New submission from Kagami Sascha Rosylight <sascha...@outlook.com>:

```
$ python3.7
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit 
(AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os;os.path.realpath('c:/')
'c:\\'
```

```
$ python3.8
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit 
(AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os;os.path.realpath('c:/')
'C:\\'
```

This behavior is inconsistent with `os.path.abspath` where it always returns 
lowercased drive letter, and also causes a failure in Gecko build script: 
https://bugzilla.mozilla.org/show_bug.cgi?id=1628726

----------
messages: 367053
nosy: saschanaz
priority: normal
severity: normal
status: open
title: os.path.realpath uppercases Windows drive letter on Python 3.8
type: behavior
versions: Python 3.8

_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40368>
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