d = {'foo': True,'bar': 42,'baz': '!'}

a = {'foo': d['foo'],'bar': d['bar']}
b = {'foo': d['foo'],'baz': d['baz']}
c = {'bar': d['bar'],'baz': d['baz']}

当然有更好的方式来表达这一点.我实际上阅读了文档,希望字典的复制方法接受要包含在新字典中的键：@H_301_5@

# I'd hoped that something like this would work...
a = d.copy('foo','bar')
b = d.copy('foo','baz')
c = d.copy('bar','baz')

我可以为此目的编写一个函数：@H_301_5@

copydict = lambda dct,*keys: {key: dct[key] for key in keys}

a = copydict(d,'foo','bar')
b = copydict(d,'baz')
c = copydict(d,'bar','baz')

有没有比上面更好的解决方案？@H_301_5@