```
builder for '/nix/store/5hqb6vylvzjj92db46wrzd3mp56vv1ms-python2.7-unittest-xml-reporting-3.0.2.drv' failed with exit code 1; last 10 log lines:
no configure script, doing nothing
building
Executing setuptoolsBuildPhase
Traceback (most recent call last):
File "nix_run_setup", line 8, in <module>
exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\\r\\n', '\\n'), __file__, 'exec'))
File "setup.py", line 21, in <module>
raise RuntimeError('This version requires Python 3.5+') # pragma: no cover
RuntimeError: This version requires Python 3.5+
builder for '/nix/store/5hqb6vylvzjj92db46wrzd3mp56vv1ms-python2.7-unittest-xml-reporting-3.0.2.drv' failed with exi
```
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`.
