This all leads to a really fragmented ecosystem of Python environment and package managers, which solved different aspects of the above shortcomings in different ways - virtualenv, venv, conda, mamba, pdm, Poetry, Pipenv, rey, uv - to name a few. Some of them rely on pip, others ditch it...
The next instructionENV POETRY_VERSION=1.2.0sets an environment variable calledPOETRY_VERSIONto1.2.0which will be used in the next command to install the Poetry package manager. TheRUN pip install "poetry==$POETRY_VERSION"command installs the Poetry package manager inside the container, which is ...