```
Traceback (most recent call last):
  File "E:/Aisitaisi/All_about_Contest/raw.py", line 1, in <module>
    from interruptingcow import timeout
  File "C:\Users\hp\AppData\Local\Programs\Python\Python35\lib\site-packages\interruptingcow\__init__.py", line 5, in <module>
    from contextlib import GeneratorContextManager
ImportError: cannot import name 'GeneratorContextManager'

```

---

```
from interruptingcow import timeout
import time
@timeout(.5)
def foo():
    with timeout(.3):
        # some expensive operation
        pass``

```