fix: python closure is weird

[xgui3783]

fix closure bug

see a simplified reproduction:

from concurrent.futures import ThreadPoolExecutor
from functools import partial

def call_fn(fn):
    fn()

def main():
    arr = []
    for i in range(10):
        def fn(j):
            print(j)
        arr.append(
            partial(fn, i)
        )

    with ThreadPoolExecutor(4) as ex:
        list(ex.map(
            call_fn,
            arr
        ))

def faulty():

    arr = []
    for i in range(10):
        def fn():
            print(i)
        arr.append(fn)

    with ThreadPoolExecutor(4) as ex:
        list(ex.map(
            call_fn,
            arr
        ))

if __name__ == "__main__":
    print("faulty")
    faulty()
    print("main")
    main()

prints

faulty
9
9
9
9
9
9
9
9
9
9
main
0
1
3
4
5
2
9
7
8
6