How to set local Environment with Python

Background

When I tryied to write some codes by python, I had a experience that a certain python version was not supported for several specific libraries. (some reason of bad compatibility?) I don’t remember what it was exactly..But it was really difficult and tiredsome work to configure all necessary setting, So after searching on google, finally I found there is a good way to handle it. The thing is you can set every each project environment locally with venv parameter.

How to set

1. Make and set venv file system trees.

python -m venv "mylocalEnv"

2. Activate and Deactivate venv(Windows)

Run each command for the usage.

• Activate : .\"mylocalEnv"\Script\activate
• Deactivate : deactivate

3. Install required libraries with a file of requirements.txt.

1. Fill out library list which needs to be install in local environment.
2. Run this command : pip install -r requirements.txt

4. Save and Remove all libraries in my virtual environment.

1. Save installed all libraries into requirements.txt.

pip freeze > requirements.txt

1. Remove all libraries by refering requirements.txt file.

# option1
pip uninstall -r requirements.txt 
# option2
pip uninstall -r requirements.txt -y