python2Packages.singledispatch: python 2 only

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

@@ -1,4 +1,4 @@
-{ fetchPypi, buildPythonPackage, lib, six, singledispatch, isPy3k
+{ fetchPypi, buildPythonPackage, lib, six, singledispatch ? null, isPy3k
 , click
 , joblib
 , regex

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

@@ -5,7 +5,7 @@
 # Python deps
 , logutils
 , Mako
-, singledispatch
+, singledispatch ? null
 , six
 , webtest
 # Test Inputs

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

@@ -1,5 +1,5 @@
 { lib, isPy3k, fetchFromGitHub, buildPythonPackage
-, six, enum34, pyasn1, cryptography, singledispatch
+, six, enum34, pyasn1, cryptography, singledispatch ? null
 , fetchPypi, pytestCheckHook }:
 
 buildPythonPackage rec {

pkgs/development/python-modules/tornado/4.nix

@@ -2,10 +2,10 @@
 , python
 , buildPythonPackage
 , fetchPypi
-, backports_abc
-, backports_ssl_match_hostname
-, certifi
-, singledispatch
+, backports_abc ? null
+, backports_ssl_match_hostname ? null
+, certifi ? null
+, singledispatch ? null
 , futures ? null
 , isPy27
 }:

pkgs/development/python-modules/tornado/5.nix

@@ -2,10 +2,10 @@
 , python
 , buildPythonPackage
 , fetchPypi
-, backports_abc
-, backports_ssl_match_hostname
-, certifi
-, singledispatch
+, backports_abc ? null
+, backports_ssl_match_hostname ? null
+, certifi ? null
+, singledispatch ? null
 , futures ? null
 , isPy27
 }:

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

@@ -3,7 +3,7 @@
 , fetchPypi
 , pytestrunner
 , setuptools_scm
-, singledispatch
+, singledispatch ? null
 , pytest
 , lib
 }:

pkgs/top-level/python-packages.nix

@@ -7145,8 +7145,6 @@ in {
 
   simpy = callPackage ../development/python-modules/simpy { };
 
-  singledispatch = callPackage ../development/python-modules/singledispatch { };
-
   signify = callPackage ../development/python-modules/signify { };
 
   sip = callPackage ../development/python-modules/sip { };

pkgs/top-level/python2-packages.nix

@@ -545,6 +545,8 @@ with self; with super; {
 
   simpleparse = callPackage ../development/python-modules/simpleparse { };
 
+  singledispatch = callPackage ../development/python-modules/singledispatch { };
+
   sipsimple = callPackage ../development/python-modules/sipsimple { };
 
   slowaes = callPackage ../development/python-modules/slowaes { };