TypeError while importing pythonds3 in python version 3.7.9

[sidharthism]

Upon importing pythonds3, while learning stacks as part of the course pythonds3,

# Python 3.7.9 (tags/v3.7.9:13c94747c7)

import pythonds3

The following error occured:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "./venv/lib/site-packages/pythonds3/__init__.py", line 9, in <module>
    from pythonds3.trees import (
  File "./venv/lib/site-packages/pythonds3/trees/__init__.py", line 7, in <module>
    from pythonds3.trees.binary_heap import BinaryHeap
  File "./venv/lib/site-packages/pythonds3/trees/binary_heap.py", line 13, in <module>
    class BinaryHeap:
  File "./venv/lib/site-packages/pythonds3/trees/binary_heap.py", line 52, in BinaryHeap
    def heapify(self, not_a_heap: list[Any], show_details: bool = False) -> None:
TypeError: 'type' object is not subscriptable

[sidharthism]

Most probably using primitive type list in trees/binary_heap.py", might be causing the issue.

 def heapify(self, not_a_heap: list[Any], show_details: bool = False) -> None:

[Update]

Tried using typing.List https://docs.python.org/3/library/typing.html?highlight=list#typing.List

from typing import Any, List
# ...
def heapify(self, not_a_heap: List[Any], show_details: bool = False) -> None:

Seem to fix the TypeError.

[bnmnetp]

There are no errors in 3.9 or 3.10 --- 3.7 is ancient!

I guess we should make this backward compatible or change the packaging to indicate that 3.9 is the minimum supported release.

Meanwhile -- version 3.0.3 will import successfully under older version of Python

[sidharthism]

Checked with the latest python versions. It's working fine. And thank you for the update! It seems that the issue is only with versions after 3 i.e. 3.7 till 3.8.5. Making it either backward compatible or changing the packaging to indicate that 3.9 is the minimum supported release will do I suppose.