Python-virtualenv, where are the standard modules?

Question

Python

Good afternoon.
Tell me, why, when creating a new environment, the standard modules of the system, which, in theory, go together with the interpreter, are not transferred?
Namely threading and _thread. Those. if I create an environment:
virtualenv --python=python3 NAME
And import the module in this environment:

python -c "import threading; print(threading.__file__)"
/usr/lib/python3.2/threading.py

I receive the response of the imported module from the global environment. This happens even when virtualenv --no-site-packages.

Answer 1

To quote from the documentation: "It creates an environment that has its own installation directories, that doesn't share libraries with other virtualenv environments (and optionally doesn't access the globally installed libraries either)."
Reading further, we find www.virtualenv.org/en/latest/virtualenv.html#using... . Profit!