From ed898bf0f408be6afc100ebdaf98db11908a7c26 Mon Sep 17 00:00:00 2001
From: "Wael M. Nasreddine" <wael.nasreddine@gmail.com>
Date: Thu, 8 Aug 2019 17:45:34 -0700
Subject: [PATCH 1/3] dask: disable the package for Python older than 3.5

---
 pkgs/development/python-modules/dask/default.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/python-modules/dask/default.nix b/pkgs/development/python-modules/dask/default.nix
index cd38c8f137c5..5ae749f93736 100644
--- a/pkgs/development/python-modules/dask/default.nix
+++ b/pkgs/development/python-modules/dask/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , fetchPypi
 , pytest
+, pythonOlder
 , cloudpickle
 , numpy
 , toolz
@@ -14,6 +15,8 @@ buildPythonPackage rec {
   pname = "dask";
   version = "1.2.2";
 
+  disabled = pythonOlder "3.5";
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "5e7876bae2a01b355d1969b73aeafa23310febd8c353163910b73e93dc7e492c";

From cfb84a0ee64a64c3ab3476c0ac3fc9e8174be666 Mon Sep 17 00:00:00 2001
From: "Wael M. Nasreddine" <wael.nasreddine@gmail.com>
Date: Thu, 8 Aug 2019 17:46:01 -0700
Subject: [PATCH 2/3] pythonPackages.fsspec: init at 0.4.1

---
 .../python-modules/fsspec/default.nix         | 26 +++++++++++++++++++
 pkgs/top-level/python-packages.nix            |  2 ++
 2 files changed, 28 insertions(+)
 create mode 100644 pkgs/development/python-modules/fsspec/default.nix

diff --git a/pkgs/development/python-modules/fsspec/default.nix b/pkgs/development/python-modules/fsspec/default.nix
new file mode 100644
index 000000000000..8f4b9cf8c890
--- /dev/null
+++ b/pkgs/development/python-modules/fsspec/default.nix
@@ -0,0 +1,26 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "fsspec";
+  version = "0.4.1";
+
+  disabled = pythonOlder "3.5";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0fvm1kdnnbf0pppv23mlfdqh220gcldmv72w2rdxp6ks1rcphzg3";
+  };
+
+  # no tests
+  doCheck = false;
+
+  meta = with lib; {
+    description = "A specification that python filesystems should adhere to.";
+    homepage = "https://github.com/intake/filesystem_spec";
+    license = licenses.bsd3;
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 6b89401cb958..a89c4bf837b8 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -579,6 +579,8 @@ in {
 
   filemagic = callPackage ../development/python-modules/filemagic { };
 
+  fsspec = callPackage ../development/python-modules/fsspec { };
+
   fuse = callPackage ../development/python-modules/fuse-python {
     inherit (pkgs) fuse pkgconfig;
   };

From c9d4a6963a3f4c41df7433b108c56771dc37efc5 Mon Sep 17 00:00:00 2001
From: Piero Cinquegrana <piero.cinquegrana@keeptruckin.com>
Date: Thu, 8 Aug 2019 14:09:40 -0700
Subject: [PATCH 3/3] pythonPackages.dask: 1.2.2 -> 2.2.0

---
 pkgs/development/python-modules/dask/default.nix | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/python-modules/dask/default.nix b/pkgs/development/python-modules/dask/default.nix
index 5ae749f93736..ba8c06f73f2e 100644
--- a/pkgs/development/python-modules/dask/default.nix
+++ b/pkgs/development/python-modules/dask/default.nix
@@ -1,6 +1,8 @@
 { lib
+, bokeh
 , buildPythonPackage
 , fetchPypi
+, fsspec
 , pytest
 , pythonOlder
 , cloudpickle
@@ -13,17 +15,18 @@
 
 buildPythonPackage rec {
   pname = "dask";
-  version = "1.2.2";
+  version = "2.2.0";
 
   disabled = pythonOlder "3.5";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "5e7876bae2a01b355d1969b73aeafa23310febd8c353163910b73e93dc7e492c";
+    sha256 = "0wkiqkckwy7fv6m86cs3m3g6jdikkkw84ki9hiwp60xpk5xngnf0";
   };
 
   checkInputs = [ pytest ];
-  propagatedBuildInputs = [ cloudpickle  numpy toolz dill pandas partd ];
+  propagatedBuildInputs = [
+    bokeh cloudpickle dill fsspec numpy pandas partd toolz ];
 
   checkPhase = ''
     py.test dask