背景

For example, instead of writing mydict[‘val’], I’d like to write mydict.val.

解决方案

基础版

I’ve always kept this around in a util file. You can use it as a mixin on your own classes too.

class dotdict(dict):
    """dot.notation access to dictionary attributes"""
    __getattr__ = dict.get
    __setattr__ = dict.__setitem__
    __delattr__ = dict.__delitem__

mydict = {'val':'it works'}
nested_dict = {'val':'nested works too'}
mydict = dotdict(mydict)
print(mydict.val)
# 'it works'

mydict.nested = dotdict(nested_dict)
print(mydict.nested.val)
# 'nested works too'

这个时候嵌套字典行不行呢？也就是字典里的某一个值又是一个字典，不行！！！！！！

dict1={'val':'it works'}
yourdict={'high':dict1}
yourdict=dotdict(yourdict)
print(yourdict.high.val)

升级版

class DotDict(dict): 
    """dot.notation access to dictionary attributes""" 
    def __getattr__(*args):
        val = dict.get(*args) 
        return DotDict(val) if type(val) is dict else val      
    __setattr__ = dict.__setitem__     
    __delattr__ = dict.__delitem__ 

下面就成功了。

dict1={'val':'it works'}
yourdict={'high':dict1}
yourdict=DotDict(yourdict)
print(yourdict.high.val)
#it works