Sorting of Python union type members is performed during latest definitions search

python/src/com/jetbrains/python/documentation/PythonDocumentationProvider.java

@@ -160,12 +160,13 @@ public class PythonDocumentationProvider extends AbstractDocumentationProvider i
       }
     }
     if (type instanceof PyUnionType) {
-      final List<String> typeNames = new ArrayList<String>();
-      for (PyType t : ((PyUnionType)type).getMembers()) {
-        typeNames.add(getTypeName(t, context));
-      }
-      Collections.sort(typeNames);
-      return String.format("one of (%s)", StringUtil.join(typeNames, ", "));
+      return String.format("one of (%s)", StringUtil.join(((PyUnionType)type).getMembers(),
+                                                          new Function<PyType, String>() {
+                                                            @Override
+                                                            public String fun(PyType t) {
+                                                              return getTypeName(t, context);
+    }
+                                                          }, ", "));
     }
     return name;
   }

python/src/com/jetbrains/python/refactoring/PyDefUseUtil.java

@@ -15,8 +15,7 @@ import com.jetbrains.python.psi.PyTargetExpression;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.Collection;
-import java.util.HashSet;
+import java.util.*;
 
 /**
  * @author Dennis.Ushakov
@@ -36,7 +35,19 @@ public class PyDefUseUtil {
     final boolean[] visited = new boolean[instructions.length];
     final Collection<PyElement> result = new HashSet<PyElement>();
     getLatestDefs(var, instructions, instr, visited, result);
-    return result.toArray(new PyElement[result.size()]);
+    final List<PyElement> sortedResult = new ArrayList<PyElement>();
+    sortedResult.addAll(result);
+    Collections.sort(sortedResult, new Comparator<PyElement>() {
+      @Override
+      public int compare(PyElement e1, PyElement e2) {
+        final String n1 = e1.getName();
+        if (n1 != null) {
+          return n1.compareTo(e2.getName());
+        }
+        return 0;
+      }
+    });
+    return sortedResult.toArray(new PyElement[sortedResult.size()]);
   }
 
   private static void getLatestDefs(final PyElement var,