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[Python-Dev] join() et al.

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>     Marc> join(seq,sep) := reduce(lambda x,y: x + sep + y, seq)
>
> Of course, while it will always yield what you ask for, it might not always
> yield what you expect:
> 
>     >>> seq = [1,2,3]
>     >>> sep = 5
>     >>> reduce(lambda x,y: x + sep + y, seq)
>     16

not to mention:

>>> print join([], " ")
TypeError: reduce of empty sequence with no initial value

...

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