Updated version not detected

[dyve]

I notice that pur will not detect updates for black (https://github.com/ambv/black).

Reproduction of error:

• make new virtualenv
• pip install pur
• make new requirements.txt
• add black==18.6b4 to requirements.txt
• pip install -r requirements.txt
• confirm black==18.6b4 in output of pip freeze
• run pur -f -r requirements.txt
• pur will not update black version, confirm black==18.6b4 in requirements.txt
• run pip install -U black
• pip will find newer black version, at the time of writing black==18.9b0

[eLBati]

I noticed a similar behaviour with odoo modules.
I have a requirements.txt file with several lines, for example odoo12-addon-l10n-it-fatturapa==12.0.1.0.0.99.dev13
Even if a new version of the module is released https://pypi.org/project/odoo12-addon-l10n-it-fatturapa/#history
when I run pur -r requirements.txt its version is not updated

[alanhamlett]

By default, pur does not update packages to pre-release versions for stability reasons. To enable updates to pre-release versions, use --pre * like this:

pur -r requirements.txt --pre "*"

[eLBati]

@alanhamlett it does not work. Please create a requirements.tx with the following line
odoo12-addon-l10n-it-fatturapa-out==12.0.1.0.1.99.dev13
and run pur -r requirements.txt --pre "*"

[alanhamlett]

This call to Pip is returning an empty set of candidates for upgrading:

pip-update-requirements/pur/utils.py

Line 165 in 19d1f64

all_candidates = finder.find_all_candidates(req.name)

I've updated pip to the latest version (19.1.dev0) and it's still returning an empty set. The problem could be in how we setup PackageFinder:

pip-update-requirements/pur/__init__.py

Line 332 in 19d1f64

finder = PackageFinder(

[lancelote]

$ pur -r requirements.txt --pre "*"
Updated odoo12-addon-l10n-it-fatturapa-out: 12.0.1.0.1.99.dev13 -> 12.0.1.0.2.99.dev2

seems to be correct. @eLBati Do you get the different result?

P.S. odoo12-addon-l10n-it-fatturapa and odoo12-addon-l10n-it-fatturapa-out are two different packages.

[eLBati]

@lancelote

$ cat requirements.txt 
odoo12-addon-l10n-it-fatturapa-out==12.0.1.0.1.99.dev13
$ pur -r requirements.txt --pre "*"
All requirements up-to-date.
$ cat requirements.txt 
odoo12-addon-l10n-it-fatturapa-out==12.0.1.0.1.99.dev13
$ pur --version
pur, version 5.2.1
$ pip --version
pip 19.0.1 from /usr/local/lib/python2.7/dist-packages/pip (python 2.7)

[lancelote]

@eLBati Thanks, the difference was in Python version, it works with 3.7 but fails with 2.7.

Update after some debugging: maybe I am missing something again but odoo12-addon-l10n-it-fatturapa-out requires Python 3.

[lancelote]

@alanhamlett I guess the issue can be closed. odoo12-addon-l10n-it-fatturapa-out requires Python 3 and no available updates for Python 2 is expected.

[alanhamlett]

Let's leave this open, since it's not related to that single package and we should support this requirement spec in general.