How to override Python's random with own generator?

In the docs for Python's random, it states that one can "use a basic generator of your own" by overriding the random() method. Suppose I have a custom generator that outputs a random float uniformly in the semi-open range [0.0, 1.0), i.e. just like random().

• How would I go about replacing Python's with my own?

Further, suppose the replacement is a true random generator built off of a natural source of entropy.

• Does this mean I can use the other parts of the class like random.choice() on a given array and make claims that the chosen element is truly random?