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/usr/share/python3/runtime.d/uwsgi-plugin-asyncio-python3.rtupdate is in uwsgi-plugin-asyncio-python3 2.0.15-10.2ubuntu2.

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The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

if [ "x$1" = "xrtupdate" ]; then
  # Transform new default Python runtime name from 'pythonX.Y' to 'pythonXY'.
  NEW_RTNAME_DOTLESS="$(echo "$3" | tr -d .)"

  # Flavors of Python interpreter which was available at packaging moment
  # (and for which appropriate asyncio_*_plugin.so was built).
  KNOWN_FLAVORS_DOTLESS="python36"

  DEFAULT_PLUGIN_ALTERNATIVE_PRIORITY=75
  ALT_PLUGIN_ALTERNATIVE_PRIORITY=35

  for maybe_new_defaultflavor_dotless in $KNOWN_FLAVORS_DOTLESS; do

    # Check if * runtime (where * is a new default Python
    # flavor) was available at packaging moment.
    #
    # If it wasn't available, there is no point in changing default alternative
    # (as appropriate asyncio_*_plugin.so wasn't built and packaged).
    if [ "x$NEW_RTNAME_DOTLESS" = "x$maybe_new_defaultflavor_dotless" ]
    then

      # Reset prorities of all packaged alternatives of
      # asyncio_python3_plugin.so to lower value.
      for flavor_dotless in $KNOWN_FLAVORS_DOTLESS; do
        update-alternatives --quiet \
          --install \
            /usr/lib/uwsgi/plugins/asyncio_python3_plugin.so \
            uwsgi-plugin-asyncio-python3 \
            /usr/lib/uwsgi/plugins/asyncio_${flavor_dotless}_plugin.so \
            $ALT_PLUGIN_ALTERNATIVE_PRIORITY
      done

      # Set higher priority for asyncio_*_plugin.so (where * is
      # a new default Python version).
      update-alternatives --quiet \
        --install \
          /usr/lib/uwsgi/plugins/asyncio_python3_plugin.so \
          uwsgi-plugin-asyncio-python3 \
          "/usr/lib/uwsgi/plugins/asyncio_${NEW_RTNAME_DOTLESS}_plugin.so" \
          $DEFAULT_PLUGIN_ALTERNATIVE_PRIORITY

      break # for maybe_new_defaultflavor_dotless ...
    fi
  done
fi