create a js-like object in python

jsobject.py

# A JS-like object in Python is an object whose properties can be set on-the-fly as in
# JS (i.e., without the need to define a class first).

def JSObject(data={}):
    class JSObject:
        def __getattr__(self, name):
            return data[name]

        def __setattr__(self, name, value):
            data[name] = value

    return JSObject()

person = JSObject()
person.name = "Alice"
person.age = 40
person.say_hi = lambda: "Hi! My name is {}!".format(person.name)

print(person.name)      # Alice
print(person.age)       # 40
print(person.say_hi())  # Hi! My name is Alice!