Python 3.5: "async with" results in SyntaxError. Why? : <p>I am using Python 3.5, which, according to <a href="https://www.python.org/dev/peps/pep-0492/" rel="noreferrer">PEP 492</a> should have access to the <code>async with</code> syntax, yet I get a SyntaxError when I try to use it. What am I doing wrong?</p>

<pre><code>In [14]: sys.version
Out[14]: '3.5.2 (default, Oct 11 2016, 04:59:56) \n[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.38)]'

In [15]: async with aiohttp.ClientSession() as session:
  File "&lt;ipython-input-15-9799c5ce74cf&gt;", line 1
    async with aiohttp.ClientSession() as session:
             ^
SyntaxError: invalid syntax
</code></pre>
