Combining lists to dictionary

Ben Finney ben+python at benfinney.id.au
Wed Nov 12 02:16:59 CET 2014


Denis McMahon <denismfmcmahon at gmail.com> writes:

> Hi
>
> Given x,y are a lists of keys and value that I wish to combine to a 
> dictionary, such that x[n] is the key for value y[n], which is preferred:
>
> z = {a:b for (a,b) in zip(x,y)}

This one, with the caveat to use PEP-8 compatible formatting::

    z = {a: b for (a, b) in zip(x, y)}

> z = {x[n]:y[n] for n in range(min(len(x),len(y)))}

Too much indirection for no gain that I can see.

> The zip feels more elegant, but it seems clunky to use the zip method to 
> create a list of tuples just to split them up into key:value pairs.

I think ‘zip’ has this as a primary intended purpose, so it seems fine
to me.

-- 
 \         “Of all classes the rich are the most noticed and the least |
  `\      studied.” —John Kenneth Galbraith, _The Age of Uncertainty_, |
_o__)                                                             1977 |
Ben Finney




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