PyBCN - pipenv - python dev workflow for humans

Pipenv!
Python Dev Workflow
for Humans
Andreu Vallbona
PyBCN February 2019

Pipenv: Python Dev Workflow for Humans
Andreu Vallbona - PyBCN - February 2019
Who am I
Andreu Vallbona @avallbona
Bachelor degree in computer science
Web developer at APSL, Mallorca, Spain
Mainly developing with Python and Django

What we do at APSL
Web development
Systems engineering - devops
Data science
Mobile apps
Consulting and formation

What it is?
it’s a package and virtualenv
managing system
it’s aimed to replace
the use of pip and virtualenv

Created by
Kenneth Reitz
Creator of many
useful projects such as:
Requests: HTTP for Humans
Maya: Datetimes for Humans
Records: SQL for Humans
Requests-HTML: HTML Parsing for Humans

Current state of the art
Before pipenv we used to
create a python environment
with virtualenv
install some packages
freeze the dependencies

requirements.txt anatomy
list of dependencies
with pinned versions

Problems
Problems

Problems
pip and virtualenv are concepts
difficult to understand for beginners

Problems
requirements.txt
is difficult to maintain

Problems
we have to remember
to update the requirements.txt file

Problems
For different environments
we need to maintain
several requirements.txt files

Problems
we do not easily know
what python version
the project uses

Problems
transitive relations
A -> B -> C

Solutions
Solutions

What problems does pipenv solve?
avoid manually maintenance
of the dependencies

easy to know which
version of python
the project uses

show us the dependencies
in a more concise way

update dependencies
securely and automatically

allow us to have a
default environment
and a development environment

Installation
Installation

Installation
pip install --user pipenv

Pipfile anatomy
Specify the packages we want
Production and development
sections
Human readable
Toml format
Specify the python version

Pipfile.lock anatomy
Specify the packages we need
Json format
Machine readable
Easy to parse
Pinned versions
Hashes

Usage
Usage

Usage
pipenv install
creates the virtualenv

Usage

Usage
pipenv shell
activates the virtualenv

Usage
pipenv install <package-name>
install a package

Usage
pipenv install <package-name> --dev
install a package
in the development environment

Usage
pipenv uninstall <package-name>
uninstall a package

Usage
pipenv clean
uninstall packages
not specified in Pipfile.lock

Usage
pipenv graph
Displays currently installed
dependency graph information

Usage
pipenv run command
runs a command inside
the virtualenv without activating it

Usage
pipenv check
checks for security vulnerabilities

Usage
pipenv lock -r > requirements.txt
generates a requirements.txt file

Usage
pipenv install -r requirements.txt
imports a requirements.txt file

Usage
load .env files automatically

usage
pipenv install -c .
can discover requirements
from the codebase

usage

usage
pipenv check --unused .
show potentially
unused dependencies

Integration
Integration

Integration with pyenv
pipenv --python 3.4.1 install
integrates well with pyenv

Integration with pyenv

Integration with docker

Integration with platforms and editors
integrated with
platforms and editors
Heroku (Cloud Hosting)
Platform.sh (Cloud Hosting)
PyUp (Security Notification)
Emacs (Editor Integration)
Fish Shell
(Automatic $ pipenv shell!)
VS Code (Editor Integration)
PyCharm (Editor Integration)

utility
Utility

utility
Pipenv Pipes
https://github.com/gtalarico/pipenv-pipes
Pipenv Environment Switcher

utility

caveats
Caveats

caveats
It’s slow when locking dependencies
Always tries to update
dependencies by default

alternatives
Alternatives

alternatives
Poetry
https://poetry.eustace.io/
Hatch
https://github.com/ofek/hatch

thanks
Thank you!
Questions?
@avallbona

resources of interest
https://www.pythonforbeginners.com/basics/how-to-use-pip-and-pypi
https://realpython.com/pipenv-guide/
https://www.kennethreitz.org/essays/announcing-pipenv
https://nvie.com/posts/better-package-management/
https://nvie.com/posts/pin-your-packages/
https://medium.com/@jimjh/managing-dependencies-in-python-applications-b9c93dda98c2

resources of interest
https://www.promptworks.com/blog/pin-all-dependencies
https://www.well-typed.com/blog/2008/04/the-dreaded-diamond-dependency-problem/
https://medium.com/@DJetelina/pipenv-review-after-using-in-production-a05e7176f3f0
https://chriswarrick.com/blog/2018/07/17/pipenv-promises-a-lot-delivers-very-little/
https://np.reddit.com/r/Python/comments/8jd6aq/why_is_pipenv_the_recommended_packaging_tool_by/
http://journal.kennethreitz.org/entry/r-python

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