pythonPackages.mt-940: fix build (#36784)

- added missing `enum34` dependency
- enabled tests
- moved expression into its own file

See ticket #36453
See https://hydra.nixos.org/build/70677609/log

/cc @the-kenny

pkgs/development/python-modules/mt-940/default.nix

@@ -0,0 +1,35 @@
+{ buildPythonPackage, stdenv, pytestrunner, pyyaml, pytest, enum34
+, pytestpep8, pytestflakes,fetchFromGitHub, isPy3k, lib, glibcLocales
+}:
+
+buildPythonPackage rec {
+  version = "v4.10.0";
+  pname = "mt940";
+
+  src = fetchFromGitHub {
+    owner = "WoLpH";
+    repo = pname;
+    rev = version;
+    sha256 = "1dsf2di8rr0iw2vaz6dppalby3y7i8x2bl0qjqvaiqacjxxvwj65";
+  };
+
+  patches = [
+    ./no-coverage.patch
+  ];
+
+  propagatedBuildInputs = [ pyyaml pytestrunner ]
+    ++ lib.optional (!isPy3k) enum34;
+
+  LC_ALL="en_US.UTF-8";
+
+  checkInputs = [ pytestpep8 pytestflakes pytest glibcLocales ];
+  checkPhase = ''
+    py.test
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A library to parse MT940 files and returns smart Python collections for statistics and manipulation";
+    homepage = "http://pythonhosted.org/mt-940/";
+    license = licenses.bsd3;
+  };
+}

pkgs/development/python-modules/mt-940/no-coverage.patch

@@ -0,0 +1,26 @@
+diff --git a/pytest.ini b/pytest.ini
+index fef28f5..f366331 100644
+--- a/pytest.ini
++++ b/pytest.ini
+@@ -4,10 +4,6 @@ python_files =
+     tests/*.py
+ 
+ addopts =
+-    --cov mt940
+-    --cov-report term-missing
+-    --cov-report html
+-    --no-cov-on-fail
+     --doctest-modules
+     --pep8
+     --flakes
+diff --git a/tests/requirements.txt b/tests/requirements.txt
+index fc55572..e52cc28 100644
+--- a/tests/requirements.txt
++++ b/tests/requirements.txt
+@@ -3,6 +3,5 @@
+ -r ../docs/requirements.txt
+ pytest
+ pytest-cache
+-pytest-cover
+ pytest-flakes
+ pytest-pep8