Python-Example-Collection

Install using pip

As of Python 3.3, the build-in venv package created a virtual environment python -m venv env_dir_name [--prompt my_proj]. The --prompt parameter is optional. If it is not supplied, the prompt will match the directory name. As of Python 3.9, providing --prompt . will tell venv to use the parent directory as the prompt.

See also: https://docs.python.org/3/library/venv.html

Create a virtual environment, activate it on POSIX systems, and install a package

$ python3 -m venv venv_name
$ source venv_name/bin/activate
(venv_name) ...$ pip install pytest

or using virtualenv

$ python3 -m pip install virtualenv
$ python3 -m virtualenv venv_name
$ source venv_name/bin/activate
(venv_name) ...$ pip install pytest

Deactivate the venv

(venv_name) ...$ deactivate

Create a virtual environment, activate it on Windows systems, and install pytest

>python -m venv venv_name
>venv_name\Scripts\activate.bat
(venv_name) ...> pip install pytest

Activate in PowerShell

>venv_name\Scripts\Activate.ps1

Install a local package

Install a local pacḱage located in the current directory

$ pip install ./my_package

Install packages in editable mode

Editable mode refers to a way of installing a Python package such that any changes you make to the source code are immediately reflected without needing to reinstall the package.

Install in editable mode from the current directory

(venv_editable) ...$ pip install -e .

Install in editable mode with optional dependencies for testing

(venv_editable) ...$ pip install -e "./cards_proj_failed/[test]"

[test] in the -e parameters refers to optional dependencies for testing given in pyproject.toml.

Other installation capabilities

Install from GitHub

$ pip install git+https://github.com/okken/pytest-skip-slow

Specify a version to install

$ pip install git+https://github.com/pytest-dev/pytest-cov@v2.12.1

Specify a branch to install

$ pip install git+https://github.com/pytest-dev/pytest-cov@master

Install from .whl

$ pip install <package> --no-index --find-links=<path/to/packages>

Download a bunch of various versions into a local cache of packages, and then point pip there instead of PyPI to install them into virtual environments later. This is great for situations like running tox or CI test suites without needing to grab packages from PyPI.

(venv) ...$ mkdir ~/.pipcache
(venv) ...$ pip download -d ~/pipcache pytest
...
(venv) ...$ pip install --no-index --find-links=~/pipcache pytest

See also: https://pip.pypa.io/en/stable/

Publish packages to PyPI

https://packaging.python.org/en/latest/tutorials/packaging-projects/#uploading-the-distribution-archives

https://flit.pypa.io/en/latest/upload.html#controlling-package-uploads

johnnydep

$ johnnydep pandas==2.2.0 --verbose 0