Python - 将两个词典合并为一个列表（按键）

Question

I have:

market = {
       "APPL" : 2.33 },
        "IBM" : 3.44 },
        "AMZN" : 5.33 }
}

portfolio = {
        "APPL" : 0.20,
        "IBM" : 0.05
}

I want to merge the above dictionaries into a single list, that has the following structure. It uses common keys to do the multiplication:

index 0:  Multiplication of 2.33 and 0.20
index 1:  Multiplication of 3.44 and 0.05

Any ideas?

Answer 1

You could iterate through the items of portfolio like this:

[value * market[key] for key, value in portfolio.items()]

or, if you wanted to keep the keys:

{key: value * market[key] for key, value in portfolio.items()}

Edit: I missed that you wanted a list, not a dict

Answer 2

您可以使用列表推导来迭代portfolio的键并输出相应值的产品：

[market[k] * v for k, v in portfolio.items()]

Answer 3

You could use a list comprehension:

market = {
       "APPL" : 2.33,
        "IBM" : 3.44,
        "AMZN" : 5.33 }

portfolio = {
        "APPL" : 0.20,
        "IBM" : 0.05
}

out = [value * market[key] for key, value in portfolio.items()]
print(out)

# [0.466, 0.17200000000000001]

Note, though, that dicts are only ordered since Python 3.6, so the order of the values in the list are only guaranteed to match the order of the items in the portfolio dict with these versions.