urwid: move into separate file, use fetchPypi instead of fetchurl

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

@@ -0,0 +1,20 @@
+{ stdenv, buildPythonPackage, fetchPypi }:
+
+buildPythonPackage (rec {
+  pname = "urwid";
+  version = "1.3.1";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "18cnd1wdjcas08x5qwa5ayw6jsfcn33w4d9f7q3s29fy6qzc1kng";
+  };
+
+  meta = with stdenv.lib; {
+    description = "A full-featured console (xterm et al.) user interface library";
+    homepage = http://excess.org/urwid;
+    repositories.git = git://github.com/wardi/urwid.git;
+    license = licenses.lgpl21;
+    maintainers = with maintainers; [ garbas ];
+  };
+})

pkgs/top-level/python-packages.nix

@@ -21977,25 +21977,7 @@ in {
 
   urlgrabber = callPackage ../development/python-modules/urlgrabber {};
 
-  urwid = buildPythonPackage (rec {
-    name = "urwid-1.3.1";
-
-    # multiple:  NameError: name 'evl' is not defined
-    doCheck = false;
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/u/urwid/${name}.tar.gz";
-      sha256 = "18cnd1wdjcas08x5qwa5ayw6jsfcn33w4d9f7q3s29fy6qzc1kng";
-    };
-
-    meta = {
-      description = "A full-featured console (xterm et al.) user interface library";
-      homepage = http://excess.org/urwid;
-      repositories.git = git://github.com/wardi/urwid.git;
-      license = licenses.lgpl21;
-      maintainers = with maintainers; [ garbas ];
-    };
-  });
+  urwid = callPackage ../development/python-modules/urwid {};
 
   urwidtrees = buildPythonPackage rec {
     name = "urwidtrees-${rev}";