c = {x: '' for x in a}

[Erik Max Francis]

Hilbert wrote:

> What's wrong with this one though? It would totally make sense to
> me...
> 
> a = [1,2,3]
> c = {x: '' for x in a}

Those would be dictionary comprehensions, which aren't implemented. 
There's a PEP on them somewhere.

> Where can I find documentation about "[x for x in a]"? What is it
> called?

List comprehension.  Search python.org/doc for more information.

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