Code:

class PriorityQueue_MaxHeap:
    def init(self):
        self.heap = []

    def insert(self, timestamp, priority):
        heap = self.heap
        heap.append((timestamp, priority))
        self._heapify_up(len(self.heap) - 1)

Error:
heap = self.heap
^^^^^^^^^
AttributeError: ‘PriorityQueue_MaxHeap’ object has no attribute ‘heap’

Can You Help Me Please To Solve This Issue
🙂

the indentation is fine.