[how to install 0.5.2 with python2.7?]

[Uwe Brauer]

   > Hi Uwe,
   > On Fri, Aug 14, 2020, 17:35 Uwe Brauer <oub at mat.ucm.es> wrote:


   > Our docs on readthedocs do not currently retain documentation for obsolete
   > versions. I'm not sure if this is really good practice, but today it's like
   > that.

   > To get documentation for your chosen version, please see the 'docs'
   > directory in the kallithea source distribution and find the appropriate rst
   > file.

Here is what I did 


  hg up 0.5.2 (there is a corresponding tag)


I followed the instructions in docs/installation.rst


        cd kallithea
        virtualenv ../kallithea-venv
and this already failed!

File "/usr/bin/virtualenv", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2927, in <module>
    @_call_aside
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2952, in _initialize_master_working_set
    add_activation_listener(lambda dist: dist.activate())
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 956, in subscribe
    callback(dist)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2952, in <lambda>
    add_activation_listener(lambda dist: dist.activate())
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2515, in activate
    declare_namespace(pkg)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2097, in declare_namespace
    _handle_ns(packageName, path_item)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2047, in _handle_ns
    _rebuild_mod_path(path, packageName, module)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 2066, in _rebuild_mod_path
    orig_path.sort(key=position_in_sys_path)
AttributeError: '_NamespacePath' object has no attribute 'sort'

Why on earth he is using python3 is beyond me.

Ubuntu offers
python3-virtualenv
and 
virtualenv

So I presume that virtualenv is for 2.7

I am puzzled.

Uwe 
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