This reverts commit dc4eb2fc5e. It was
added in a large PR (#71893) by @fridh, where he already predicted some of
the changes would have to be reverted. This is an obvious one, it breaks
python 2.7 compatibility, as that needs 5.x of jupyter_console.
The `buildPython*` function computes name from `pname` and `version`.
This change removes `name` attribute from all expressions in
`pkgs/development/python-modules`.
While at it, some other minor changes were made as well, such as
replacing `fetchurl` calls with `fetchPypi`.
