update to python3.7

lib/python3.7/site-packages/PIL/_util.py

@@ -0,0 +1,30 @@
+import os
+import sys
+
+py3 = sys.version_info.major >= 3
+
+if py3:
+    def isStringType(t):
+        return isinstance(t, str)
+
+    def isPath(f):
+        return isinstance(f, (bytes, str))
+else:
+    def isStringType(t):
+        return isinstance(t, basestring)
+
+    def isPath(f):
+        return isinstance(f, basestring)
+
+
+# Checks if an object is a string, and that it points to a directory.
+def isDirectory(f):
+    return isPath(f) and os.path.isdir(f)
+
+
+class deferred_error(object):
+    def __init__(self, ex):
+        self.ex = ex
+
+    def __getattr__(self, elt):
+        raise self.ex