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#teach-me-skills #environment setup #pip #python #pyenv #poetry #pycharm
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teach-me-skills.md

Local Machine Installation & Configuration

Pip

Even though the package management for this repo is handled by Poetry, pip is still required to download and configure Python modules. To install pip:

sudo apt update
sudo apt install python3-pip

To check this has been installed correctly, simply run:

pip --help

To verify you have the latest version installed, run:

pip --version
pip 21.2.4

If an older version is installed, upgrade by running:

pip install --upgrade pip

Pyenv installation

Auto installation

curl https://pyenv.run | bash

Manual

Pyenv is used to easily control the versions of Python being used across different projects and repositories. To install pyenv:

sudo apt install -y make build-essential \
                         libssl-dev \
                         zlib1g-dev \
                         libbz2-dev \
                         libreadline-dev \
                         libsqlite3-dev \
                         wget \
                         curl \
                         llvm \
                         libncurses5-dev \
                         libncursesw5-dev \
                         xz-utils \
                         tk-dev \
                         libffi-dev \
                         liblzma-dev \
                         python-openssl \
                         git
git clone https://github.com/pyenv/pyenv.git ~/.pyenv
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bashrc
echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(pyenv init --path)"' >> ~/.bashrc
echo 'eval "$(pyenv init -)"' >> ~/.bashrc

Ensure to restart your terminal after performing the above. To check this has been installed correctly, simply run:

pyenv --help

Please ensure to install the pyenv-update plugin so that it can be updated from the command line. To do this:

git clone https://github.com/pyenv/pyenv-update.git $(pyenv root)/plugins/pyenv-update

This will allow pyenv to be updated by running the following. It is important to do this as pyenv caches the versions of Python available and so major and/or minor patches may not appear available to use without doing this.

pyenv update

This repository uses Python 3.9, so to install the latest version of that via pyenv:

pyenv install -v 3.9.9

This will take a few minutes as it builds Python from source. To then use this version of Python going forward:

pyenv local 3.9.9
pyenv global 3.9.9

To confirm the correct python version is being used, run the following command:

python --version
Python 3.9.9

To confirm the correct python version is being used by pyenv, run the following command:

pyenv version
3.9.9 (set by <directory>/pipeline-testing/.python-version)

Poetry

The project is managed by Poetry. To install poetry, please follow the official guide.

Once Poetry is installed, to create the virtual environment and install the necessary packages, run the following command from the root of this repo:

poetry config virtualenvs.in-project true
poetry install

This should create a .venv directory at the root of the repo.

PyCharm

After opening the pipeline-tests repo as a project inside PyCharm, it needs attaching as a standalone project within PyCharm. This allows it to be assigned its own Python interpreter (i.e. the virtual environment created by Poetry above). To do this:

  • Click File -> Open...
  • Select the pipeline-tests directory
  • Click OK
  • Select the Attach option to attach this as an additional project

Once done, the pipeline-tests directory in the Project pane should be bolded.

To configure the Python interpreter for the pipeline-tests project:

  • Open the PyCharm settings dialog (Ctrl+Alt+S)
  • Expand the Project caret in the pane on the left-hand side
  • Select Python Interpreter
  • Select pipeline-tests
  • Click the cog on the right-hand side of the dialog
  • Select Show All...
  • Click + to add a new interpreter
  • Select the Existing Environment radio button
  • Click the ... button
  • Navigate to pipeline-tests/.venv/bin/python
  • Click OK
  • Rename the new interpreter to pipeline-tests (for easier traceability)
  • Click OK
  • Click Apply

This should have correctly configured the pipeline-tests project to use the Python interpreter created by Poetry. To confirm:

  • Open any Python file in the pipeline-tests project
  • Expand the Imports section at the top of the file
  • All imports should be recognised and not underlined in red

Pre-commit checks

The pre-commit module is used to ensure the code in this repo adheres to a set of coding standards on each and every commit. To setup the pre-commit hooks, run the following (this only needs doing once):

poetry run pre-commit install --install-hooks

Before committing code, it is recommended that you run the following command to see if any changes have caused the static code analysis tools to highlight an issue:

poetry run pre-commit run --all-files

ChromeDriver

Install the latest release of the ChromeDriver.

Ensure to move the ChromeDriver executable to a location available to the system path:

sudo mv ~/Downloads/chromedriver /usr/local/bin

To test this is installed correctly, open a new terminal and run:

chromedriver
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