python.pkgs.sympy: move expression

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

@@ -0,0 +1,34 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, glibcLocales
+, mpmath
+}:
+
+buildPythonPackage rec {
+  pname = "sympy";
+  version = "1.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1bpzjwr9hrr7w88v4vgnj9lr6vxcldc94si13n8xpr1rv08d5b1y";
+  };
+
+  checkInputs = [ glibcLocales ];
+
+  propagatedBuildInputs = [ mpmath ];
+
+  # Bunch of failures including transients.
+  doCheck = false;
+
+  preCheck = ''
+    export LANG="en_US.UTF-8"
+  '';
+
+  meta = {
+    description = "A Python library for symbolic mathematics";
+    homepage    = http://www.sympy.org/;
+    license     = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ lovek323 ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -16328,33 +16328,7 @@ in {
     };
   };
 
-  sympy = buildPythonPackage rec {
+  sympy = callPackage ../development/python-modules/sympy { };
-    name = "sympy-1.0";
-
-    src = pkgs.fetchurl {
-      url    = "mirror://pypi/s/sympy/${name}.tar.gz";
-      sha256 = "1bpzjwr9hrr7w88v4vgnj9lr6vxcldc94si13n8xpr1rv08d5b1y";
-    };
-
-    buildInputs = [ pkgs.glibcLocales ];
-
-    propagatedBuildInputs = with self; [ mpmath ];
-
-    # Bunch of failures including transients.
-    doCheck = false;
-
-    preCheck = ''
-      export LANG="en_US.UTF-8"
-    '';
-
-    meta = {
-      description = "A Python library for symbolic mathematics";
-      homepage    = http://www.sympy.org/;
-      license     = licenses.bsd3;
-      maintainers = with maintainers; [ lovek323 ];
-      platforms   = platforms.unix;
-    };
-  };
 
   pilkit = buildPythonPackage rec {
     name = "pilkit-1.1.4";