Skip to main content

Dependency resolution for Python

Project description

DepHell MIT License Travis CI Powered by DepHell

DepHell – project management for Python.

See documentation for more details.


The simplest way:

python3 -m pip install --user dephell[full]

See installation documentation for better ways.

Supported formats

  1. Archives:

    1. *.egg-info (egginfo)

    2. *.tar.gz (sdist)

    3. *.whl (wheel)

  2. pip:

    1. requirements.txt (pip)

    2. requirements.lock (piplock)

  3. pipenv:

    1. Pipfile (pipfile)

    2. Pipfile.lock (pipfilelock)

  4. pоetry:

    1. pyproject.toml (poetry)

    2. poetry.lock (poetrylock)

  5. Other:

    1. (setuppy)

    2. pyproject.toml build-system requires (pyproject)

    3. Installed packages (installed).


First of all, install DepHell and activate autocomplete:

python3 -m pip install --user dephell[full]
dephell autocomplete

Let’s get sampleproject and make it better.

git clone
cd sampleproject

This project uses for dependenciesand metainfo. However, this format over-complicated for most of projects. Let’s convert it into poetry:

dephell deps convert --to=pyproject.toml

It will make next pyproject.toml:

name = "sampleproject"
version = "1.2.0"
description = "A sample Python project"
authors = ["The Python Packaging Authority <>"]
readme = ""

sample = "sample:main"

python = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,<4,>=2.7"
coverage = {optional = true}
peppercorn = "*"

check-manifest = "*"

test = ["coverage"]

Now, let’s generate some useful files:

dephell generate authors

dephell generate license MIT

dephell generate editorconfig

Our users, probably, has no installed poetry, but they, definitely, has pip that can install files from Let’s make it easier to generate from our pyproject.toml. Also, it points for DepHell your default dependencies file. Add next lines in the pyproject.toml:

from = {format = "poetry", path = "pyproject.toml"}
to = {format = "setuppy", path = ""}

You can see full real world example of config in DepHell’s own pyproject.toml.

Now we can call DepHell commands without explicitly specifying from and to:

dephell deps convert

It will make and README.rst from pyproject.toml and

Now let’s test our code into virtual environment:

$ dephell venv run pytest
WARNING venv does not exist, creating... (project=/home/gram/Documents/sampleproject, env=main, path=/home/gram/.local/share/dephell/venvs/sampleproject-Whg0/main)
INFO venv created (path=/home/gram/.local/share/dephell/venvs/sampleproject-Whg0/main)
WARNING executable does not found in venv, trying to install... (executable=pytest)
INFO build dependencies graph...
INFO installation...
# ... pip output
# ... pytest output

Also, we can just activate virtual environment for project and run any commands inside:

dephell venv shell

Ugh, we has tests, but has no pytest in our dependencies file. Let’s add it:

dephell deps add --envs dev test -- pytest

Afer that our dev-dependencies looks like this:

check-manifest = "*"
pytest = "*"

test = ["coverage", "pytest"]

One day we will have really many dependencies. Let’s have a look how many of them we have now:

$ dephell deps tree
- check-manifest [required: *, locked: 0.37, latest: 0.37]
- coverage [required: *, locked: 4.5.3, latest: 4.5.3]
- peppercorn [required: *, locked: 0.6, latest: 0.6]
- pytest [required: *, locked: 4.4.0, latest: 4.4.0]
  - atomicwrites [required: >=1.0, locked: 1.3.0, latest: 1.3.0]
  - attrs [required: >=17.4.0, locked: 19.1.0, latest: 19.1.0]
  - colorama [required: *, locked: 0.4.1, latest: 0.4.1]
  - funcsigs [required: >=1.0, locked: 1.0.2, latest: 1.0.2]
  - more-itertools [required: <6.0.0,>=4.0.0, locked: 5.0.0, latest: 7.0.0]
    - six [required: <2.0.0,>=1.0.0, locked: 1.12.0, latest: 1.12.0]
  - more-itertools [required: >=4.0.0, locked: 7.0.0, latest: 7.0.0]
  - pathlib2 [required: >=2.2.0, locked: 2.3.3, latest: 2.3.3]
    - scandir [required: *, locked: 1.10.0, latest: 1.10.0]
    - six [required: *, locked: 1.12.0, latest: 1.12.0]
  - pluggy [required: >=0.9, locked: 0.9.0, latest: 0.9.0]
  - py [required: >=1.5.0, locked: 1.8.0, latest: 1.8.0]
  - setuptools [required: *, locked: 41.0.0, latest: 41.0.0]
  - six [required: >=1.10.0, locked: 1.12.0, latest: 1.12.0]

Hm… Is it many or not? Let’s look on their size.

$ dephell inspect venv --filter=lib_size

Ugh… Ok, it’s Python. Are they actual?

$ dephell deps outdated
    "description": "More routines for operating on iterables, beyond itertools",
    "installed": [
    "latest": "7.0.0",
    "name": "more-itertools",
    "updated": "2019-03-28"

Pytest requires old version of more-itertools. That happens.

If our tests and dependencies are OK, it’s time to deploy. First of all, increment project version:

$ dephell project bump minor
INFO generated new version (old=1.2.0, new=1.3.0)

And then build packages:

$ dephell project build
INFO dumping... (format=setuppy)
INFO dumping... (format=egginfo)
INFO dumping... (format=sdist)
INFO dumping... (format=wheel)
INFO builded

Now, we can upload these packages on PyPI with twine.

This is some of the most useful commands. See documentation for more details.


DepHell tested on Linux and Mac OS X with Python 3.5, 3.6, 3.7. And one of the coolest things that DepHell ran by DepHell on Travis CI.

How can I help

  1. Star project on Github. Developers believe in the stars.

  2. Tell your fellows that Gram has made cool thing for you.

  3. Open an issue if you have thoughts how to make DepHell better.

  4. Things that you can contribute in any project in DepHell ecosystem:

    1. Fix grammar and typos.

    2. Document new things.

    3. Tests, we always need more tests.

    4. Make READMEs more nice and friendly.

    5. See issues by help wanted label to find things that you can fix.

    6. Anything what you want. If it is a new feature, please, open an issue before writing code.

Thank you :heart:

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

dephell-0.5.7.tar.gz (81.5 kB view hashes)

Uploaded Source

Built Distribution

dephell-0.5.7-py3-none-any.whl (134.4 kB view hashes)

Uploaded Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page