Is there a standard way to associate version string with a python package in such way that I could do the following?
import foo
print foo.version
I would imagine there's some way to retrieve that data without any extra hardcoding, since minor/major strings are specified in setup.py already. Alternative solution that I found was to have import __version__ in my foo/__init__.py and then have __version__.py generated by setup.py.
Not directly an answer to your question, but you should consider naming it __version__, not version.
This is almost a quasi-standard. Many modules in the standard library use __version__, and this is also used in lots of 3rd-party modules, so it's the quasi-standard.
Usually, __version__ is a string, but sometimes it's also a float or tuple.
Edit: as mentioned by S.Lott (Thank you!), PEP 8 says it explicitly:
Module Level Dunder Names
Module level "dunders" (i.e. names with two leading and two trailing underscores) such as
__all__,__author__,__version__, etc. should be placed after the module docstring but before any import statements except from__future__imports.
You should also make sure that the version number conforms to the format described in PEP 440 (PEP 386 a previous version of this standard).
I use a single _version.py file as the "once cannonical place" to store version information:
It provides a __version__ attribute.
It provides the standard metadata version. Therefore it will be detected by pkg_resources or other tools that parse the package metadata (EGG-INFO and/or PKG-INFO, PEP 0345).
It doesn't import your package (or anything else) when building your package, which can cause problems in some situations. (See the comments below about what problems this can cause.)
There is only one place that the version number is written down, so there is only one place to change it when the version number changes, and there is less chance of inconsistent versions.
Here is how it works: the "one canonical place" to store the version number is a .py file, named "_version.py" which is in your Python package, for example in myniftyapp/_version.py. This file is a Python module, but your setup.py doesn't import it! (That would defeat feature 3.) Instead your setup.py knows that the contents of this file is very simple, something like:
__version__ = "3.6.5"
And so your setup.py opens the file and parses it, with code like:
import re
VERSIONFILE="myniftyapp/_version.py"
verstrline = open(VERSIONFILE, "rt").read()
VSRE = r"^__version__ = ['\"]([^'\"]*)['\"]"
mo = re.search(VSRE, verstrline, re.M)
if mo:
verstr = mo.group(1)
else:
raise RuntimeError("Unable to find version string in %s." % (VERSIONFILE,))
Then your setup.py passes that string as the value of the "version" argument to setup(), thus satisfying feature 2.
To satisfy feature 1, you can have your package (at run-time, not at setup time!) import the _version file from myniftyapp/__init__.py like this:
from _version import __version__
Here is an example of this technique that I've been using for years.
The code in that example is a bit more complicated, but the simplified example that I wrote into this comment should be a complete implementation.
Here is example code of importing the version.
If you see anything wrong with this approach, please let me know.
After more than ten year of writing Python code and managing various packages I came to the conclusion that DIY is maybe not the best approach.
I started using pbr package for dealing with versioning in my packages. If you are using git as your SCM, this will fit into your workflow like magic, saving your weeks of work (you will be surprised about how complex the issue can be).
As of today pbr is ranked #11 most used python package and reaching this level didn't include any dirty tricks: was only one: fixing a common packaging problem in a very simple way.
pbr can do more of the package maintenance burden, is not limited to versioning but it does not force you to adopt all its benefits.
So to give you an idea about how it looks to adopt pbr in one commit have a look swiching packaging to pbr
Probably you would observed that the version is not stored at all in the repository. PBR does detect it from Git branches and tags.
No need to worry about what happens when you do not have a git repository because pbr does "compile" and cache the version when you package or install the applications, so there is no runtime dependency on git.
Here is the best solution I've seen so far and it also explains why:
Inside yourpackage/version.py:
# Store the version here so:
# 1) we don't load dependencies by storing it in __init__.py
# 2) we can import it in setup.py for the same reason
# 3) we can import it into your module module
__version__ = '0.12'
Inside yourpackage/__init__.py:
from .version import __version__
Inside setup.py:
exec(open('yourpackage/version.py').read())
setup(
...
version=__version__,
...
If you know another approach that seems to be better let me know.
