upon running `pip install trains` in my virtual env

I am getting

```
    ERROR: Command errored out with exit status 1:
     command: /home/epdadmin/noam/code/venv_linux/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-owzh8lnl/retrying/setup.py'"'"'; __file__='"'"'/tmp/pip-install-owzh8lnl/retrying/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-lxz5t8pu/install-record.txt --single-version-externally-managed --compile --install-headers /home/epdadmin/noam/code/venv_linux/include/site/python3.8/retrying
         cwd: /tmp/pip-install-owzh8lnl/retrying/
    Complete output (10 lines):
    running install
    running build
    running build_py
    creating build
    creating build/lib
    copying retrying.py -> build/lib
    running install_lib
    copying build/lib/retrying.py -> /home/epdadmin/noam/code/venv_linux/lib/python3.8/site-packages
    byte-compiling /home/epdadmin/noam/code/venv_linux/lib/python3.8/site-packages/retrying.py to retrying.cpython-38.pyc
    error: [Errno 13] Permission denied: '/home/epdadmin/noam/code/venv_linux/lib/python3.8/site-packages/__pycache__/retrying.cpython-38.pyc.139678407381360'
    ----------------------------------------
ERROR: Command errored out with exit status 1: /home/epdadmin/noam/code/venv_linux/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-owzh8lnl/retrying/setup.py'"'"'; __file__='"'"'/tmp/pip-install-owzh8lnl/retrying/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-lxz5t8pu/install-record.txt --single-version-externally-managed --compile --install-headers /home/epdadmin/noam/code/venv_linux/include/site/python3.8/retrying Check the logs for full command output.

```

I know that [I am not supposed to run under sudo when using a venv](https://stackoverflow.com/questions/15028648/is-it-acceptable-and-safe-to-run-pip-install-under-sudo), so I don't really understand the problem

running for example `pip install pandas` does work.

Python 3.8

How to install trains?

---

EDIT:

running `pip install trains --user` or `pip install --user trains` gives

```
ERROR: Can not perform a '--user' install. User site-packages are not visible in this virtualenv.

```