General Background:
I’m learning Python and chose to make Vim my IDE (PyCharm was recommended). I’m currently building a cheap flight finder OOP, using Amadeus’ SDK installed in a virtualenv.

Specific problem:
Along with the SDK, I installed other packages, like requests, I thought I would need. As I dug in, I realized I needed the Pandas package as well. So while in Vim, in my venv with 4 buffers open, I typed:

:! pip install pandas

This opened a terminal session and installed Pandas successfully. When I returned to Vim, Pandas was not recognized as being installed. Otherwise, when I opened a new Vim session and activated the venv everything worked fine. But how can I get Vim to recognize the change I made without closing my buffers?