How to determine if Python is running inside a virtualenv?

The reliable and documented way is to compare sys.prefix and sys.base_prefix. If they’re equal, you’re not in a virtual environment, otherwise you are. Inside a venv, sys.prefix points to the directory of the virtual environment, and sys.base_prefix to the Python interpreter used to create the environment. This is documented under How venvs work: It is … Read more

Is there a single line way to run a command in a Python venv?

You can generally run something in a virtual environment simply by using a fully qualified path to the script. For example, if I have: virtualenv .venv Then I can install something into that virtual environment without activating it by running: .venv/bin/pip install foo This should be true for anything installed using standard Python mechanisms.

How to run Tensorboard from python scipt in virtualenv?

Using Tensorboard 2 API (2019): from tensorboard import program tracking_address = log_path # the path of your log file. if __name__ == “__main__”: tb = program.TensorBoard() tb.configure(argv=[None, ‘–logdir’, tracking_address]) url = tb.launch() print(f”Tensorflow listening on {url}”) Note: tb.launch() create a daemon thread that will die automatically when your process is finished

Is it possible to run opencv (python binding) from a virtualenv?

I found the solution was that I had to copy over cv2.so and cv.py to the directory running the virtualenv, then pip install numpy. To do this on Ubuntu 12.04 I used. virtualenv virtopencv cd virtopencv cp /usr/local/lib/python2.7/dist-packages/cv* ./lib/python2.7/site-packages/ ./bin/pip install numpy source bin/activate python import cv