Py3: Port Wizard shaft to Python 3

src/Mod/PartDesign/WizardShaft/SegmentFunction.py

@@ -120,7 +120,7 @@ class SegmentFunction:
 
     def buildFromDict(self, var, dict):
         self.variable = var
-        for key in sorted(dict.iterkeys()):
+        for key in sorted(dict.keys()):
             #if abs(dict[key]) > 1E-9:
             self.segments.append(SegmentFunctionSegment(key, var, dict[key], 0))
             
@@ -129,7 +129,7 @@ class SegmentFunction:
             self.segments.insert(self.index(st), SegmentFunctionSegment(st, self.variable, coeff, exp))
 
     def addSegments(self, dict):
-        for key in sorted(dict.iterkeys()):
+        for key in sorted(dict.keys()):
             self.addSegment(key,  dict[key])
 
     def setMaxX(self, mx):

src/Mod/PartDesign/WizardShaft/WizardShaftTable.py

@@ -50,7 +50,7 @@ class WizardShaftTable:
               ]    
 
     def __init__(self, w, s):
-        for key in self.rowDict.iterkeys():
+        for key in iter(self.rowDict.keys()):
             self.rowDictReverse[self.rowDict[key]] = key
         # Set parent wizard (for connecting slots)
         self.wizard = w