如何从数组中的值迭代字典并存储在新字典中

时间:2019-05-01 17:51:44

标签: python loops dictionary store key-value

我有一个数组(Arr []),对于数组中的每个项目,我都希望它通过字典(specs {})并计算相应的值并将其存储在新字典中,但是请确定如何为这个新字典指定键和值{结果{})。

Arr=["saucer", "shoes"]
def calc(Arr, context, user_results):
    results = {}
    for x in Arr:
        if x == specs.keys():
            results = specs.values
            results.append(x : results)
    return results

specs = {'cup': 3,'saucer': 5, 'bag': 17, 'shoes': 9}

results = {“ saucer”:5,“ shoes”:9}

5 个答案:

答案 0 :(得分:4)

您可以使用dict中的项目使用dict理解来构建新的specs

results = {key: specs[key] for key in Arr if key in specs}

答案 1 :(得分:1)

In [9]: specs = {'cup': 3,'saucer': 5, 'bag': 17, 'shoes': 9}

In [10]: Arr=["saucer", "shoes"]

In [11]: R = {k: v for k, v in specs.items() if k in Arr}

In [12]: R
Out[12]: {'saucer': 5, 'shoes': 9}

答案 2 :(得分:0)

输入:

Arr=["saucer", "shoes"]
specs = {'cup': 3,'saucer': 5, 'bag': 17, 'shoes': 9}

代码1:

results = {item: specs.get(item, None) for item in Arr if item in specs}

代码2:

results = {key: value for key, value in specs.items() if key in Arr}

结果:

{'saucer': 5, 'shoes': 9}

答案 3 :(得分:0)

只需检查列表并创建另一个字典

specs = {'cup': 3,'saucer': 5, 'bag': 17, 'shoes': 9}

Arr= ["saucer", "shoes"]

em={}

for item in Arr:
    if item in specs:
        em[item] = specs[item]
print(em)

{'saucer': 5, 'shoes': 9}  

答案 4 :(得分:0)

您可以使用函数itemgetter从字典中获取值,并使用zip arr列表中的值来构建新字典:

from operator import itemgetter

arr = ["saucer", "shoes"]

specs = {'cup': 3, 'saucer': 5, 'bag': 17, 'shoes': 9}

dict(zip(arr, itemgetter(*arr)(specs)))
# {'saucer': 5, 'shoes': 9}