minimal.py

minimal.py

# Instructions
# 1. Load this file in IPython
# 2. call `run()`
# 3. Interrupt it with Ctrl+C
# 4. See no global state changed

from typing import Any,Optional
from time import sleep

class Model:
  state:Any

def train(m:Model)->None:
  m.state = 0
  print('Hit Ctrl+C to interrupt "training". Check out (the absence of) M.state')
  while True:
    m.state = m.state + 1
    print('.', end='', flush=True)
    sleep(1)

M:Optional[Model]=None

def run():
  global M
  M=Model()
  train(M)