add Glyph.appendContour method for defcon API compat

src/ufoLib2/objects/glyph.py

@@ -6,6 +6,7 @@
 from fontTools.pens.pointPen import PointToSegmentPen, SegmentToPointPen
 
 from ufoLib2.objects.anchor import Anchor
+from ufoLib2.objects.contour import Contour
 from ufoLib2.objects.guideline import Guideline
 from ufoLib2.objects.image import Image
 from ufoLib2.pointPens.glyphPointPen import GlyphPointPen
@@ -148,6 +149,13 @@ def appendGuideline(self, guideline):
             guideline = Guideline(**guideline)
         self._guidelines.append(guideline)
 
+    def appendContour(self, contour):
+        if not isinstance(contour, Contour):
+            raise TypeError(
+                f"Expected {Contour.__name__}, found {type(contour).__name__}"
+            )
+        self.contours.append(contour)
+
     def copy(self, name=None):
         """Return a new Glyph (deep) copy, optionally override the new glyph name.
         """

src/ufoLib2/objects/point.py

@@ -7,7 +7,7 @@
 class Point:
     x = attr.ib(type=Union[int, float])
     y = attr.ib(type=Union[int, float])
-    type = attr.ib(type=Optional[str])
+    type = attr.ib(default=None, type=Optional[str])
     smooth = attr.ib(default=False, type=bool)
     name = attr.ib(default=None, type=Optional[str])
     identifier = attr.ib(default=None, type=Optional[str])

tests/objects/test_glyph.py

@@ -1,4 +1,6 @@
-from ufoLib2.objects import Anchor, Component, Glyph, Guideline, Image
+from ufoLib2.objects import Anchor, Contour, Component, Glyph, Guideline, Image, Point
+
+import pytest
 
 
 def test_copyDataFromGlyph(ufo_UbuTestData):
@@ -70,3 +72,20 @@ def _assert_equal_but_distinct_objects(glyph1, glyph2):
     d = a.copy(name="d")
     assert d.name == "d"
     _assert_equal_but_distinct_objects(d, a)
+
+
+def test_appendContour(ufo_UbuTestData):
+    font = ufo_UbuTestData
+
+    A = font["A"]
+    n = len(A.contours)
+
+    c = Contour(points=[Point(0, 0), Point(1, 1)])
+
+    A.appendContour(c)
+
+    assert len(A.contours) == n + 1
+    assert A.contours[-1] is c
+
+    with pytest.raises(TypeError, match="Expected Contour, found object"):
+        A.appendContour(object())