On the joyous occasion of Python 3000's release my friends & I were
playing with "import antigravity" and it failed for someone with the
following traceback (anonymized):

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/.../lib/python3.0/antigravity.py", line 4, in <module>
    webbrowser.open("http://xkcd.com/353/")
  File "/.../lib/python3.0/webbrowser.py", line 61, in open
    if browser.open(url, new, autoraise):
  File "/.../lib/python3.0/webbrowser.py", line 275, in open
    success = self._invoke(args, True, autoraise)
  File "/.../lib/python3.0/webbrowser.py", line 226, in _invoke
    inout = open(os.devnull, "r+")
  File "/.../lib/python3.0/webbrowser.py", line 61, in open
    if browser.open(url, new, autoraise):
  File "/.../lib/python3.0/webbrowser.py", line 271, in open
    "expected 0, 1, or 2, got %s" % new)
webbrowser.Error: Bad 'new' parameter to open(); expected 0, 1, or 2, got r+

I believe the following patch (against branches/release30-maint) fixes
it cleanly:

Index: Lib/webbrowser.py
===================================================================
--- Lib/webbrowser.py	(revision 67538)
+++ Lib/webbrowser.py	(working copy)
@@ -8,6 +8,7 @@
 import stat
 import subprocess
 import time
+import builtins
 
 __all__ = ["Error", "open", "open_new", "open_new_tab", "get", "register"]
 
@@ -223,7 +224,7 @@
         cmdline = [self.name] + raise_opt + args
 
         if remote or self.background:
-            inout = open(os.devnull, "r+")
+            inout = builtins.open(os.devnull, "r+")
         else:
             # for TTY browsers, we need stdin/out
             inout = None

I'd suggest the same thing that was done on lines 351-352.

Index: Lib/webbrowser.py
===================================================================
--- Lib/webbrowser.py	(revision 67538)
+++ Lib/webbrowser.py	(working copy)
@@ -223,7 +223,8 @@
         cmdline = [self.name] + raise_opt + args
 
         if remote or self.background:
-            inout = open(os.devnull, "r+")
+            import io
+            inout = io.open(os.devnull, "r+")
         else:
             # for TTY browsers, we need stdin/out
             inout = None

Fixed in 67539 (py3k) and 67540 (release30-maint)
Thanks for the report!

I believe you forgot to "import io" in UnixBrowser (line 226).

sorry**10... probably a wrong copy operation because the Linux machine
where I tested did not have my svn ssh keys.
Someone already corrected this on py3k (r67544, thanks to Fred!), I'll
take care of merging it to the 3.0 branch.

Merged the 2nd fix with r67602.

This problem is happening in my linux box:

Python 3.2 (r32:88445, Feb 21 2011, 01:55:53) 
[GCC 4.5.2 20110127 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import antigravity
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.2/antigravity.py", line 5, in <module>
    webbrowser.open("http://xkcd.com/353/")
  File "/usr/lib/python3.2/webbrowser.py", line 62, in open
    if browser.open(url, new, autoraise):
  File "/usr/lib/python3.2/webbrowser.py", line 276, in open
    success = self._invoke(args, True, autoraise)
  File "/usr/lib/python3.2/webbrowser.py", line 239, in _invoke
    stderr=inout, preexec_fn=setsid)
  File "/usr/lib/python3.2/subprocess.py", line 736, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.2/subprocess.py", line 1330, in _execute_child
    raise child_exception_type(errno_num, err_msg)
OSError: [Errno 9] Bad file descriptor
>>>

Despite the apparent similarity, your issue is something different from what was reported in this issue.  Could you please open a new issue for your problem?

yes, you right, I will create a new issue, thanks.