pythonPackages.pytestpep8: Move to own file and add version

pkgs/development/python-modules/pytest-pep8/default.nix

@@ -0,0 +1,28 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, pytest, pytestcache, pep8 }:
+
+buildPythonPackage rec {
+  pname = "pytest-pep8";
+  version = "1.0.6";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "06032agzhw1i9d9qlhfblnl3dw5hcyxhagn7b120zhrszbjzfbh3";
+  };
+
+  buildInputs = [ pytest ];
+  propagatedBuildInputs = [ pytestcache pep8 ];
+
+  checkPhase = ''
+    py.test
+  '';
+
+  # Fails
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    license = licenses.mit;
+    homepage = https://pypi.python.org/pypi/pytest-pep8;
+    description = "pytest plugin to check PEP8 requirements";
+  };
+}

pkgs/top-level/python-packages.nix

@@ -1940,29 +1940,7 @@ in {
 
   pytest-warnings = callPackage ../development/python-modules/pytest-warnings { };
 
-  pytestpep8 = buildPythonPackage rec {
+  pytestpep8 = callPackage ../development/python-modules/pytest-pep8 { };
-    name = "pytest-pep8";
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/p/pytest-pep8/pytest-pep8-1.0.6.tar.gz";
-      sha256 = "06032agzhw1i9d9qlhfblnl3dw5hcyxhagn7b120zhrszbjzfbh3";
-    };
-
-    buildInputs = with self; [ pytest ];
-    propagatedBuildInputs = with self; [ pytestcache pep8 ];
-
-    checkPhase = ''
-      py.test
-    '';
-
-    # Fails
-    doCheck = false;
-
-    meta = {
-      license = licenses.mit;
-      homepage = "https://pypi.python.org/pypi/pytest-pep8";
-      description = "pytest plugin to check PEP8 requirements";
-    };
-  };
 
   pytest-pep257 = callPackage ../development/python-modules/pytest-pep257 { };