python-versions.jinja

{# You use this file by including it via jinja like:

    {%- import 'python-versions.jinja' as py -%} 

Then pass the python_versions list into the various macros like so: 

  {{ py.min(python_versions) }} 

This template creates no output, but does allow you to transform python_versions answer into a 
number of helpful values for when you need a single python version. 

Note that the import syntax and access MUST BE in the form above. Copier has problems processing import lines
that are any more complex when they occur in files who's paths are also jinja templated. #}


{# This gives a middle python version from a potentially long list of versions 
For even-length lists we prefer the older of the two middle values. 
   ["3.9","3.10","3.11","3.12"] -> "3.10" 
For odd-length lists we prefer the middle value 
   ["3.9","3.10","3.11"] -> "3.10"        #}
{% macro pref(python_versions) -%}
{%- set n = python_versions | length -%}
{{ python_versions[((n+1)//2 - 1)] }}
{%- endmacro -%}

{# These give the minimum and maximum python versions supported #}
{% macro min(python_versions) -%}
{%- set n = python_versions | length -%}
{{ python_versions[0] }}
{%- endmacro -%}

{% macro max(python_versions) -%}
{%- set n = python_versions | length -%}
{{ python_versions[n-1] }}
{%- endmacro -%}