diff --git a/pkgs/development/python-modules/aiodns/default.nix b/pkgs/development/python-modules/aiodns/default.nix
index 0a91efe7dde4..05e17ec12f43 100644
--- a/pkgs/development/python-modules/aiodns/default.nix
+++ b/pkgs/development/python-modules/aiodns/default.nix
@@ -1,5 +1,5 @@
 { lib, buildPythonPackage, fetchPypi, pythonOlder
-, isPy27, isPyPy, python, pycares, typing
+, isPy27, isPyPy, python, pycares, typing ? null
 , trollius ? null
 }:
 
diff --git a/pkgs/development/python-modules/aiohttp-cors/default.nix b/pkgs/development/python-modules/aiohttp-cors/default.nix
index 00198cd27cff..fc5dc87f4ef2 100644
--- a/pkgs/development/python-modules/aiohttp-cors/default.nix
+++ b/pkgs/development/python-modules/aiohttp-cors/default.nix
@@ -1,5 +1,5 @@
 { lib, buildPythonPackage, fetchPypi, pythonOlder
-, typing, aiohttp
+, typing ? null, aiohttp
 }:
 
 buildPythonPackage rec {
diff --git a/pkgs/development/python-modules/altair/default.nix b/pkgs/development/python-modules/altair/default.nix
index 99ee559da6b9..6e686d9fc907 100644
--- a/pkgs/development/python-modules/altair/default.nix
+++ b/pkgs/development/python-modules/altair/default.nix
@@ -12,7 +12,7 @@
 , six
 , sphinx
 , toolz
-, typing
+, typing ? null
 , vega_datasets
 }:
 
diff --git a/pkgs/development/python-modules/build/default.nix b/pkgs/development/python-modules/build/default.nix
index b5dce09d516f..639dc53babf2 100644
--- a/pkgs/development/python-modules/build/default.nix
+++ b/pkgs/development/python-modules/build/default.nix
@@ -12,7 +12,7 @@
 , pytestCheckHook
 , pythonOlder
 , toml
-, typing
+, typing ? null
 }:
 
 buildPythonPackage rec {
diff --git a/pkgs/development/python-modules/can/default.nix b/pkgs/development/python-modules/can/default.nix
index ea49c9b4a777..255a100ec688 100644
--- a/pkgs/development/python-modules/can/default.nix
+++ b/pkgs/development/python-modules/can/default.nix
@@ -5,7 +5,7 @@
 , isPy27
 , aenum
 , wrapt
-, typing
+, typing ? null
 , pyserial
 , nose
 , mock
diff --git a/pkgs/development/python-modules/canmatrix/default.nix b/pkgs/development/python-modules/canmatrix/default.nix
index 8ffacc1a99de..d36f6805cc3f 100644
--- a/pkgs/development/python-modules/canmatrix/default.nix
+++ b/pkgs/development/python-modules/canmatrix/default.nix
@@ -7,7 +7,7 @@
 , click
 , future
 , pathlib2
-, typing
+, typing ? null
 , lxml
 , xlwt
 , xlrd
diff --git a/pkgs/development/python-modules/chalice/default.nix b/pkgs/development/python-modules/chalice/default.nix
index 54ca6e35dc03..e99f321df37f 100644
--- a/pkgs/development/python-modules/chalice/default.nix
+++ b/pkgs/development/python-modules/chalice/default.nix
@@ -15,7 +15,7 @@
 , pyyaml
 , setuptools
 , six
-, typing
+, typing ? null
 , watchdog
 , wheel
 }:
diff --git a/pkgs/development/python-modules/class-registry/default.nix b/pkgs/development/python-modules/class-registry/default.nix
index 93c41cadea6e..3faf07966d09 100644
--- a/pkgs/development/python-modules/class-registry/default.nix
+++ b/pkgs/development/python-modules/class-registry/default.nix
@@ -4,7 +4,7 @@
   lib,
   nose,
   six,
-  typing,
+  typing ? null,
   isPy27,
 }:
 
diff --git a/pkgs/development/python-modules/clikit/default.nix b/pkgs/development/python-modules/clikit/default.nix
index 7b07b0945919..1f6be754be19 100644
--- a/pkgs/development/python-modules/clikit/default.nix
+++ b/pkgs/development/python-modules/clikit/default.nix
@@ -1,6 +1,6 @@
 { lib, buildPythonPackage, fetchPypi
 , isPy27, pythonAtLeast
-, pylev, pastel, typing, enum34, crashtest }:
+, pylev, pastel, typing ? null, enum34 ? null, crashtest }:
 
 buildPythonPackage rec {
   pname = "clikit";
diff --git a/pkgs/development/python-modules/connexion/default.nix b/pkgs/development/python-modules/connexion/default.nix
index 6b212be3bb7b..25925f56069a 100644
--- a/pkgs/development/python-modules/connexion/default.nix
+++ b/pkgs/development/python-modules/connexion/default.nix
@@ -26,7 +26,7 @@
 , six
 , swagger-ui-bundle
 , testfixtures
-, typing
+, typing ? null
 , ujson
 }:
 
