[PyQt] Simple installation of PyQt5 version 5.6 results in an immediate core dump

[Gehlhaar, Dan]

Hello, everyone.

I need to install PyQt 5.6 (I can't use a more recent version) on Windows 10 Pro 64 bit.  I hit problems so I went back to a clean installation, and can reproduce a core dump at will. Any advice is appreciated.  Starting from a clean 64-bit installation of Python 3.5.3:

C:\Users\gehlhaar\Python35>Scripts\pip3.exe --no-cache-dir install "PyQt5 < 5.7"
Collecting PyQt5<5.7
  Downloading PyQt5-5.6-cp35-none-win_amd64.whl (74.7MB)
    100% |################################| 74.7MB 5.1MB/s
Collecting sip (from PyQt5<5.7)
  Downloading sip-4.19.3-cp35-none-win_amd64.whl (49kB)
    100% |################################| 51kB 5.7MB/s
Installing collected packages: sip, PyQt5
Successfully installed PyQt5-5.6 sip-4.19.3

C:\Users\gehlhaar\Python35>.\python
Python 3.5.3 (v3.5.3:1880cb95a742, Jan 16 2017, 16:02:32) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt5.QtCore import *
<crash>

I am flummoxed here... Any ideas?  I am attempting to build PyQt5 from source but somehow I am not confident that will help...

Thanks,
Dan
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