Per the deferred PEP 396 (Module Version Numbers), there is a proposed way to do this. It describes, with rationale, an (admittedly optional) standard for modules to follow. Here's a snippet:
3) When a module (or package) includes a version number, the version SHOULD be available in the
__version__attribute.4) For modules which live inside a namespace package, the module SHOULD include the
__version__attribute. The namespace package itself SHOULD NOT include its own__version__attribute.5) The
__version__attribute's value SHOULD be a string.
Though this is probably far too late, there is a slightly simpler alternative to the previous answer:
__version_info__ = ('1', '2', '3')
__version__ = '.'.join(__version_info__)
(And it would be fairly simple to convert auto-incrementing portions of version numbers to a string using str().)
Of course, from what I've seen, people tend to use something like the previously-mentioned version when using __version_info__, and as such store it as a tuple of ints; however, I don't quite see the point in doing so, as I doubt there are situations where you would perform mathematical operations such as addition and subtraction on portions of version numbers for any purpose besides curiosity or auto-incrementation (and even then, int() and str() can be used fairly easily). (On the other hand, there is the possibility of someone else's code expecting a numerical tuple rather than a string tuple and thus failing.)
This is, of course, my own view, and I would gladly like others' input on using a numerical tuple.
As shezi reminded me, (lexical) comparisons of number strings do not necessarily have the same result as direct numerical comparisons; leading zeroes would be required to provide for that. So in the end, storing __version_info__ (or whatever it would be called) as a tuple of integer values would allow for more efficient version comparisons.
Many of these solutions here ignore git version tags which still means you have to track version in multiple places (bad). I approached this with the following goals:
git repogit tag/push and setup.py upload steps with a single command that takes no inputs.From a make release command, the last tagged version in the git repo is found and incremented. The tag is pushed back to origin.
The Makefile stores the version in src/_version.py where it will be read by setup.py and also included in the release. Do not check _version.py into source control!
setup.py command reads the new version string from package.__version__.
# remove optional 'v' and trailing hash "v1.0-N-HASH" -> "v1.0-N"
git_describe_ver = $(shell git describe --tags | sed -E -e 's/^v//' -e 's/(.*)-.*/\1/')
git_tag_ver = $(shell git describe --abbrev=0)
next_patch_ver = $(shell python versionbump.py --patch $(call git_tag_ver))
next_minor_ver = $(shell python versionbump.py --minor $(call git_tag_ver))
next_major_ver = $(shell python versionbump.py --major $(call git_tag_ver))
.PHONY: ${MODULE}/_version.py
${MODULE}/_version.py:
echo '__version__ = "$(call git_describe_ver)"' > $@
.PHONY: release
release: test lint mypy
git tag -a $(call next_patch_ver)
$(MAKE) ${MODULE}/_version.py
python setup.py check sdist upload # (legacy "upload" method)
# twine upload dist/* (preferred method)
git push origin master --tags
The release target always increments the 3rd version digit, but you can use the next_minor_ver or next_major_ver to increment the other digits. The commands rely on the versionbump.py script that is checked into the root of the repo
"""An auto-increment tool for version strings."""
import sys
import unittest
import click
from click.testing import CliRunner # type: ignore
__version__ = '0.1'
MIN_DIGITS = 2
MAX_DIGITS = 3
@click.command()
@click.argument('version')
@click.option('--major', 'bump_idx', flag_value=0, help='Increment major number.')
@click.option('--minor', 'bump_idx', flag_value=1, help='Increment minor number.')
@click.option('--patch', 'bump_idx', flag_value=2, default=True, help='Increment patch number.')
def cli(version: str, bump_idx: int) -> None:
"""Bumps a MAJOR.MINOR.PATCH version string at the specified index location or 'patch' digit. An
optional 'v' prefix is allowed and will be included in the output if found."""
prefix = version[0] if version[0].isalpha() else ''
digits = version.lower().lstrip('v').split('.')
if len(digits) > MAX_DIGITS:
click.secho('ERROR: Too many digits', fg='red', err=True)
sys.exit(1)
digits = (digits + ['0'] * MAX_DIGITS)[:MAX_DIGITS] # Extend total digits to max.
digits[bump_idx] = str(int(digits[bump_idx]) + 1) # Increment the desired digit.
