bisect and lists of user defined objects (python 3) -

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before python 3, used bisect insert user-defined objects list. bisect happy because user-defined object had def __cmp__ defined how compare objects. i've read rationale not supporting cmp in python 3 , i'm fine that. thought fix old code 'decorate' user-defined object turning tuple 

(integer, user-defined object).

however, if have list of tuples, , try ...

i = bisect_left([list_of_tuples], (integer, user-defined object))

then error "builtins.typeerror: unorderable types ..."

so, (in python 3) how use bisect lists of items aren't made entirely of things natural sort order?

you need add __lt__ method; used comparisons instead of __cmp__


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