python-contextvars

来源： https://stackoverflow.com/questions/63105799/understanding-python-contextvars

问题 I'm working on a Django project which requires Python3.7.3 virtual environment on Ubuntu 16 . So I created a virtual environment and installed all the requirements in it and verified it, activated it. But when I try to run the Django server using runserver it is giving me below error. Traceback (most recent call last): File "/usr/lib/python3.7/decimal.py", line 3, in <module> from _decimal import * ModuleNotFoundError: No module named '_decimal' During handling of the above exception, another

问题 I am completely newb on asyncio and ContextVars , I just read up what's new in 3.7 and discovered ContextVars , I struggle to understand it's usage, all I know it's helpful in coroutines, instead of using thread.local should use ContextVars . But none of the official doc and top google search result could help me truely understand its purpose. So is convextvars shared across modules? I tried: example.py from contextvars import ContextVar number = ContextVar('number', default=100) number.set(1