Fix/issue 209 (#210)

* Fix issue 209 by using repr as alternative sort key.

* Add unit test to catch issue #209.

* Update changelog.

changelog.txt

@@ -27,7 +27,7 @@ next
  - Fix issue causing a failure of the automatic conversion of valid key types (#168, #205).
  - Improve the 'dots in keys' error message to make it easier to fix related issues (#170, #205).
  - Update the ``__repr__`` and ``__repr_html__`` implementations of the ``Project`, ``Job``, and ``JobsCursor`` classes (#193).
-
+ - Fix issue with heterogeneous types in state point values that are lists (#209).
 
 [1.1.0] -- 2019-05-19
 ---------------------

signac/contrib/schema.py

@@ -93,7 +93,10 @@ def _fmt_value(x):
                 return str(x)
 
         def _fmt_range(type_, values):
-            sorted_values = sorted(values)
+            try:
+                sorted_values = sorted(values)
+            except TypeError:
+                sorted_values = sorted(values, key=repr)
             if len(values) <= max_num_range:
                 values_string = ', '.join((_fmt_value(v) for v in sorted_values))
             else:

tests/test_project.py

@@ -660,7 +660,7 @@ def test_schema(self):
                 'const2': {'const3': 0},
                 'a': i,
                 'b': {'b2': i},
-                'c': [i, 0, 0],
+                'c': [i if i % 2 else None, 0, 0],
                 'd': [[i, 0, 0]],
                 'e': {'e2': [i, 0, 0]} if i % 2 else 0,  # heterogeneous!
                 'f': {'f2': [[i, 0, 0]]},