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}