```mermaid
gantt
title Python Language Changes Over time
dateFormat YYYY-MM
axisFormat %Y
section 3.3
yield from :2012-09,2014-03
section 3.4
section 3.5
async and await :2015-09,2016-12
section 3.6
f-strings :crit, 2016-12, 2018-06
variable annotations :2016-12, 2018-06
async comprehensions :2016-12, 2018-06
section 3.7
async/await as keywords :2018-06, 2019-10
section 3.8
walrus :2019-10, 2020-10
positional-only arguments :2019-10, 2020-10
small f-string, finally changes :2019-10, 2020-10
section 3.9
more flexible decorators :2020-10, 2021-10
section 3.10
pattern matching :crit, 2021-10, 2022-10
(context managers) :2021-10, 2022-10
section 3.11
exception groups :2022-10, 2023-10
variadic generics :2022-10, 2023-10
```