如何附加到 Python 字典而不是更新

Question

我想附加到字典中，例如a={1:2}a.update({2:4})a.update({1,3})I would like this to give a ={1: (2,3), 2: 4}如何才能做到这一点？没有追加。更新将其覆盖为 {1: 3, 2: 4}

Answer 1

你可以尝试这样的事情：

a = {1:2}

updates = [{2:4},{1:3}]

for dct in updates:

    for key in dct:

        if key in a:

            a[key] = (a[key], dct[key])

        else:

            a[key] = (dct[key])

print(a)

#Gives: {1: (2, 3), 2: 4}