How do I define a datetime field in a python dataclass? : <p>trying to get the syntax of the Python 3.7 new dataclass right.</p>

<p>if I want to include a datetime value in my dataclass,</p>

<pre><code>import datetime
from dataclasses import dataclass

@dataclass
class MyExampleWithDateTime:
    mystring: str
    myint: int
    mydatetime: ???
</code></pre>

<p>What should I write for ??? for a datetime field?</p>