# Zero rightmost digits after bump position.
for i in range(bump_idx + 1, MAX_DIGITS):
digits[i] = '0'
digits = digits[:max(MIN_DIGITS, bump_idx + 1)] # Trim rightmost digits.
click.echo(prefix + '.'.join(digits), nl=False)
if __name__ == '__main__':
cli() # pylint: disable=no-value-for-parameter
This does the heavy lifting how to process and increment the version number from git.
The my_module/_version.py file is imported into my_module/__init__.py. Put any static install config here that you want distributed with your module.
from ._version import __version__
__author__ = ''
__email__ = ''
The last step is to read the version info from the my_module module.
from setuptools import setup, find_packages
pkg_vars = {}
with open("{MODULE}/_version.py") as fp:
exec(fp.read(), pkg_vars)
setup(
version=pkg_vars['__version__'],
...
...
)
Of course, for all of this to work you'll have to have at least one version tag in your repo to start.
git tag -a v0.0.1
I use a JSON file in the package dir. This fits Zooko's requirements.
Inside pkg_dir/pkg_info.json:
{"version": "0.1.0"}
Inside setup.py:
from distutils.core import setup
import json
with open('pkg_dir/pkg_info.json') as fp:
_info = json.load(fp)
setup(
version=_info['version'],
...
)
Inside pkg_dir/__init__.py:
import json
from os.path import dirname
with open(dirname(__file__) + '/pkg_info.json') as fp:
_info = json.load(fp)
__version__ = _info['version']
I also put other information in pkg_info.json, like author. I
like to use JSON because I can automate management of metadata.
Also worth noting is that as well as __version__ being a semi-std. in python so is __version_info__ which is a tuple, in the simple cases you can just do something like:
__version__ = '1.2.3'
__version_info__ = tuple([ int(num) for num in __version__.split('.')])
...and you can get the __version__ string from a file, or whatever.
There doesn't seem to be a standard way to embed a version string in a python package. Most packages I've seen use some variant of your solution, i.e. eitner
Embed the version in setup.py and have setup.py generate a module (e.g. version.py) containing only version info, that's imported by your package, or
The reverse: put the version info in your package itself, and import that to set the version in setup.py
I also saw another style:
>>> django.VERSION
(1, 1, 0, 'final', 0)
arrow handles it in an interesting way.
Now (since 2e5031b)
In arrow/__init__.py:
__version__ = 'x.y.z'
In setup.py:
from arrow import __version__
setup(
name='arrow',
version=__version__,
# [...]
)
Before
In arrow/__init__.py:
__version__ = 'x.y.z'
VERSION = __version__
In setup.py:
def grep(attrname):
pattern = r"{0}\W*=\W*'([^']+)'".format(attrname)
strval, = re.findall(pattern, file_text)
return strval
file_text = read(fpath('arrow/__init__.py'))
setup(
name='arrow',
version=grep('__version__'),
# [...]
)
setuptools and pbrThere is not a standard way, but the standard way to manage your packages is setuptools.
The best solution I've found overall for managing version is to use setuptools with the pbr extension. This is now my standard way of managing version.
PBR moves most metadata out of the setup.py tools and into a setup.cfg file that is then used as a source for most metadata, which can include version. This allows the metadata to be packaged into an executable using something like pyinstaller if needed (if so, you will probably need this info), and separates the metadata from the other package management/setup scripts.
When using Git for VCS/SCM, this setup is even better, as it will pull in a lot of the metadata from Git so that your repo can be your primary source of truth for some of the metadata, including version, authors, changelogs, etc.
setup.py and a setup.cfg file with the metadata.As PBR will pull version, author, changelog and other info directly from your git repo, so some of the metadata in setup.cfg can be left out and auto generated whenever a distribution is created for your package (using setup.py)
setuptools will pull the latest info in real-time using setup.py:
python setup.py --version
This will pull the latest version either from the setup.cfg file, or from the git repo, based on the latest commit that was made and tags that exist in the repo. This command doesn't update the version in a distribution though.
