os.environ description implies environment variables automatically capitalized

[dwvisser]

Documentation

In the os package doc page, there is the following statement:

For example, environ['monty'] = 'python' maps the key 'MONTY' to the value 'python'.

I have tested, and actually this maps the key 'monty', not an all caps version of it.

>>> os.environ["monty"] = "python"
>>> "MONTY" in os.environ
False
>>> "monty" in os.environ
True

[hugovk]

What version of Windows did you try?

I get True and True on Microsoft Windows Server 2022 and 2025, and Windows 11 on ARM:

• https://github.com/hugovk/test/actions/runs/19575986397/job/56061306249#step:6:26
• https://github.com/hugovk/test/actions/runs/19575986397/job/56061306252#step:6:26
• https://github.com/hugovk/test/actions/runs/19575986397/job/56061306528#step:6:26

[dwvisser]

I just thought to check on Windows myself (Windows 11 Pro). This behavior seems to be Windows-specific. On Linux or WSL, environment variables are case sensitive. My example was Ubuntu 24.04 under a WSL virtual machine.

[dwvisser]

OMG, sorry for wasting your time. I missed the sentence before stating this was Windows-specific behavior.

[hugovk]

np :)