Environment variable PYTHONUSERBASE is not set during customized Python Installation

[sarmar11]

BPO	39122
Nosy	@pfmoore, @tjguk, @zware, @zooba, @sarmar11

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-12-23.11:10:22.310>
labels = ['type-security', '3.7', 'OS-windows']
title = 'Environment variable PYTHONUSERBASE is not set during customized Python Installation'
updated_at = <Date 2019-12-23.11:10:22.310>
user = 'https://github.com/sarmar11'

bugs.python.org fields:

activity = <Date 2019-12-23.11:10:22.310>
actor = 'sarmar11'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Windows']
creation = <Date 2019-12-23.11:10:22.310>
creator = 'sarmar11'
dependencies = []
files = []
hgrepos = []
issue_num = 39122
keywords = []
message_count = 1.0
messages = ['358808']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'sarmar11']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'security'
url = 'https://bugs.python.org/issue39122'
versions = ['Python 3.7']

[sarmar11]

Environment variable PYTHONUSERBASE is not set during customized Python Installation.

Python installer 3.7.6(x64) / Windows 10

Check 1: Customize the installation to install Python in C:\Python37 for all users.
Result: Access Denied using pip

Check 2: Check 1: Customize the installation to install Python in C:\Program Files\Python37 for all users (default).
Result: pip works, but error appears trying to install anything with pip. For example:

>pip install virtualenv
WARNING: The script virtualenv.exe is intalled in 'C:\Users\XXX\AppData\Roaming\Python\Python37\Scripts' which is not on path

By default APPDATA matches with C:\Users\XXX\AppData\Roaming
and PYHTONUSERBASE is empty

-----------------------------------------------------------------

I've found the path constructor in \Python37\Lib\site.py (_getuserbase)

So I try the following steps:

• Create folder with full control in C:\ (C:\Python)
• Set environment variable PYTHONUSERBASE=C:\Python
• Install Python for all users in C:\Python\Python37

That works for me.