Process().username() return badly decoding character

[PierreF]

On a Windows 10 using French locale, I have wrong character on my username:

> python.exe -c "import psutil;print(psutil.Process().username())
MSEDGEWIN10\D�mo

In reality the user is named "Démo".

Call to user is also affected:

> python.exe -c "import psutil;print(psutil.users())
[suser(name='D�mo', ...

Version tested:

• Python 3.6.0 - amd64 (using official Python webinstaller)
• Python 3.6.0 - 32 bits (using embedded Python)

psutil version 5.0.1 from pypi (wheel, not built locally).

My current guess is that from my understanding of documentation of Microsoft, result from API are using a Windows code page (cp1252 in my case) and psutil decode using Py_FileSystemDefaultEncoding (utf-8 in my case).

[giampaolo]

The same issue should affect at least also psutil.users().