BUG: Remove use of C API not available in Python 3.

kiva/quartz/ABCGI.pyx

@@ -1824,7 +1824,7 @@ cdef class CGImageFile(CGImage):
 
         data = self.bmp_array.data
         s = piltostring(img)
-        py_data = PyString_AsString(s)
+        py_data = PyBytes_AsString(s)
 
         memcpy(<void*>data, <void*>py_data, len(s))
 
@@ -2766,7 +2766,7 @@ cdef CTLineRef _create_ct_line(object the_string, CTFontRef font, object stroke_
         return NULL
 
     the_string = the_string.encode('utf-8')
-    c_string = PyString_AsString(the_string)
+    c_string = PyBytes_AsString(the_string)
 
     cf_string = CFStringCreateWithCString(NULL, c_string, kCFStringEncodingUTF8)
     cf_attr_string = CFAttributedStringCreateMutable(NULL, 0)

kiva/quartz/Python.pxi

@@ -7,7 +7,7 @@ ctypedef void (*cobject_destr)(void *)
 cdef extern from "Python.h":
     ctypedef int size_t
     ctypedef int Py_ssize_t
-    char* PyString_AsString(object string)
+    char* PyBytes_AsString(object string)
     object PyString_FromString(char* c_string)
     object PyString_FromStringAndSize(char* v, Py_ssize_t len)
     int PyString_AsStringAndSize(object obj, char **buffer, Py_ssize_t *length)

kiva/tests/test_macport.py → kiva/tests/test_quartz.py

@@ -5,6 +5,16 @@
 from traitsui.tests._tools import skip_if_not_wx
 
 
+def test_quartz_importable():
+    if sys.platform != 'darwin':
+        from unittest.case import SkipTest
+        raise SkipTest("quartz is only built on OS X")
+
+    from kiva.quartz import ABCGI
+    from kiva.quartz import CTFont
+    from kiva.quartz import mac_context
+
+
 @skip_if_not_wx
 def test_macport():
     if sys.platform != 'darwin':