) : f , h = dmp_to_dict ( f , u ) , { } v = K . ngens - 1 for f_monom , g in f . items ( ) : g = g . to_dict ( ) for g_monom , c in g . items ( ) : if front : h [ g_monom + f_monom ] = c else : h [ f_monom + g_monom ] = c w = u + v + 1 return dmp_from_dict ( h , w , K . dom ) , w