Python Development Workflow for Humans.
Project description
Pipenv: Python Development Workflow for Humans
Pipenv is a Python virtualenv management tool that supports a multitude of systems and nicely bridges the gaps between pip, python (using system python, pyenv or asdf) and virtualenv. Linux, macOS, and Windows are all first-class citizens in pipenv.
Pipenv automatically creates and manages a virtualenv for your projects, as well as adds/removes packages from your Pipfile as you install/uninstall packages. It also generates a project Pipfile.lock, which is used to produce deterministic builds.
Pipenv is primarily meant to provide users and developers of applications with an easy method to arrive at a consistent working project environment.
The problems that Pipenv seeks to solve are multi-faceted:
- You no longer need to use
pipandvirtualenvseparately: they work together. - Managing a
requirements.txtfile with package hashes can be problematic. Pipenv usesPipfileandPipfile.lockto separate abstract dependency declarations from the last tested combination. - Hashes are documented in the lock file which are verified during install. Security considerations are put first.
- Strongly encourage the use of the latest versions of dependencies to minimize security risks arising from outdated components.
- Gives you insight into your dependency graph (e.g.
$ pipenv graph). - Streamline development workflow by supporting local customizations with
.envfiles.
Table Of Contents
Installation
Pipenv can be installed with Python 3.7 and above.
For most users, we recommend installing Pipenv using pip:
pip install --user pipenv
Or, if you're using Fedora:
sudo dnf install pipenv
Or, if you're using FreeBSD:
pkg install py39-pipenv
Or, if you're using Gentoo:
sudo emerge pipenv
Or, if you're using Void Linux:
sudo xbps-install -S python3-pipenv
Alternatively, some users prefer to use Pipx:
pipx install pipenv
Or, some users prefer to use Python pip module
python -m pip install pipenv
Refer to the documentation for latest instructions.
✨🍰✨
Features
- Enables truly deterministic builds, while easily specifying only what you want.
- Generates and checks file hashes for locked dependencies.
- Automatically install required Pythons, if
pyenvorasdfis available. - Automatically finds your project home, recursively, by looking for a
Pipfile. - Automatically generates a
Pipfile, if one doesn't exist. - Automatically creates a virtualenv in a standard location.
- Automatically adds/removes packages to a
Pipfilewhen they are installed/uninstalled. - Automatically loads
.envfiles, if they exist.
For command reference, see Commands.
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. - Otherwise, whatever virtualenv defaults to will be the default.
Shell Completion
To enable completion in fish, add this to your configuration ~/.config/fish/completions/pipenv.fish:
eval (env _PIPENV_COMPLETE=fish_source pipenv)
There is also a fish plugin, which will automatically activate your subshells for you!
Alternatively, with zsh, add this to your configuration ~/.zshrc:
eval "$(_PIPENV_COMPLETE=zsh_source pipenv)"
Alternatively, with bash, add this to your configuration ~/.bashrc or ~/.bash_profile:
eval "$(_PIPENV_COMPLETE=bash_source pipenv)"
Magic shell completions are now enabled!
Usage
$ pipenv --help
Usage: pipenv [OPTIONS] COMMAND [ARGS]...
Options:
--where Output project home information.
--venv Output virtualenv information.
--py Output Python interpreter information.
--envs Output Environment Variable options.
--rm Remove the virtualenv.
--bare Minimal output.
--man Display manpage.
--support Output diagnostic information for use in
GitHub issues.
--site-packages / --no-site-packages
Enable site-packages for the virtualenv.
[env var: PIPENV_SITE_PACKAGES]
--python TEXT Specify which version of Python virtualenv
should use.
--clear Clears caches (pipenv, pip). [env var:
PIPENV_CLEAR]
-q, --quiet Quiet mode.
-v, --verbose Verbose mode.
--pypi-mirror TEXT Specify a PyPI mirror.
--version Show the version and exit.
-h, --help Show this message and exit.
Usage Examples:
Create a new project using Python 3.7, specifically:
$ pipenv --python 3.7
Remove project virtualenv (inferred from current directory):
$ pipenv --rm
Install all dependencies for a project (including dev):
$ pipenv install --dev
Create a lockfile containing pre-releases:
$ pipenv lock --pre
Show a graph of your installed dependencies:
$ pipenv graph
Check your installed dependencies for security vulnerabilities:
$ pipenv check
Install a local setup.py into your virtual environment/Pipfile:
$ pipenv install -e .
Use a lower-level pip command:
$ pipenv run pip freeze
Commands:
check Checks for PyUp Safety security vulnerabilities and against
PEP 508 markers provided in Pipfile.
clean Uninstalls all packages not specified in Pipfile.lock.
graph Displays currently-installed dependency graph information.
install Installs provided packages and adds them to Pipfile, or (if no
packages are given), installs all packages from Pipfile.
lock Generates Pipfile.lock.
open View a given module in your editor.
requirements Generate a requirements.txt from Pipfile.lock.
run Spawns a command installed into the virtualenv.
scripts Lists scripts in current environment config.
shell Spawns a shell within the virtualenv.
sync Installs all packages specified in Pipfile.lock.
uninstall Uninstalls a provided package and removes it from Pipfile.
update Runs lock, then sync.
upgrade Update the lock of the specified dependency / sub-dependency,
but does not actually install the packages.
verify Verify the hash in Pipfile.lock is up-to-date.
