Paul <paule...@gmail.com> added the comment:

Clarification:
User is a local admin on the machine, and UAC is disabled as well.  I can also 
add, modify, and delete Registry entries in HKLM (or any other hive) by hand 
with no problem, so it is definitely not a permissions issue.  I can also 
write, update, modify, etc. anything in HKLM using C# just fine, but NOT with 
winreg in Python.  

Note:  Keep in mind that the exact same Registry write methods work as long as 
you are pointed to HKCU hive. However, if you point to HKLM and do not change 
anything else, winreg will throw a permissions error every time, no matter what 
combination of permission flags you specify.  There is no reason why a user 
should be able to write to HKCU but not HKLM.  Try it and you will experience 
the same.  This is clearly a major bug and should be fixed.  It severely limits 
developers from writing to other Registry hives.  While HKCU is quite common to 
use, HKLM is the most common that developers use, especially when you don't 
want specific Registry keys to be accessible only to a specific user.

You will be able to reproduce and see the problem if you try the two examples I 
provided.  Have you tried the two code snippets I provided yet?  Please do so, 
and confirm the outcome so that you are on the same page.

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44046>
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