featureWriters: use py3 getfullargspec

Lib/ufo2ft/featureWriters/__init__.py

@@ -1,16 +1,12 @@
 import importlib
-from inspect import isclass
+from inspect import isclass, getfullargspec
 
 from ufo2ft.util import _loadPluginFromString
 
 from .baseFeatureWriter import BaseFeatureWriter
 from .kernFeatureWriter import KernFeatureWriter
 from .markFeatureWriter import MarkFeatureWriter
 
-try:
-    from inspect import getfullargspec as getargspec  # PY3
-except ImportError:
-    from inspect import getargspec  # PY2
 
 import logging
 
@@ -45,7 +41,7 @@ def write(self, font, feaFile, compiler=None)
     if not hasattr(klass, "write"):
         logger.error("%r does not have a required 'write' method", klass)
         return False
-    if getargspec(klass.write).args != getargspec(BaseFeatureWriter.write).args:
+    if getfullargspec(klass.write).args != getfullargspec(BaseFeatureWriter.write).args:
         logger.error("%r 'write' method has incorrect signature", klass)
         return False
     return True