Pipenv: Sacred Marriage of Pipfile, Pip, & Virtualenv

Pipenv — the officially recommended Python packaging tool from Python.org, free (as in freedom).

Pipenv harnesses Pipfile, Pip, and Virtualenv together in unison to create a single, high-quality tool that is optimized for workflow efficiency and best practices. Windows is a first–class citizen, in our world.

Pipenv automatically creates and manages the virtualenvs of your projects, as well as adds/removes packages from your Pipfile as you install/uninstall packages. The lock command generates a lockfile (Pipfile.lock).

The problems that Pipenv seeks to solve are multi-faceted:

When using Pipenv, you no longer need to use pip and virtualenv separately. They work together.
Managing a requirements.txt file can be problematic, so Pipenv uses the upcoming Pipfile and Pipfile.lock instead, which is superior for basic use cases.
Hashes are used everywhere, always. Security.

Installation

$ pip install pipenv

✨🍰✨

☤ User Testimonials

Jannis Leidel, former pip maintainer—: Pipenv is the porcelain I always wanted to build for pip. It fits my brain and mostly replaces virtualenvwrapper and manual pip calls for me. Use it.
Jhon Crypt—: Pipenv is the best thing since pip, thank you!
Isaac Sanders—: Pipenv is literally the best thing about my day today. Thanks, Kenneth!

☤ Features

Enables truly deterministic builds, while easily specifying what you want.
Generates and checks file hashes for locked dependencies (via --hashes).
Automatically finds your project home, recursively, by looking for a Pipfile.
Automatically generates a Pipfile, if one doesn't exist.
Automatically generates a Pipfile.lock, if one doesn't exist.
Automatically creates a virtualenv in a standard location.
Automatically adds packages to a Pipfile when they are installed.
Automatically removes packages from a Pipfile when they are un-installed.
Also automatically updates pip.

The main commands are install, uninstall, and lock, which generates a Pipfile.lock. These are intended to replace $ pip install usage, as well as manual virtualenv management (to activate a virtualenv, run $ pipenv shell).

Basic Concepts

A virtualenv will automatically be created, when one doesn't exist.
When no parameters are passed to install, all packages [packages] specified will be installed.
To initialize a Python 3 virtual environment, run $ pipenv --three.
To initialize a Python 2 virtual environment, run $ pipenv --two.
Otherwise, whatever virtualenv defaults to will be the default.

Other Commands

shell will spawn a shell with the virtualenv activated.
run will run a given command from the virtualenv, with any arguments forwarded (e.g. $ pipenv run python).
check asserts that PEP 508 requirements are being met by the current environment.
graph will print a pretty graph of all your installed dependencies.

Shell Completion

Set _PIPENV_COMPLETE and then source the output of the program. For example, with fish, put this in your ~/.config/fish/completions/pipenv.fish:

eval (env _PIPENV_COMPLETE=source-fish pipenv)

Magic shell completions are now enabled! There is also a fish plugin, which will automatically activate your subshells for you!

Fish is the best shell. You should use it.

☤ Usage

$ pipenv
Usage: pipenv [OPTIONS] COMMAND [ARGS]...

Options:
  --update         Update Pipenv & pip to latest.
  --where          Output project home information.
  --venv           Output virtualenv information.
  --rm             Remove the virtualenv.
  --bare           Minimal output.
  --three / --two  Use Python 3/2 when creating virtualenv.
  --python TEXT    Specify which version of Python virtualenv
                   should use.
  -h, --help       Show this message then exit.
  -j, --jumbotron  An easter egg, effectively.
  --version        Show the version and exit.


Usage Examples:
   Create a new project using Python 3:
   $ pipenv --three

   Install all dependencies for a project (including dev):
   $ pipenv install --dev

   Create a lockfile:
   $ pipenv lock

Commands:
  check      Checks PEP 508 markers provided in Pipfile.
  graph      Displays currently–installed dependency graph...
  install    Installs provided packages and adds them to...
  lock       Generates Pipfile.lock.
  run        Spawns a command installed into the...
  shell      Spawns a shell within the virtualenv.
  uninstall  Un-installs a provided package and removes it...
  update     Updates Pipenv & pip to latest, uninstalls...

Locate the virtualenv:

$ pipenv --where
Pipfile found at /Users/kennethreitz/repos/kr/pip2/test/Pipfile. Considering this to be the project home.

Install packages:

$ pipenv install
Creating a virtualenv for this project...
...
No package provided, installing all dependencies.
Virtualenv location: /Users/kennethreitz/.local/share/virtualenvs/test-EJkjoYts
Installing dependencies from Pipfile.lock...
...

To activate this project's virtualenv, run the following:
$ pipenv shell

Install a dev dependency:

$ pipenv install pytest --dev
Installing pytest...
...
Adding pytest to Pipfile's [dev-packages]...

Show a dependency graph:

$ pipenv graph
pip==9.0.1
regex==2017.7.28
requests==2.18.4
  - certifi [required: >=2017.4.17, installed: 2017.7.27.1]
  - chardet [required: >=3.0.2,<3.1.0, installed: 3.0.4]
  - idna [required: >=2.5,<2.7, installed: 2.6]
  - urllib3 [required: <1.23,>=1.21.1, installed: 1.22]
setuptools==36.4.0
wheel==0.29.0

Generate a lockfile:

$ pipenv lock
Assuring all dependencies from Pipfile are installed...
Locking [dev-packages] dependencies...
Locking [packages] dependencies...
Note: your project now has only default [packages] installed.
To install [dev-packages], run: $ pipenv install --dev

Install all dev dependencies:

$ pipenv install --dev
Pipfile found at /Users/kennethreitz/repos/kr/pip2/test/Pipfile. Considering this to be the project home.
Pipfile.lock out of date, updating...
Assuring all dependencies from Pipfile are installed...
Locking [dev-packages] dependencies...
Locking [packages] dependencies...

Uninstall everything:

$ pipenv uninstall --all
No package provided, un-installing all dependencies.
Found 25 installed package(s), purging...
...
Environment now purged and fresh!

Use the shell:

$ pipenv shell
Spawning virtualenv shell (/bin/zsh).
(test)$

☤ Documentation

Documentation resides over at pipenv.org.

nhuntwalker/pipenv