Julián Perelli    Projects    Blog    Talks

The most useful python class of all time

If you work with javascript and python, you probably hate that the dicts in python are not accesible by dot-notation dict.prop, well you can fix that python bug easily by using the next class

class Bunch(dict):
    """Util class to have a hashable dictionary accesible by dot-notation."""

    __getattr__ = dict.get
    __setattr__ = dict.__setitem__

    def __hash__(self):
        return hash(tuple(sorted(self.items())))

You can use it like this

dic = {
    'pepe': 1,
    'foo': 'dsa',
    'bar': 2.0,
}
obj = Bunch(dic)
print(obj.pepe)
>>> 1

or (the same)

obj = Bunch({
    'pepe': 1,
    'foo': 'dsa',
    'bar': 2.0,
})
print(obj.pepe)
> 1

and by being hashable, you can even use it together with @lru_cache

from functools import lru_cache

@lru_cache()
def inc_pepe(dic):
    print(dic.pepe)
    return dic.pepe + 1

obj = Bunch({
    'pepe': 1,
    'foo': 'dsa',
    'bar': 2.0,
})

print(inc_pepe(obj))
> 1
> 2
print(inc_pepe(obj))
> 2

Disclaimer: I might have exaggerated with the title for clickbait purposes.