[Python-Dev] test warnings for "%x"%id(foo) on 2.3 branch

Martin v. Löwis martin at v.loewis.de
Wed Nov 5 14:43:43 EST 2003

Anthony Baxter <anthony at interlink.com.au> writes:

> >>> Anthony Baxter wrote
> > Hm. "%x" % (id(o) & 2L*sys.maxint+1)
> > is considerably less obvious that "%x"%id(o)
> The best I can come up with at this moment using the 'struct' module is
> ''.join(['%02x'%ord(x) for x in struct.pack('>i', id(o))]), which is also
> pretty grotesque. 

In what sense is this better - in particular if you would write mine as

MAX_UINT = 2L*sys.maxint+1
"%x" % (id(o) & MAX_UINT)

> Thinking about it further, the better fix might be to replace the test
> code that looks for an exact match with a regex-based match instead...

It's not just in test code, AFAIR - also in minidom __repr__ (or some


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