pythonPackages.ofxtools: unbreak

- Remove `sqlalchemy` from `buildInputs`. This dependency was removed in
  [0.7.0]. Per the project's readme, `ofxtools` only depends on the
  standard library.

- Disable for Python versions older than 3.7, the minimum Python version
  supported by `ofxtools` starting with the [0.8.17] release.

- Fix the `checkPhase` by fetching from GitHub instead of PyPI to get a
  distribution that includes tests, overriding the home directory to
  allow tests that depend on it being writeable, and switching to
  `nosetests` to match the upstream project's test setup.

[0.7.0]: 8a795787d9
[0.8.17]: ddeda980ed

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

@@ -1,30 +1,35 @@
 { stdenv
 , buildPythonPackage
-, fetchPypi
+, fetchFromGitHub
+, nose
 , python
-, sqlalchemy
+, pythonOlder
 }:
 
 buildPythonPackage rec {
   pname = "ofxtools";
   version = "0.8.20";
 
-  src = fetchPypi {
-    inherit pname version;
-    sha256 = "87245679911c0c12429a476fd269611512d3e4b44cb8871159bb76ba70f8a46f";
+  disabled = pythonOlder "3.7";
+
+  # PyPI distribution does not include tests
+  src = fetchFromGitHub {
+    owner = "csingley";
+    repo = pname;
+    rev = version;
+    sha256 = "1s3fhhmj1acnmqglh39003db0bi451m4hcrkcpyrkqf5m32lslz8";
   };
 
+  checkInputs = [ nose ];
+  # override $HOME directory:
+  #   error: [Errno 13] Permission denied: '/homeless-shelter'
   checkPhase = ''
-    ${python.interpreter} -m unittest discover -s ofxtools
+    HOME=$TMPDIR nosetests tests/*.py
   '';
 
-  buildInputs = [ sqlalchemy ];
-
   meta = with stdenv.lib; {
     homepage = "https://github.com/csingley/ofxtools";
     description = "Library for working with Open Financial Exchange (OFX) formatted data used by financial institutions";
     license = licenses.mit;
-    broken = true;
   };
-
 }