This list is based on helpful tips and discussions received on the core-mentorship list and aims to help new beginners review patches in the bug tracker. The submitted patch is still in progress (the layout is a bit wonky and some details are still missing).

Content of the article is in very reasonable shape, I have only couple of notes:
1. I don't think "production" is a good description of the python's repository workflow, so I'd suggest changing it to "repository".
2. Lack of links: instead of saying "check the devguide" a link to the relevant section would be useful. Though it applies even when no text is going to be saved.

Technically, there are couple more issues, such as extra empty lines at the start and end of file, page title should be followed by an empty line. Please trim all the trailing spaces. The list items should all have the same indentation. Importantly, please restrict width of each line to under 80 characters: while a couple characters above this limit typically will do no harm, the lines should generally be of the same width. More links!

+1 to the above message.

There are also a couple of things that should be corrected:
* bugtracker -> bug tracker
* If the patch makes codechanges to C codebase -> If the patch affects any C file

This could also be condensed a bit and merged with https://docs.python.org/devguide/patch.html#reviewing instead of creating a new page.

Thank you very much for your comments. I have cleaned up the previous patch and merged it with the Lifecycle of a Patch article.

New changeset 8b3f4473432e by Ned Deily in branch 'default':
Issue #25941: Add "How To Review A Patch" section to the devguide.
https://hg.python.org/devguide/rev/8b3f4473432e

The revised patch looks good to me (other than some trailing whitespace).  Camilla, thanks for your contribution.  If you haven't already, please sign a contributor form to cover this and future contributions as noted elsewhere in the Developer's Guide:

https://docs.python.org/devguide/coredev.html#sign-a-contributor-agreement