Fixed one new class variable. Updated the script to run mypy.

cura/LayerPolygon.py

@@ -1,6 +1,6 @@
 from UM.Math.Color import Color
 from UM.Application import Application
-
+from typing import Any
 import numpy
 
 
@@ -173,7 +173,7 @@ class LayerPolygon:
 
         return normals
 
-    __color_map = None
+    __color_map = None # type: numpy.ndarray[Any]
 
     ##  Gets the instance of the VersionUpgradeManager, or creates one.
     @classmethod

run_mypy.py

@@ -1,8 +1,17 @@
 #!env python
 import os
+import sys
 import subprocess
 
-os.putenv("MYPYPATH", r".;.\plugins;.\plugins\VersionUpgrade;..\Uranium_hint\;..\Uranium_hint\stubs\\" )
+# A quick Python implementation of unix 'where' command.
+def where(exeName):
+    searchPath = os.getenv("PATH")
+    paths = searchPath.split(";" if sys.platform == "win32" else ":")
+    for path in paths:
+        candidatePath = os.path.join(path, exeName)
+        if os.path.exists(candidatePath):
+            return candidatePath
+    return None
 
 def findModules(path):
     result = []
@@ -11,6 +20,13 @@ def findModules(path):
             result.append(entry.name)
     return result
 
+def main():
+    os.putenv("MYPYPATH", r".;.\plugins;.\plugins\VersionUpgrade;..\Uranium_hint\;..\Uranium_hint\stubs\\" )
+
+    # Mypy really needs to be run via its Python script otherwise it can't find its data files.
+    mypyExe = where("mypy.bat" if sys.platform == "win32" else "mypy")
+    mypyModule = os.path.join(os.path.dirname(mypyExe), "mypy")
+
     plugins = findModules("plugins")
     plugins.sort()
 
@@ -18,7 +34,7 @@ mods = ["cura"] + plugins + findModules("plugins/VersionUpgrade")
 
     for mod in mods:
         print("------------- Checking module {mod}".format(**locals()))
-    result = subprocess.run(["python", r"c:\python35\Scripts\mypy", "-p", mod])
+        result = subprocess.run([sys.executable, mypyModule, "-p", mod])
         if result.returncode != 0:
             print("""
     Module {mod} failed checking. :(
@@ -29,3 +45,5 @@ else:
 
     Done checking. All is good.
     """)
+    return 0
+sys.exit(main())