Now, I’m using a new clean environment, I can set it up for development: To get use one of these environments when I’m developing rst2pdf, I use pyenv local within the rst2pdf source directory to select that environment automatically: When I’m developing rst2pdf, I want separate environments so that I can change the dependencies without breaking my day-to-day version of rst2pdf: (With this set-up, pip is a synonym for pip3 and is one less character to type!) Create development environments and activate locally
Then, other interesting python scripts, such as the AWS CLI: We can now install python apps as required.įirstly, the released version of rst2pdf: This tells pyenv to look for a given app in the apps3 environment first and if it’s not there, look in apps2. We set these are my system-wide defaults using pyenv global: We create a new environment using the pyenv virtualenv command: I calls these environments apps2 and apps3 and put all my day-to-day apps and their dependencies in here, leaving the original Python installations clean for creating further environments for development work. In principle, you could have a separate environment for each application, but in practice, I’ve found that for my day-to-day apps, I can use the same environment for all apps for a given major Python version.
Separate environments, known as virtualenvs or venvs, isolate an app and its dependencies from another one. We can now set a given version as our system-wide python with pyenv global, however, it’s much more useful to set up isolated environments and use them. Use pyenv versions to see what’s installed. I install the latest versions of the Pythons that I’m interested in:
To list the available versions: pyenv install -l. Pyenv’s main job is to install different python versions into their own environments and allow you to swap between them, You can even set it up so that it will try multiple versions in order when you run a Python application which can be quite useful. Xz-utils tk-dev libffi-dev liblzma-dev python-openssl gitĪfter restarting the terminal, pyenv will be available to you. Libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \ $ sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \ On my Mac, I install pyenv & its sister project pyenv-virtualenv with Homebrew: When developing Python applications, I’ve found it useful to be able to switch python versions easily and also set up clean environments to work in.
Rst2pdf is a Python 2 application that we’re making compatible with Python 3.
0 kommentar(er)
