Is class attribute shared between threads in Python?

sharing.py

import threading


class SharingChecker:
    number: int = 0

    def increment(self) -> None:
        SharingChecker.number += 1


def task() -> None:
    s = SharingChecker()
    s.increment()
    print(s.number)

pcs = []
for thread in range(5):
    pcs.append(threading.Thread(target=task))

for thread in pcs:
    thread.start()
    thread.join()
    
"""
Is class attribute shared between threads in Python?

output:
1
2
3
4
5

Conclusion: Yes, it is.
"""