JavaScript-like Object in Python standard library?

You can try with attrdict:

class attrdict(dict):
    def __init__(self, *args, **kwargs):
        dict.__init__(self, *args, **kwargs)
        self.__dict__ = self

a = attrdict(x=1, y=2)
print a.x, a.y
print a['x'], a['y']

b = attrdict()
b.x, b.y  = 1, 2
print b.x, b.y
print b['x'], b['y']

In Python 3.3+ you can use SimpleNamespace, which does exactly what you're looking for:

from types import SimpleNamespace
obj = SimpleNamespace()
obj.airspeed = 42

https://docs.python.org/3.4/library/types.html#types.SimpleNamespace

There is no "standard library" with that kind of object, but on ActiveState there is a quite well-known recipe from Alex Martelli, called "bunch".

Note: there's also a package available on pypi called bunch and that should do about the same thing, but I do not know anything about its implementation and quality.