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[pyvcechecker <1960887@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Currently, the keyword argument "python_requires" of "setup()" is not set, and thus it is assumed that this distribution is compatible with all Python versions. 
However, I found it is not compatible with "Python <3.6". My local Python version is 3.5, and I encounter the following error when executing "pip install horizon"

------
Collecting horizon
  Downloading horizon-21.0.0-py3-none-any.whl (5.1 MB)
     |████████████████████████████████| 5.1 MB 465 kB/s 
Collecting python-keystoneclient>=3.22.0
  Downloading python_keystoneclient-3.22.0-py2.py3-none-any.whl (397 kB)
     |████████████████████████████████| 397 kB 444 kB/s 
Collecting oslo.upgradecheck>=0.1.1
  Downloading oslo.upgradecheck-0.4.0-py2.py3-none-any.whl (11 kB)
ERROR: Could not find a version that satisfies the requirement oslo.i18n>=5.0.1 (from horizon) (from versions: 0.1.0, 0.2.0, 0.3.0, 0.4.0, 1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.3.1, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.4.0, 2.5.0, 2.6.0, 2.7.0, 3.0.0, 3.1.0, 3.2.0, 3.3.0, 3.4.0, 3.5.0, 3.6.0, 3.7.0, 3.8.0, 3.9.0, 3.10.0, 3.11.0, 3.12.0, 3.13.0, 3.14.0, 3.15.0, 3.15.1, 3.15.2, 3.15.3, 3.16.0, 3.17.0, 3.17.1, 3.17.2, 3.18.0, 3.19.0, 3.20.0, 3.21.0, 3.22.0, 3.22.1, 3.23.0, 3.23.1, 3.24.0, 3.25.0, 3.25.1)
ERROR: No matching distribution found for oslo.i18n>=5.0.1 (from horizon)
------

I found that horizon 21.0.0 depends on oslo.i18n>=5.0.1, but
oslo.i18n>=5.0.1 requires Python>=3.6, which results in installation
failure of horizon in Python 3.5.

Way to fix:
modify setup() in setup.py, add "python_requires" keyword argument:

---
setup(…
     python_requires=">=3.6"
     …)
---
Thanks for your attention.
Best regrads,
PyVCEchecker

** Affects: horizon
     Importance: Undecided
         Status: New


** Tags: documentation

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https://bugs.launchpad.net/bugs/1960887

Title:
  “python_requires” should be set with “>=3.6”, as horizon 21.0.0 is not
  compatible with all Python versions.

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  Currently, the keyword argument "python_requires" of "setup()" is not set, and thus it is assumed that this distribution is compatible with all Python versions. 
  However, I found it is not compatible with "Python <3.6". My local Python version is 3.5, and I encounter the following error when executing "pip install horizon"

  ------
  Collecting horizon
    Downloading horizon-21.0.0-py3-none-any.whl (5.1 MB)
       |████████████████████████████████| 5.1 MB 465 kB/s 
  Collecting python-keystoneclient>=3.22.0
    Downloading python_keystoneclient-3.22.0-py2.py3-none-any.whl (397 kB)
       |████████████████████████████████| 397 kB 444 kB/s 
  Collecting oslo.upgradecheck>=0.1.1
    Downloading oslo.upgradecheck-0.4.0-py2.py3-none-any.whl (11 kB)
  ERROR: Could not find a version that satisfies the requirement oslo.i18n>=5.0.1 (from horizon) (from versions: 0.1.0, 0.2.0, 0.3.0, 0.4.0, 1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.3.1, 1.4.0, 1.5.0, 1.6.0, 1.7.0, 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.4.0, 2.5.0, 2.6.0, 2.7.0, 3.0.0, 3.1.0, 3.2.0, 3.3.0, 3.4.0, 3.5.0, 3.6.0, 3.7.0, 3.8.0, 3.9.0, 3.10.0, 3.11.0, 3.12.0, 3.13.0, 3.14.0, 3.15.0, 3.15.1, 3.15.2, 3.15.3, 3.16.0, 3.17.0, 3.17.1, 3.17.2, 3.18.0, 3.19.0, 3.20.0, 3.21.0, 3.22.0, 3.22.1, 3.23.0, 3.23.1, 3.24.0, 3.25.0, 3.25.1)
  ERROR: No matching distribution found for oslo.i18n>=5.0.1 (from horizon)
  ------

  I found that horizon 21.0.0 depends on oslo.i18n>=5.0.1, but
  oslo.i18n>=5.0.1 requires Python>=3.6, which results in installation
  failure of horizon in Python 3.5.

  Way to fix:
  modify setup() in setup.py, add "python_requires" keyword argument:

  ---
  setup(…
       python_requires=">=3.6"
       …)
  ---
  Thanks for your attention.
  Best regrads,
  PyVCEchecker

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