def get_bone_filename(name, topping):
    """
    Return file name with extension by bone name and number of `topping` flag.
    """
    bones = {'django0': 'django.py', 'django1': 'django-toppings.py',
        'unittest0': 'unit.py', 'unittest1': 'unit-toppings.py'}
    return bones[name + str(topping)]
