<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 7, 2017 at 2:58 AM, Guido van Rossum <span dir="ltr"><<a href="mailto:guido@python.org" target="_blank">guido@python.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><span class="gmail-">On Mon, Nov 6, 2017 at 2:34 AM, Stéfane Fermigier <span dir="ltr"><<a href="mailto:sf@fermigier.com" target="_blank">sf@fermigier.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>4) 10 years ago, when I was working on the EDOS project ( <a href="http://cordis.europa.eu/pub/ist/docs/directorate_d/st-ds/edos-project-story_en.pdf" target="_blank">http://cordis.europa.eu/pub/is<wbr>t/docs/directorate_d/st-ds/edo<wbr>s-project-story_en.pdf</a> ), I ran a small experiment where I used, IIRC, the profile hook to intercept all function / method calls, and log information about arguments and return value types to a gigantic log file. Then the log file could be parsed and these information used to suggest type annotations. Except there were no type annotations at the time in Python.</div><div><br></div><div>I know PyCharm can do a similar thing now: you run your program or your tests under the debugger, it logs runtime type information somewhere, and then can use it to suggest autocompletion or maybe type annotations.</div></div></blockquote><div><br></div></span><div>I didn't know this. Do you know where there are docs for this feature?<br></div></div></div></div></blockquote><div><br></div><div>This was described in this blog post when first introduced:</div><div><br></div><div><a href="https://blog.jetbrains.com/pycharm/2013/02/dynamic-runtime-type-inference-in-pycharm-2-7/">https://blog.jetbrains.com/pycharm/2013/02/dynamic-runtime-type-inference-in-pycharm-2-7/</a></div><div><br></div><div>And more tersely, in the documentation: <a href="https://www.jetbrains.com/help/pycharm/python-debugger.html">https://www.jetbrains.com/help/pycharm/python-debugger.html</a></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><span class="gmail-"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>a) record runtime type information from test or regular runs<br></div><div>b) massage these information and use them to annotate Python code with additional type information (up to the developer to then accept or not the proposed changes)</div></div></blockquote><div><br></div></span><div>We have an early version of a tool that does this at Dropbox; I am planning to open-source it by the end of this year. So far the experience is that the annotations require a fair amount of manual cleanup though.</div></div></div></div></blockquote><div><br></div><div>That would be great !</div><div><br></div><div> S.</div><div> </div></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">Stefane Fermigier - <a href="http://fermigier.com/" target="_blank">http://fermigier.com/</a> - <a href="http://twitter.com/sfermigier" target="_blank">http://twitter.com/sfermigier</a> - <a href="http://linkedin.com/in/sfermigier" target="_blank">http://linkedin.com/in/sfermigier</a><br>Founder & CEO, Abilian - Enterprise Social Software - <a href="http://www.abilian.com/" target="_blank">http://www.abilian.com/</a><br>Chairman, Free&OSS Group / Systematic Cluster - <a href="http://www.gt-logiciel-libre.org/" target="_blank">http://www.gt-logiciel-libre.org/</a><br>Co-Chairman, National Council for Free & Open Source Software (CNLL) - <a href="http://cnll.fr/" target="_blank">http://cnll.fr/</a><div>Founder & Organiser, PyData Paris - <a href="http://pydata.fr/" target="_blank">http://pydata.fr/</a><br></div><div>---</div><div><div>“You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.” <span style="font-size:12.8px">— R. Buckminster Fuller</span></div></div><div><br><br></div></div></div></div></div></div></div></div>
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