diff --git a/pkgs/development/python-modules/curtsies/default.nix b/pkgs/development/python-modules/curtsies/default.nix
index 62f1435df30e..dc32bcdf74c9 100644
--- a/pkgs/development/python-modules/curtsies/default.nix
+++ b/pkgs/development/python-modules/curtsies/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchPypi, fetchpatch, pythonOlder, blessings, mock, nose, pyte, wcwidth, typing }:
+{ lib, buildPythonPackage, fetchPypi, fetchpatch, pythonOlder, blessings, mock, nose, pyte, wcwidth, typing ? null}:
 
 buildPythonPackage rec {
   pname = "curtsies";
diff --git a/pkgs/development/python-modules/datadog/default.nix b/pkgs/development/python-modules/datadog/default.nix
index 9d81e9f72eae..270a5b4e9d86 100644
--- a/pkgs/development/python-modules/datadog/default.nix
+++ b/pkgs/development/python-modules/datadog/default.nix
@@ -4,7 +4,7 @@
 , pythonOlder
 , decorator
 , requests
-, typing
+, typing ? null
 , configparser
 , click
 , freezegun
diff --git a/pkgs/development/python-modules/django-extensions/default.nix b/pkgs/development/python-modules/django-extensions/default.nix
index 9bd72965cf8b..3e7a1163b96f 100644
--- a/pkgs/development/python-modules/django-extensions/default.nix
+++ b/pkgs/development/python-modules/django-extensions/default.nix
@@ -11,7 +11,7 @@
 , shortuuid
 , six
 , tox
-, typing
+, typing ? null
 , vobject
 , werkzeug
 }:
diff --git a/pkgs/development/python-modules/eth-hash/default.nix b/pkgs/development/python-modules/eth-hash/default.nix
index 26264444eeec..0f3f5f1a6452 100644
--- a/pkgs/development/python-modules/eth-hash/default.nix
+++ b/pkgs/development/python-modules/eth-hash/default.nix
@@ -1,5 +1,7 @@
-{ lib, fetchPypi, buildPythonPackage, pythonOlder, pytest, pysha3, pycrypto,
-  pycryptodome }:
+{ lib, fetchPypi, buildPythonPackage, pythonOlder, pytest, pysha3, pycrypto
+, pycryptodome
+, eth-utils
+}:
 
 buildPythonPackage rec {
   pname = "eth-hash";
@@ -12,7 +14,12 @@ buildPythonPackage rec {
 
   checkInputs = [ pytest ];
 
-  propagatedBuildInputs = [ pysha3 pycrypto pycryptodome ];
+  propagatedBuildInputs = [
+    eth-utils
+    pysha3
+    pycrypto
+    pycryptodome
+  ];
 
   # setuptools-markdown uses pypandoc which is broken at the moment
   preConfigure = ''
diff --git a/pkgs/development/python-modules/flake8/default.nix b/pkgs/development/python-modules/flake8/default.nix
index cf2ce36028ed..7c81967d070e 100644
--- a/pkgs/development/python-modules/flake8/default.nix
+++ b/pkgs/development/python-modules/flake8/default.nix
@@ -1,6 +1,6 @@
 { lib, buildPythonPackage, fetchPypi, pythonOlder
 , mock, pytest, pytestrunner
-, configparser, enum34, mccabe, pycodestyle, pyflakes, functools32, typing, importlib-metadata
+, configparser, enum34, mccabe, pycodestyle, pyflakes, functools32, typing ? null, importlib-metadata
 }:
 
 buildPythonPackage rec {
diff --git a/pkgs/development/python-modules/fs/default.nix b/pkgs/development/python-modules/fs/default.nix
index 5158a553bfb8..c14b169bea95 100644
--- a/pkgs/development/python-modules/fs/default.nix
+++ b/pkgs/development/python-modules/fs/default.nix
@@ -4,9 +4,9 @@
 , fetchPypi
 , six
 , appdirs
-, scandir
+, scandir ? null
 , backports_os ? null
-, typing
+, typing ? null
 , pytz
 , enum34
 , pyftpdlib
diff --git a/pkgs/development/python-modules/gentools/default.nix b/pkgs/development/python-modules/gentools/default.nix
index 129eaae340a1..14e1fc1c6098 100644
--- a/pkgs/development/python-modules/gentools/default.nix
+++ b/pkgs/development/python-modules/gentools/default.nix
@@ -1,5 +1,5 @@
 { buildPythonPackage, lib, fetchFromGitHub, pytest
-, typing, funcsigs, pythonOlder
+, typing ? null, funcsigs ? null, pythonOlder
 }:
 
