Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:

That's not a crash. You are trying to install a package using pip, pip sees 
that it is missing the METADATA file and reports a problem. That is working 
correctly, not a crash.

There is no way for us to know how the metadata file got deleted. Maybe you 
deleted it yourself by accident? Maybe an anti-virus program moved it. Maybe 
you never installed it. Maybe the traits package is broken and you need to 
report the issue to them.

But whatever the problem is, it isn't a problem with your Python installation. 
You can reinstall Python a million times, that isn't going to make the traits 
METADATA file reappear.

If you are absolutely sure that the traits package doesn't have a METADATA 
file, you should report this to the maintainers of the traits package. 

The *second* problem you report is a missing io.h file. That sounds like it has 
been deleted. Again, we have no way of knowing how. Unless someone reproduces 
that error we can only guess that this is something specific to your system and 
not a problem with Python.

The *third* problem you report is with chalice. Again, this has nothing to do 
with Python, it is a third-party library and pip is doing exactly the right 
thing. chalice has unmet dependencies and cannot be installed, so pip is 
reporting the problem. You should complain to the chalice maintainers that 
their requirements are too strict.

I don't think any of these problems have anything to do with Python itself, so 
I'm going to close this issue as "Third Party". If you have additional 
information which shows that it is a Python problem, please tell us and we will 
re-open the issue.

----------
nosy: +steven.daprano
resolution:  -> third party
stage:  -> resolved
status: open -> closed

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<https://bugs.python.org/issue35938>
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