repr(x) == repr(y) <=> x == y AND eval(repr(x)) == x

Thorsten Kampe thorsten at thorstenkampe.de
Sat Oct 19 16:30:33 CEST 2002


* Chermside, Michael
>> A wise man once said to me:
>> ,---
>> | You're FAR more likely to meet objects where you can't count on
>> | eval(repr(x)) == x, than non-hashable objects.
>> `---
>
> Trust your wise friend.

He's not my friend but I trust anyone who knows Python better than
me. I was just curious, /why/ and /when/.

The "Python Cookbook" (17.3 Removing Duplicates from a Sequence,
Credit: Tim Peters) has a better approach: Try to use a dictionary, if
that fails because of non-hashable items, use a different algorithm
with a list instead.


Thorsten



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