- update to 20.0.21:
- Fix virtualenv fails sometimes when run concurrently, ``--clear-app-data`` conflicts with :option:`clear` flag when
abbreviation is turned on. To bypass this while allowing abbreviated flags on the command line we had to move it to
:option:`reset-app-data` - by :user:`gaborbernat`. (`#1824 `_)
- Fix download fails with python 3.4 - by :user:`gaborbernat`. (`#1809 `_)
- Fixes older CPython2 versions use ``_get_makefile_filename`` instead of ``get_makefile_filename`` on ``sysconfig`` - by :user:`ianw`. (`#1810 `_)
- Fix download is ``True`` by default - by :user:`gaborbernat`. (`#1813 `_)
- Fail ``app-data`` seed operation when wheel download fails and better error message - by :user:`gaborbernat`. (`#1814 `_)
- Fix generating a Python 2 environment from Python 3 creates invalid python activator - by :user:`gaborbernat`. (`#1776 `_)
- Fix pinning seed packages via ``app-data`` seeder raised ``Invalid Requirement`` - by :user:`gaborbernat`. (`#1779 `_)
- Do not stop interpreter discovery if we fail to find the system interpreter for a executable during discovery
- by :user:`gaborbernat`. (`#1781 `_)
- On CPython2 POSIX platforms ensure ``syconfig.get_makefile_filename`` exists within the virtual environment (this is used by some c-extension based libraries - e.g. numpy - for building) - by :user:`gaborbernat`. (`#1783 `_)
- Better handling of options :option:`copies` and :option:`symlinks`. Introduce priority of where the option is set
to follow the order: CLI, env var, file, hardcoded. If both set at same level prefers copy over symlink. - by
:user:`gaborbernat`. (`#1784 `_)
- Upgrade pip for Python ``2.7`` and ``3.5+`` from ``20.0.2`` to ``20.1`` - by :user:`gaborbernat`. (`#1793 `_)
- Fix CPython is not discovered from Windows registry, and discover pythons from Windows registry in decreasing order
by version - by :user:`gaborbernat`. (`#1796 `_)
- Fix symlink detection for creators - by :user:`asottile` (`#1803 `_)
- Importing setuptools before cli_run could cause our python information query to fail due to setuptools patching
``distutils.dist.Distribution`` - by :user:`gaborbernat`. (`#1771 `_)