Matplotlib ImportError

[robertinoc]

Hi!
I use Thonny that it has the Python included (version 3.7.2 32 bit) and I downloaded the maplotlib extensions with Thonny.
I also tried to installed Matplotlib with the command pip install matplotlib, but it does not work.
Excuse for my English, my native Language is Italian.
Today, I installed Visual Studio Community with Python support and Python 3.7.3 32 bit and 64 bit version and I installed matplotlib inside Visual Studio. But also with VS, the library matplotlib does not work, the message here is

Error:
No module named 'matplotlib'

Now, if I use Thonny matplotlib is working . Instead in VS is not working.

Bye!