如何使用format（）格式化字典键和值

Question

这里是Python新手，使用python2.7。我正在创建一个程序，打印出一份随机的食谱，里面有配料和说明。我会在最后公布我的代码。我得到的输出是：

Here is a recipe('Sushi', ['tuna', 'rice', 'mayonnaise', 'wasabi'])

1. Wash off the tuna

但我想要这个：

Here is a recipe: Sushi: tuna, rice, mayonnaise, wasabi

1. Wash off the tuna

我可以使用format（）方法来完成类似的任务吗？在

这是我的代码：

import random

def random_recipe():
    recipe_dict = {'ChocolateCake':['flour', 'eggs', 'chocolate', 'oil', 'frosting'],
                   'Pasta':['noodles', 'marinara','onions'],
                   'Sushi':['tuna','rice','mayonnaise','wasabi']}


    print "Here is a recipe" + str(random.choice(list(recipe_dict.items())))

    if recipe_dict.keys() == 'ChocolateCake':
        print "1. Mix the flour with the eggs"
    elif recipe_dict.keys() == 'Pasta':
        print "1. Boil some water"
    else:
        print "1. Wash off the tuna"

Answer 1

您可以使用join()来连接dict的值，如下例所示：

from random import choice

recipe_dict = {'ChocolateCake':['flour', 'eggs', 'chocolate', 'oil', 'frosting'],
                   'Pasta':['noodles', 'marinara','onions'],
                   'Sushi':['tuna','rice','mayonnaise','wasabi']}

# Or you can unpack your data:
# key, val = choice(recipe_dict.items())
keys = list(recipe_dict.keys())
random_key = choice(keys)
# Using str.format()
print "Here is a recipe: {}: {}".format(random_key, ', '.join(recipe_dict[random_key]))

if random_key == 'ChocolateCake':
    print "1. Mix the flour with the eggs"
elif random_key == 'Pasta':
    print "1. Boil some water"
else:
    print "1. Wash off the tuna"

Answer 2

由于您是从random中检索元组，请查找下面的工作代码

import random

recipe_dict = {'ChocolateCake':['flour', 'eggs', 'chocolate', 'oil', 'frosting'],
               'Pasta':['noodles', 'marinara','onions'],
               'Sushi':['tuna','rice','mayonnaise','wasabi']}


ra_item = random.choice(list(recipe_dict.items()))
print  "Here is a recipe {}:{}".format(ra_item[0],','.join(ra_item[1]))

if recipe_dict.keys() == 'ChocolateCake':
    print "1. Mix the flour with the eggs"
elif recipe_dict.keys() == 'Pasta':
    print "1. Boil some water"
else:
    print "1. Wash off the tuna"

您将使用此代码获得预期的输出。在

Answer 3

在下面的代码中将a替换为recipe_dict：

for k, v in a.items():
    print( k + ': ' + ','.join(map(str, v)))