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Couldn't figure out how to use await from python 3.5-rc2
>>> async def foo(): ... pass ... >>> await foo() File "<ipython-input-10-a18cb57f9337>", line 1 await foo() ^ SyntaxError: invalid syntax >>> c = foo() >>> await c File "<ipython-input-12-cfb6bb0723be>", line 1 await c ^ SyntaxError: invalid syntax >>> import sys >>> sys.version '3.5.0rc2 (default, Aug 26 2015, 21:54:21) \n[GCC 5.2.0]' >>> del c RuntimeWarning: coroutine 'foo' was never awaited >>> 
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Inside an async function, you can use the await keyword before a call to a function that returns a promise. This makes the code wait at that point until the promise is settled, at which point the fulfilled value of the promise is treated as a return value, or the rejected value is thrown.
The await expression causes async function execution to pause until a Promise is settled (that is, fulfilled or rejected), and to resume execution of the async function after fulfillment. When resumed, the value of the await expression is that of the fulfilled Promise .
await can be used on its own with JavaScript modules. Note: The purpose of async / await is to simplify the syntax necessary to consume promise-based APIs. The behavior of async / await is similar to combining generators and promises. Async functions always return a promise.
As per documentation, await can only be used inside a coroutine function. So the correct syntax for using it should be
async def foo(): pass async def bar(): await foo() Just like in C#, await can only be used in an async method (function).
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