SHELL

conda create environment without packages

conda create --name myenv python=3.8 --no-default-packages

conda create new environment in specified location

# Use the --prefix or -p option to specify where to write the environment files. For example:
conda create --prefix /tmp/test-env python=2.7

create environment without conda

python3 -m venv env_name
source env_name/bin/activate
# If you have a req file:
pip install --upgrade -r requirements.txt