一个关于字典的函数

def cakes(recipe, available):
    d = [False for recipe_key in recipe.keys() if recipe_key not in available.keys()]
    if d:
       return 0
    else:
       return min([available[recipe_key]/recipe[recipe_key] for recipe_key in recipe.keys()])

def cakes(recipe, available):
  return min(available.get(k, 0)/recipe[k] for k in recipe)