prevent cython.compiled raise AttributeError if cython not properly installed

It's possible sometimes that 'import cython' does not fail but then 'cython.compiled' raises AttributeError.
It actually happened in our internal production environment...

Similar issue to https://github.com/pydantic/pydantic/pull/573 and https://github.com/ipython/ipython/issues/13294

Lib/fontTools/cu2qu/cu2qu.py

@@ -17,10 +17,14 @@
 
 try:
     import cython
-except ImportError:
+
+    COMPILED = cython.compiled
+except (AttributeError, ImportError):
     # if cython not installed, use mock module with no-op decorators and types
     from fontTools.misc import cython
 
+    COMPILED = False
+
 import math
 
 from .errors import Error as Cu2QuError, ApproxNotFoundError
@@ -33,14 +37,6 @@ MAX_N = 100
 NAN = float("NaN")
 
 
-if cython.compiled:
-    # Yep, I'm compiled.
-    COMPILED = True
-else:
-    # Just a lowly interpreted script.
-    COMPILED = False
-
-
 @cython.cfunc
 @cython.inline
 @cython.returns(cython.double)

Lib/fontTools/misc/bezierTools.py

@@ -9,10 +9,14 @@ from collections import namedtuple
 
 try:
     import cython
-except ImportError:
+
+    COMPILED = cython.compiled
+except (AttributeError, ImportError):
     # if cython not installed, use mock module with no-op decorators and types
     from fontTools.misc import cython
 
+    COMPILED = False
+
 
 Intersection = namedtuple("Intersection", ["pt", "t1", "t2"])
 
@@ -48,13 +52,6 @@ __all__ = [
     "segmentSegmentIntersections",
 ]
 
-if cython.compiled:
-    # Yep, I'm compiled.
-    COMPILED = True
-else:
-    # Just a lowly interpreted script.
-    COMPILED = False
-
 
 def calcCubicArcLength(pt1, pt2, pt3, pt4, tolerance=0.005):
     """Calculates the arc length for a cubic Bezier segment.

Lib/fontTools/misc/symfont.py

@@ -123,15 +123,12 @@ def printGreenPen(penName, funcs, file=sys.stdout, docstring=None):
         """from fontTools.pens.basePen import BasePen, OpenContourError
 try:
 	import cython
-except ImportError:
+
+	COMPILED = cython.compiled
+except (AttributeError, ImportError):
 	# if cython not installed, use mock module with no-op decorators and types
 	from fontTools.misc import cython
 
-if cython.compiled:
-	# Yep, I'm compiled.
-	COMPILED = True
-else:
-	# Just a lowly interpreted script.
 	COMPILED = False
 
 

Lib/fontTools/pens/momentsPen.py

@@ -2,15 +2,12 @@ from fontTools.pens.basePen import BasePen, OpenContourError
 
 try:
     import cython
-except ImportError:
+
+    COMPILED = cython.compiled
+except (AttributeError, ImportError):
     # if cython not installed, use mock module with no-op decorators and types
     from fontTools.misc import cython
 
-if cython.compiled:
-    # Yep, I'm compiled.
-    COMPILED = True
-else:
-    # Just a lowly interpreted script.
     COMPILED = False
 
 

Lib/fontTools/qu2cu/qu2cu.py

@@ -18,10 +18,14 @@
 
 try:
     import cython
-except ImportError:
+
+    COMPILED = cython.compiled
+except (AttributeError, ImportError):
     # if cython not installed, use mock module with no-op decorators and types
     from fontTools.misc import cython
 
+    COMPILED = False
+
 from fontTools.misc.bezierTools import splitCubicAtTC
 from collections import namedtuple
 import math
@@ -35,14 +39,6 @@ from typing import (
 __all__ = ["quadratic_to_curves"]
 
 
-if cython.compiled:
-    # Yep, I'm compiled.
-    COMPILED = True
-else:
-    # Just a lowly interpreted script.
-    COMPILED = False
-
-
 # Copied from cu2qu
 @cython.cfunc
 @cython.returns(cython.int)

Lib/fontTools/varLib/iup.py

@@ -7,15 +7,12 @@ from numbers import Integral, Real
 
 try:
     import cython
-except ImportError:
+
+    COMPILED = cython.compiled
+except (AttributeError, ImportError):
     # if cython not installed, use mock module with no-op decorators and types
     from fontTools.misc import cython
 
-if cython.compiled:
-    # Yep, I'm compiled.
-    COMPILED = True
-else:
-    # Just a lowly interpreted script.
     COMPILED = False