pip install bhpq

from bhpq import BinaryHeapPriorityQueue

# The BinaryHeapPriorityQueue constructor takes two input params:

# - prefer (required param)
#    the preferred object is pushed to the top of the queue
# the prefer input is a lambda function eg:
# prefer=(lambda lhs, rhs: lhs if lhs.val >= rhs.val else rhs)

# - size
#    The initial size allocation of the queue, default value is 10

class Node(object):
def __init__(self, val):
    self.val = val

A = BinaryHeapPriorityQueue(
        prefer=(lambda lhs, rhs: lhs if lhs.val >= rhs.val else rhs), size=5
    )

A.add(Node(1))
A.add(Node(4))
A.add(Node(3))
A.add(Node(5))
A.add(Node(2))

assert 5 == A.pop().val
assert 4 == A.pop().val
assert 3 == A.pop().val
assert 2 == A.pop().val
assert 1 == A.pop().val
assert None == A.pop()