When it comes to programming language, Java is my goto langauge. But when I would like to try some sample realed to NLP or machine learning, I am compelled to use python because most of the examples were in python. As I follow the examples, I will try to do pip install as said in the examples. When I started doing different categories of examples (spacy, rasa, scikit etc..), I found that different libaries were depending on different version of libary and I messed up all my python installation with different version of those libary. Then I realized that it’s easier to use different python environment for different type of problems. Then I came to read a wonderful article about ‘pyenv’ and started using that. As I used pyenev further, I realized that eventhough I screwup that particular version of python it does not screw up all the system and I can live with other version peacefully. I could not find the original reference which I read that time hence here I can not point to that. Here I will be some other refer some other source which I found just before installing pyenv in a new system [1]. All the following commands are for mac os.

1. Install brew, if it’s not already installed

   /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
   

2. Install pyenv brew install pyenv
3. Install pyenv-virtualenv brew install pyenv-virtualenv
4. Once the installation completed, please use following command to see the avaialable python versiona pyenv install --list
5. Install some version which you would like to work on by specify that version pyenv install 3.9.0
6. To create a virtualenv for the desired python version pyenv virtualenv 3.9.0 your-virtual-env-name
7. You can see the created your-virtual-env-name by ls ~/.pyenv/versions
8. Open ~/.bash_profile and paste following commands, otherwise when we try to activate the created virtual environment we will get the following issue “pyenv-virtualenv has not been loaded into your shell properly” eval "$(pyenv init -)" eval "$(pyenv virtualenv-init -)"

9. Run bashrc by source ~/.bash_profile

10. Now activate your virtual env by pyenv activate your-virtual-env-name

11. If you want to remove your virtual env the you can simply remove the folder in ~/.pyenv/versions/virtual-env-name

References

1. [https://levelup.gitconnected.com/how-to-set-up-python-environment-on-your-mac-560ebf9324ed][ref-1]