Best way to store and retrieve information

[Cecil Westerhof]

I have a Tcl script I use to check and update my pip installs. I
describe it here:
https://www.linkedin.com/pulse/check-update-rollback-pip-packages-cecil-westerhof/

At this moment pipManual contains the fields package and reason. In
the script only package is used: reason is for the human.

I want to extend it with two fields that are used by the program:
pipType and maxVersion. Because the actions can be dependent on pip
version and it has only to be done manual when the version is above
maxVersion. What would be the best data structure to use?

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Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof