Minimum Python version not detected if .python-version contains comments

[aciba90]

Is there an existing issue for this?

• I have searched the existing issues

Package ecosystem

pip

Package manager version

No response

Language version

No response

Manifest location and content before the Dependabot update

https://github.com/canonical/pycloudlib/blob/b02ba24b214ddf922491ee711b4ffe382c450da7/dev-requirements.txt

dependabot.yml content

https://github.com/canonical/pycloudlib/blob/b02ba24b214ddf922491ee711b4ffe382c450da7/.github/dependabot.yml

Updated dependency

No response

What you expected to see, versus what you actually saw

I expected dependabot to correctly detect the minimum Python version defined in .python-version and issue upgrades with correct python dependencies' versions.

If .python-version contains comments, then the suggested dependecies' versions were always the newest one.

Not working configuration: https://github.com/canonical/pycloudlib/blob/b02ba24b214ddf922491ee711b4ffe382c450da7/

Working configuration: canonical/pycloudlib#275

Native package manager behavior

No response

Images of the diff or a link to the PR, issue, or logs

This PR tried to bump flake8 to a version that was not compatible with python 3.6 (defined in .python-version):

canonical/pycloudlib#274

Smallest manifest that reproduces the issue

dependabot.yml:

version: 2
updates:
  - package-ecosystem: "pip"
    directory: "/"

.python-version:

3.6.5
# Specifies the python version that dependabot should use
# Note: The version must specify major.minor.patch components
# and be supported on:
# https://github.com/dependabot/dependabot-core/blob/7822f07e76cab9be6eca86a91aafc8d72bc42536/python/lib/dependabot/python/python_versions.rb

[mohammadalizabihitari]

Hi, I am working on this issue, will keep you updated as I progress