Minor code cleanliness nit.

lib/python/Products/PageTemplates/ZopePageTemplate.py

@@ -15,9 +15,10 @@
 Zope object encapsulating a Page Template.
 """
 
-__version__='$Revision: 1.33 $'[11:-2]
+__version__='$Revision: 1.34 $'[11:-2]
 
 import os, AccessControl, Acquisition, sys
+from types import StringType
 from Globals import DTMLFile, ImageFile, MessageDialog, package_home
 from zLOG import LOG, ERROR, INFO
 from OFS.SimpleItem import SimpleItem
@@ -128,8 +129,8 @@ class ZopePageTemplate(Script, PageTemplate, Historical, Cacheable,
         """Replace the document with the text in file."""
         if SUPPORTS_WEBDAV_LOCKS and self.wl_isLocked():
             raise ResourceLockedError, "File is locked via WebDAV"
-            
-        if type(file) is not type(''): 
+
+        if isinstance(file, StringType): 
             if not file: raise ValueError, 'File not specified'
             file = file.read()