Hi Team, Trying to understand

Pants 2.21.0

behavior in following scenario: 1. Create a

virtualenv

thru

pants export

to be used in IDE. 2. Do usual development work. 3. Run

pants test ::

4. Update

requirements.txt

for the development of a new feature. 5. Develop the feature. 6. Run

pants test ::

—> I assume tests will be run after resolving the latest

requirements.txt

. Please confirm. At this point, do I explicitly need to run

pants export

again? Or would the

virtualenv

from step #1 would automatically be updated based on the new resolve from step #5? I expect it should automatically update the

virtualenv

but please confirm.

Hi, There's currently no invalidation on exported virtualenvs (nor the lockfiles!), so you need to re-run

pants export

and

pants generate-lockfiles

(if you use lockfiles, which is recommended to do) after changing

requirements.txt

Technically, there is a situation where you don't need to run generate-lockfiles the second time - if you've added a requirement that was already in the lockfile because of transitive dependency. But even then it's better to generate it :)