将字符串附加到python字典中的值列表中

Question

尝试学习Python。我在字典中有一个键，它的值是一个列表。是否可以将字符串附加到列表中的所有项?

value = {
"mything": ["pizza", "burger", "tacos"]
}
category = "food-"
print (value["mything"])
# prints ['pizza', 'burger', 'tacos']

我想要实现的是这样的输出:

print (value["mything"])
# prints ['food-pizza', 'food-burger', 'food-tacos']

Answer 1

由于您是新手，这里有一个简单的循环来获取您需要的内容。

for key in iter(value.keys()):
value[key] = ["food-"+ v for v in value[key]]

但是，我更喜欢这样:

value['mything'] = ['food-'+v for v in value['mything']]

Answer 2

这是一种简单的方法，部分基于您的代码:

value = {
"mything": ["pizza", "burger", "tacos"]
}
category = "food-"
results = []
for item in value["mything"]:
results.append(category + item)
print(results)

输出:

$ python3 example.py
['food-pizza', 'food-burger', 'food-tacos']

Answer 3

print(["food-"+i for i in value["mything"]])

Answer 4

可以使用列表推导式将类别附加到列表中的所有项

print ([category+food for food in value["mything"]])