pythonPackages: remove name attribute`

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`.

pkgs/development/python-modules/bcrypt/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildPythonPackage, isPyPy, fetchurl
+{ stdenv, buildPythonPackage, isPyPy, fetchPypi
 , cffi, pycparser, mock, pytest, py, six }:
 
 with stdenv.lib;
@@ -6,10 +6,9 @@ with stdenv.lib;
 buildPythonPackage rec {
   version = "3.1.4";
   pname = "bcrypt";
-  name = "${pname}-${version}";
 
-  src = fetchurl {
-    url = "mirror://pypi/b/bcrypt/${name}.tar.gz";
+  src = fetchPypi {
+    inherit pname version;
     sha256 = "67ed1a374c9155ec0840214ce804616de49c3df9c5bc66740687c1c9b1cd9e8d";
   };
   buildInputs = [ pycparser mock pytest py ];