diff --git a/pdfminer/image.py b/pdfminer/image.py
index 3bcad3b..b6b8bab 100644
--- a/pdfminer/image.py
+++ b/pdfminer/image.py
@@ -80,7 +80,7 @@ class ImageWriter(object):
             ext = '.%d.%dx%d.img' % (image.bits, width, height)
         name = image.name+ext
         path = os.path.join(self.outdir, name)
-        fp = file(path, 'wb')
+        fp=open(path, 'wb')
         if ext == '.jpg':
             raw_data = stream.get_rawdata()
             if LITERAL_DEVICE_CMYK in image.colorspace:
diff --git a/pdfminer/pdftypes.py b/pdfminer/pdftypes.py
index 2ea6aea..07dff53 100644
--- a/pdfminer/pdftypes.py
+++ b/pdfminer/pdftypes.py
@@ -233,7 +233,7 @@ class PDFStream(PDFObject):
             params = [params] * len(filters)
         if settings.STRICT and len(params) != len(filters):
             raise PDFException("Parameters len filter mismatch")
-        return zip(filters, params)
+        return list(zip(filters, params)) #solves https://github.com/pdfminer/pdfminer.six/issues/15
 
     def decode(self):
         assert self.data is None and self.rawdata is not None