A modern dependency manager for Python.

If you have py installed globally:

# create your new project dir
mkdir project
cd project

# create a virtual env and a py.toml file in the current dir
py init

If you do not want to have it installed globally:

# create your new project dir
mkdir project
cd project

# create a virtual env and install py in it
python3 -m venv myvenv
source myvenv/bin/activate
pip install pydepman

# detects the virtual env and sets it in py.toml
py init

# add the package and its desired version under [dependencies]
# e.g. add: django = "3.0.8"
vim py.toml

# installs django, asgiref, pytz, sqlparse
py sync

# edit the respective line under [dependencies]
# e.g. django = "3.0.8" → django = "3.1"
vim py.toml

# upgrades django, asgiref, pytz, sqlparse
py sync

# remove the respective line from [dependencies]
# e.g. remove: django = "3.1"
vim py.toml

# uninstalls django
# uninstalls each of asgiref, pytz, sqlparse unless used by another
# package listed in py.toml (or is listed there itself)
py sync

• py init

  Init a new project (a virtual environment and a py.toml file) in the current directory.

• py [SCRIPT]

  Run python in the virtual environment specified in py.toml. This command makes explicitly activating the virtual environment obsolete.

• py search PACKAGE

  Search for packages in the Cheese Shop.

• py show PACKAGE

  Show the details of a package. It does not matter whether the package is installed locally.

• py deps PACKAGE

  Show the dependency tree of a package. It does not matter whether the package is installed locally.

• py sync

  Install the dependencies (and their dependencies, all the way down) specified in py.toml and uninstall those that are missing. Write requirements.txt.

GPL. You can do what you want with this code as long as you let others do the same.