Python 字典如何选择几个给定的 key，生成新的字典？

[coolair]

比如：
data= {'a': 1, 'b': 2, 'c': 3, 'd': 4}
select(data, ['a', 'b']) == {'a': 1, 'b': 2}

[ZeldaPeach]

{k: data[k] for k in ('a','b')}

[Trim21]

用字典生成式

[Sylv]

new_keys = ['a', 'b']
new_data = {key: data[key] for key in new_keys}

[shanguo]

>>> def select(src_dict, keys):
... return {k: src_dict[k] for k in keys if src_dict.get(k)}
...
>>> d = dict(name='jok', age=20)
>>> select(d, ['name'])
{'name': 'jok'}