 buildPythonPackage rec {
diff --git a/pkgs/development/python-modules/hyperlink/default.nix b/pkgs/development/python-modules/hyperlink/default.nix
index 6cb69a14e723..ad56de86782b 100644
--- a/pkgs/development/python-modules/hyperlink/default.nix
+++ b/pkgs/development/python-modules/hyperlink/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchPypi, isPy27, idna, typing }:
+{ lib, buildPythonPackage, fetchPypi, isPy27, idna, typing ? null }:
 
 buildPythonPackage rec {
   pname = "hyperlink";
diff --git a/pkgs/development/python-modules/importlib-resources/default.nix b/pkgs/development/python-modules/importlib-resources/default.nix
index 7820342084f1..cd8fec1e54e0 100644
--- a/pkgs/development/python-modules/importlib-resources/default.nix
+++ b/pkgs/development/python-modules/importlib-resources/default.nix
@@ -4,8 +4,8 @@
 , setuptools_scm
 , toml
 , importlib-metadata
-, typing
-, singledispatch
+, typing ? null
+, singledispatch ? null
 , pythonOlder
 , python
 }:
diff --git a/pkgs/development/python-modules/poetry-core/default.nix b/pkgs/development/python-modules/poetry-core/default.nix
index 80c4b5acfe8c..cc1724024add 100644
--- a/pkgs/development/python-modules/poetry-core/default.nix
+++ b/pkgs/development/python-modules/poetry-core/default.nix
@@ -7,7 +7,7 @@
 , pytest-mock
 , pytestCheckHook
 , tomlkit
-, typing
+, typing ? null
 , virtualenv
 }:
 
diff --git a/pkgs/development/python-modules/sphinx/default.nix b/pkgs/development/python-modules/sphinx/default.nix
index 9ce0015cdf86..1c5cc29f4146 100644
--- a/pkgs/development/python-modules/sphinx/default.nix
+++ b/pkgs/development/python-modules/sphinx/default.nix
@@ -26,7 +26,7 @@
 , sphinxcontrib-qthelp
 , sphinxcontrib-serializinghtml
 , sphinxcontrib-websupport
-, typing
+, typing ? null
 , setuptools
 , packaging
 }:
diff --git a/pkgs/development/python-modules/tomlkit/default.nix b/pkgs/development/python-modules/tomlkit/default.nix
index 27f952386f12..cabe2ebcd5e3 100644
--- a/pkgs/development/python-modules/tomlkit/default.nix
+++ b/pkgs/development/python-modules/tomlkit/default.nix
@@ -1,5 +1,5 @@
 { lib, buildPythonPackage, fetchPypi, isPy27
-, enum34, functools32, typing
+, enum34, functools32, typing ? null
 }:
 
 buildPythonPackage rec {
diff --git a/pkgs/development/python-modules/typing/default.nix b/pkgs/development/python-modules/typing/default.nix
index 0d5c2119921a..823ee2af29e0 100644
--- a/pkgs/development/python-modules/typing/default.nix
+++ b/pkgs/development/python-modules/typing/default.nix
@@ -1,4 +1,5 @@
-{ lib, buildPythonPackage, fetchPypi, pythonOlder, isPy3k, isPyPy, python }:
+{ lib, buildPythonPackage, fetchPypi, pythonOlder, isPy3k, isPyPy, python
+, pythonAtLeast }:
 
 let
   testDir = if isPy3k then "src" else "python2";
@@ -12,6 +13,8 @@ in buildPythonPackage rec {
     sha256 = "1187fb9c82fd670d10aa07bbb6cfcfe4bdda42d6fab8d5134f04e8c4d0b71cc9";
   };
 
+  disabled = pythonAtLeast "3.5";
+
   # Error for Python3.6: ImportError: cannot import name 'ann_module'
   # See https://github.com/python/typing/pull/280
   # Also, don't bother on PyPy: AssertionError: TypeError not raised
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index dd580c653eab..634ba5a64f04 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -7906,7 +7906,7 @@ in {
 
   typesystem = callPackage ../development/python-modules/typesystem { };
 
-  typing = callPackage ../development/python-modules/typing { };
+  typing = null;
 
   typing-extensions = callPackage ../development/python-modules/typing-extensions { };
 
diff --git a/pkgs/top-level/python2-packages.nix b/pkgs/top-level/python2-packages.nix
index fddf65eaae08..7538c485dc1c 100644
--- a/pkgs/top-level/python2-packages.nix
+++ b/pkgs/top-level/python2-packages.nix
@@ -599,6 +599,8 @@ with self; with super; {
 
   TurboCheetah = callPackage ../development/python-modules/TurboCheetah { };
 
+  typing = callPackage ../development/python-modules/typing { };
+
   ujson = callPackage ../development/python-modules/ujson/2.nix { };
 
   umemcache = callPackage ../development/python-modules/umemcache { };