diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -9,6 +9,7 @@ from node import hex, bin, nullid, nullr
 from lock import release
 from i18n import _
 import os, re, difflib, time, tempfile, errno
+import sys
 import hg, scmutil, util, revlog, copies, error, bookmarks
 import patch, help, encoding, templatekw, discovery
 import archival, changegroup, cmdutil, hbisect
@@ -2159,7 +2160,10 @@ def debuginstall(ui):
         ui.write(_(" (check that your locale is properly set)\n"))
         problems += 1
 
-    # Python lib
+    # Python
+    ui.status(_("showing Python executable (%s)\n") % sys.executable)
+    ui.status(_("showing Python version (%s)\n")
+              % ("%s.%s.%s" % sys.version_info[:3]))
     ui.status(_("checking Python lib (%s)...\n")
               % os.path.dirname(os.__file__))
 
diff --git a/tests/test-install.t b/tests/test-install.t
--- a/tests/test-install.t
+++ b/tests/test-install.t
@@ -1,6 +1,8 @@
 hg debuginstall
   $ hg debuginstall
   checking encoding (ascii)...
+  showing Python executable (*) (glob)
+  showing Python version (2.*) (glob)
   checking Python lib (*lib*)... (glob)
   checking installed modules (*mercurial)... (glob)
   checking templates (*mercurial?templates)... (glob)
@@ -11,6 +13,8 @@ hg debuginstall
 hg debuginstall with no username
   $ HGUSER= hg debuginstall
   checking encoding (ascii)...
+  showing Python executable (*) (glob)
+  showing Python version (2.*) (glob)
   checking Python lib (*lib*)... (glob)
   checking installed modules (*mercurial)... (glob)
   checking templates (*mercurial?templates)... (glob)