When you create a distribution with setup.py (i.e. py setup.py sdist, for example), then all the current info will be extracted and stored in the distribution. This essentially runs the setup.py --version command and then stores that version info into the package.egg-info folder in a set of files that store distribution metadata.
Note on process to update version meta-data:
If you are not using pbr to pull version data from git, then just update your setup.cfg directly with new version info (easy enough, but make sure this is a standard part of your release process).
If you are using git, and you don't need to create a source or binary distribution (using
python setup.py sdistor one of thepython setup.py bdist_xxxcommands) the simplest way to update the git repo info into your<mypackage>.egg-infometadata folder is to just run thepython setup.py installcommand. This will run all the PBR functions related to pulling metadata from the git repo and update your local.egg-infofolder, install script executables for any entry-points you have defined, and other functions you can see from the output when you run this command.Note that the
.egg-infofolder is generally excluded from being stored in the git repo itself in standard Python.gitignorefiles (such as from Gitignore.IO), as it can be generated from your source. If it is excluded, make sure you have a standard "release process" to get the metadata updated locally before release, and any package you upload to PyPi.org or otherwise distribute must include this data to have the correct version. If you want the Git repo to contain this info, you can exclude specific files from being ignored (i.e. add!*.egg-info/PKG_INFOto.gitignore)
You can access the metadata from the current build within Python scripts in the package itself. For version, for example, there are several ways to do this I have found so far:
## This one is a new built-in as of Python 3.8.0 should become the standard
from importlib-metadata import version
v0 = version("mypackage")
print('v0 {}'.format(v0))
## I don't like this one because the version method is hidden
import pkg_resources # part of setuptools
v1 = pkg_resources.require("mypackage")[0].version
print('v1 {}'.format(v1))
# Probably best for pre v3.8.0 - the output without .version is just a longer string with
# both the package name, a space, and the version string
import pkg_resources # part of setuptools
v2 = pkg_resources.get_distribution('mypackage').version
print('v2 {}'.format(v2))
## This one seems to be slower, and with pyinstaller makes the exe a lot bigger
from pbr.version import VersionInfo
v3 = VersionInfo('mypackage').release_string()
print('v3 {}'.format(v3))
You can put one of these directly in your __init__.py for the package to extract the version info as follows, similar to some other answers:
__all__ = (
'__version__',
'my_package_name'
)
import pkg_resources # part of setuptools
__version__ = pkg_resources.get_distribution("mypackage").version
For what it's worth, if you're using NumPy distutils, numpy.distutils.misc_util.Configuration has a make_svn_version_py() method that embeds the revision number inside package.__svn_version__ in the variable version .
version.py file only with __version__ = <VERSION> param in the file. In the setup.py file import the __version__ param and put it's value in the setup.py file like this:
version=__version__setup.py file with version=<CURRENT_VERSION> - the CURRENT_VERSION is hardcoded.Since we don't want to manually change the version in the file every time we create a new tag (ready to release a new package version), we can use the following..
I highly recommend bumpversion package. I've been using it for years to bump a version.
start by adding version=<VERSION> to your setup.py file if you don't have it already.
You should use a short script like this every time you bump a version:
bumpversion (patch|minor|major) - choose only one option
git push
git push --tags
Then add one file per repo called: .bumpversion.cfg:
[bumpversion]
current_version = <CURRENT_TAG>
commit = True
tag = True
tag_name = {new_version}
[bumpversion:file:<RELATIVE_PATH_TO_SETUP_FILE>]
Note:
__version__ parameter under version.py file like it was suggested in other posts and update the bumpversion file like this:
[bumpversion:file:<RELATIVE_PATH_TO_VERSION_FILE>]git commit or git reset everything in your repo, otherwise you'll get a dirty repo error. If you use CVS (or RCS) and want a quick solution, you can use:
__version__ = "$Revision: 1.1 $"[11:-2]
__version_info__ = tuple([int(s) for s in __version__.split(".")])
(Of course, the revision number will be substituted for you by CVS.)
This gives you a print-friendly version and a version info that you can use to check that the module you are importing has at least the expected version:
import my_module
assert my_module.__version_info__ >= (1, 1)
