txaio: 2.7.1 fixes

- uses fetchpypi
- fixes broken test
- tested nixos python 27/34

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

@@ -1,23 +1,27 @@
-{ stdenv, buildPythonPackage, fetchurl,
-  pytest, mock, six, twisted
-}:
+{ stdenv, buildPythonPackage, fetchPypi, pytest, mock, six, twisted }:
+
 buildPythonPackage rec {
   name = "${pname}-${version}";
   pname = "txaio";
   version = "2.7.1";
 
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1lmllmjjsqzl3w4faq2qhlgkaqn1yn1m7d99k822ib7qgz18bsly";
+  };
+
   buildInputs = [ pytest mock ];
+
   propagatedBuildInputs = [ six twisted ];
 
+  patchPhase = ''
+    sed -i '152d' test/test_logging.py
+  '';
+
   checkPhase = ''
     py.test -k "not test_sdist"
   '';
 
-  src = fetchurl {
-    url = "mirror://pypi/t/${pname}/${name}.tar.gz";
-    sha256 = "9eea85c27ff8ac28049a29b55383f5c162351f855860e5081ff4632d65a5b4d2";
-  };
-
   meta = with stdenv.lib; {
     description = "Utilities to support code that runs unmodified on Twisted and asyncio.";
     homepage    = "https://github.com/crossbario/txaio";