I need the code for interval_and(self, other), interval_contains(self, x), and interval_sub(self, other) with the correct parameters used. It must pass the tests assigned for each code.

def interval_and(self, other):

"""Intersection; returns an interval, or None."""

### YOUR CODE HERE

Interval.__and__ = interval_and

def interval_contains(self, x):

### YOUR CODE HERE

Interval.__contains__ = interval_contains

def interval_sub(self, other):

"""Subtracts from this interval the interval other, returning a possibly

empty list of intervals."""

### YOUR CODE HERE

Interval.__sub__ = interval_sub

1 class Interval(object): 4 5 _init__(self, x0, x1): # Sorts the endpoints, to ensure that xo