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Showing content from https://mail.python.org/pipermail/python-dev/2002-June/025951.html below:

[Python-Dev] Dict constructor

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> Second wild idea of the day:
> 
> The dict constructor currently accepts sequences where each element has
> length 2, interpreted as a key-value pair.
> 
> Let's have it also accept sequences with elements of length 1, interpreted
> as a key:None pair.
> 
> The benefit is that it provides a way to rapidly construct sets:
> 

The downside is that it's another way to write programs
incompatible with 2.2.

Thomas

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