Andrew Svetlov <andrew.svet...@gmail.com> added the comment: 1. asyncio is not supported by 2.7 anyway 2. with (yield from lock) is based on very non-obvious tricks: a) lock.__enter__ is forbidden and raises RuntimeError b) actually lock.__iter__ is called for lock acquiring *before* calling `with` c) the object returned from __iter__ is a context manager with __enter__/__exit__ methods 3. asyncio is converted to async/await syntax by https://bugs.python.org/issue32193 (old `yield from` style is fully supported still). 4. the deprecation was proposed by Yury Selivanov in https://github.com/python/cpython/pull/4753#discussion_r155658200
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