Locate the project:
$ pipenv --where
/Users/kennethreitz/Library/Mobile Documents/com~apple~CloudDocs/repos/kr/pipenv/test
Locate the virtualenv:
$ pipenv --venv
/Users/kennethreitz/.local/share/virtualenvs/test-Skyy4vre
Locate the Python interpreter:
$ pipenv --py
/Users/kennethreitz/.local/share/virtualenvs/test-Skyy4vre/bin/python
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
Installing from git:
You can install packages with pipenv from git and other version control systems using URLs formatted according to the following rule:
<vcs_type>+<scheme>://<location>/<user_or_organization>/<repository>@<branch_or_tag>#<package_name>
The only optional section is the @<branch_or_tag> section. When using git over SSH, you may use the shorthand vcs and scheme alias git+git@<location>:<user_or_organization>/<repository>@<branch_or_tag>#<package_name>. Note that this is translated to git+ssh://git@<location> when parsed.
Valid values for <vcs_type> include git, bzr, svn, and hg. Valid values for <scheme> include http,, https, ssh, and file. In specific cases you also have access to other schemes: svn may be combined with svn as a scheme, and bzr can be combined with sftp and lp.
Note that it is strongly recommended that you install any version-controlled dependencies in editable mode, using pipenv install -e, in order to ensure that dependency resolution can be performed with an up to date copy of the repository each time it is performed, and that it includes all known dependencies.
Below is an example usage which installs the git repository located at https://github.com/requests/requests.git from tag v2.19.1 as package name requests:
$ pipenv install -e git+https://github.com/requests/requests.git@v2.19#egg=requests
Creating a Pipfile for this project...
Installing -e git+https://github.com/requests/requests.git@v2.19.1#egg=requests...
[...snipped...]
Adding -e git+https://github.com/requests/requests.git@v2.19.1#egg=requests to Pipfile's [packages]...
[...]
You can read more about pip's implementation of vcs support here.
Install a dev dependency:
$ pipenv install pytest --dev
Installing pytest...
...
Adding pytest to Pipfile's [dev-packages]...
Show a dependency graph:
$ pipenv graph
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]
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
Loading .env environment variables...
Launching subshell in virtual environment. Type 'exit' or 'Ctrl+D' to return.
$ ▯
PURPOSE AND ADVANTAGES OF PIPENV
To understand the problems that Pipenv solves, it's useful to show how Python package management has evolved.
Take yourself back to the first Python iteration. We had Python, but there was no clean way to install packages.
Then came Easy Install, a package that installs other Python packages with relative ease. But it came with a catch: it wasn't easy to uninstall packages that were no longer needed.
Enter pip, which most Python users are familiar with. pip lets us install and uninstall packages. We could specify versions, run pip freeze > requirements.txt to output a list of installed packages to a text file, and use that same text file to install everything an app needed with pip install -r requirements.txt.
But pip didn't include a way to isolate packages from each other. We might work on apps that use different versions of the same libraries, so we needed a way to enable that.
Pipenv aims to solve several problems. First, the problem of needing the pip library for package installation, plus a library for creating a virtual environment, plus a library for managing virtual environments, plus all the commands associated with those libraries. That's a lot to manage. Pipenv ships with package management and virtual environment support, so you can use one tool to install, uninstall, track, and document your dependencies and to create, use, and organize your virtual environments. When you start a project with it, Pipenv will automatically create a virtual environment for that project if you aren't already using one.
Pipenv accomplishes this dependency management by abandoning the requirements.txt norm and trading it for a new document called a Pipfile. When you install a library with Pipenv, a Pipfile for your project is automatically updated with the details of that installation, including version information and possibly the Git repository location, file path, and other information.
Second, Pipenv wants to make it easier to manage complex interdependencies.
Using Pipenv, which gives you Pipfile, lets you avoid these problems by managing dependencies for different environments for you. This command will install the main project dependencies:
pipenv install
Adding the --dev tag will install the dev/testing requirements:
pipenv install --dev To generate a Pipfile.lock file, run:
pipenv lock
You can also run Python scripts with Pipenv. To run a top-level Python script called hello.py, run:
pipenv run python hello.py
And you will see your expected result in the console.
To start a shell, run:
pipenv shell
If you would like to convert a project that currently uses a requirements.txt file to use Pipenv, install Pipenv and run:
pipenv install requirements.txt
This will create a Pipfile and install the specified requirements.
Documentation
Documentation resides over at pipenv.pypa.io.
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