@register.filter
def quantity_ordered(product, order):
    try:
        return order.items.values('quantity').get(product=product)['quantity']
    except ObjectDoesNotExist:
        return 0
Solve system of linear equations.
dataset/ETHPy150Open matthiask/plata/plata/shop/templatetags/plata_tags.py/quantity_ordered--crossover with--dataset/ETHPy150Open lebedov/scikit-cuda/skcuda/magma.py/magma_zgesv_nopiv_gpu