--- zipfile.py.orig	2010-03-22 09:51:08.628414597 +0100
+++ zipfile.py	2010-03-22 09:51:45.298413728 +0100
@@ -1079,14 +1079,17 @@
         self.filelist.append(zinfo)
         self.NameToInfo[zinfo.filename] = zinfo
 
-    def writestr(self, zinfo_or_arcname, bytes):
+    def writestr(self, zinfo_or_arcname, bytes, compress_type=None):
         """Write a file into the archive.  The contents is the string
         'bytes'.  'zinfo_or_arcname' is either a ZipInfo instance or
         the name of the file in the archive."""
         if not isinstance(zinfo_or_arcname, ZipInfo):
             zinfo = ZipInfo(filename=zinfo_or_arcname,
                             date_time=time.localtime(time.time())[:6])
-            zinfo.compress_type = self.compression
+            if compress_type is None:
+                zinfo.compress_type = self.compression
+            else:
+                zinfo.compress_type = compress_type
             zinfo.external_attr = 0600 << 16
         else:
             zinfo = zinfo_or_arcname