diff -r 2f0716009132 Lib/gzip.py
--- a/Lib/gzip.py	Tue Jul 12 18:24:25 2016 -0400
+++ b/Lib/gzip.py	Fri Jul 15 20:00:21 2016 +0300
@@ -177,6 +177,7 @@
         elif mode.startswith(('w', 'a', 'x')):
             self.mode = WRITE
             self._init_write(filename)
+            self.compresslevel = compresslevel
             self.compress = zlib.compressobj(compresslevel,
                                              zlib.DEFLATED,
                                              -zlib.MAX_WBITS,
@@ -237,7 +238,14 @@
         if mtime is None:
             mtime = time.time()
         write32u(self.fileobj, int(mtime))
-        self.fileobj.write(b'\002')
+
+        if self.compresslevel == 1:  # fastest compression
+            self.fileobj.write(b'\004')
+        elif self.compresslevel == 9:  # maximum compression
+            self.fileobj.write(b'\002')
+        else:
+            self.fileobj.write(b'\000')
+
         self.fileobj.write(b'\377')
         if fname:
             self.fileobj.write(fname + b'\000')