diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 778b93c1fe2..d9b9a06413c 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -342,6 +342,29 @@ in modules // {
     };
   };
 
+  aiohttp = buildPythonPackage rec {
+    name = "aiohttp-${version}";
+    version = "0.19.0";
+
+    src = pkgs.fetchurl {
+      url = "https://pypi.python.org/packages/source/a/aiohttp/${name}.tar.gz";
+      sha256 = "9bfb173baec179431a1c8f3566185e8ebbd1517cf4450217087d79e26e44c287";
+    };
+
+    disabled = pythonOlder "3.4";
+
+    doCheck = false; # Too many tests fail.
+
+    buildInputs = with self; [ pytest gunicorn pytest-raisesregexp ];
+    propagatedBuildInputs = with self; [ chardet ];
+
+    meta = {
+      description = "http client/server for asyncio";
+      license = with licenses; [ asl20 ];
+      homepage = https://github.com/KeepSafe/aiohttp/;
+    };
+  };
+
   alabaster = buildPythonPackage rec {
     name = "alabaster-0.7.3";
 
@@ -3354,6 +3377,30 @@ in modules // {
      };
   };
 
+  pytest-raisesregexp = buildPythonPackage rec {
+    name = "pytest-raisesregexp-${version}";
+    version = "2.0";
+
+    src = pkgs.fetchurl {
+      url = "https://pypi.python.org/packages/source/p/pytest-raisesregexp/${name}.tar.gz";
+      sha256 = "0fde8aac1a54f9b56e5f9c61fda76727542ed24968c27c6e3688c6f1885f1e61";
+    };
+
+    buildInputs = with self; [ py pytest ];
+
+    # https://github.com/kissgyorgy/pytest-raisesregexp/pull/3
+    prePatch = ''
+      sed -i '3i\import io' setup.py
+      substituteInPlace setup.py --replace "long_description=open('README.rst').read()," "long_description=io.open('README.rst', encoding='utf-8').read(),"
+    '';
+
+    meta = {
+      description = "Simple pytest plugin to look for regex in Exceptions";
+      homepage = https://github.com/Walkman/pytest_raisesregexp;
+      license = with licenses; [ mit ];
+    };
+  };
+
   pytestrunner = buildPythonPackage rec {
     version = "2.6.2";
     name = "pytest-runner-${version}";