Dive into Python 5.5

[james_027]

Hi,

class UserDict:
    def __init__(self, dict=None):
        self.data = {}
        if dict is not None: self.update(dict)

I just don't understant this code, as it is not also mention in the
book. the update is a method of a dict right? in my understanding the
last statement should be self.data.update(dict).

someone please explain to me what happen where?

Thanks
james