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Showing content from http://mail.python.org/pipermail/python-dev/attachments/20170429/084f607b/attachment.html below:

<div dir="ltr"><div><div><div>You should use List[int] (note capital first letter) and similar for other generic types. </div>Please read <a href="https://docs.python.org/3/library/typing.html">https://docs.python.org/3/library/typing.html</a> </div>The fact that this is accepted by PyCharm is a PyCharm bug, and should be reported on their tracker. -- </div>Ivan </div><div class="gmail_extra"> <div class="gmail_quote">On 29 April 2017 at 14:32, Edward Ned Harvey (python) <<a href="mailto:python@nedharvey.com" target="_blank">python@nedharvey.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div class="m_-2865256241629797566WordSection1">
Years ago, I fell in love with python and left C an C++ behind. Sometime later, I fell in love with C# because with strong typing, my IDE does most of the work for me - I never have to browse the API to find which method or attribute exists
in a class, I can use tab completion for everything, avoid type-o's, etc. So I was recently thrilled to discover type hinting in python, and support included in pycharm. I'm coming back to python now (for the last few months).
Â 
In python 3.6.1, and pycharm CE 2017.1.1 on windows (I haven't tested other versions or other platforms):
Â 
The following is recognized and supported by pycharm, but then at runtime, python throws an exception:
Â 
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â #!/usr/bin/env python3
Â 
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â def foo(bars: list[str]):
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â for bar in bars:
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â if bar.startswith("hi"):
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â raise ValueError("bar should never say hi")
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â return True
Â 
Â 
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â if foo(["a","b","c"]):
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â print("Ok")
Â 
Â 
Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â TypeError: 'type' object is not subscriptable
Â 
The problem is that python doesn't recognize list[str] as a type. Pycharm handles it, and everything works fine if I'm using a non-subscripted type, like plain old int, or str, or anything else.
Â 
Is this a bug, or is it something python simply hasn't implemented yet, or is it something that's not going to be implemented?
Â 
Is there a workaround?
</div>
</div>

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