fast dictionary initialization

[Tim Chase]

On 2016-06-10 14:07, maurice wrote:
> example:
> valuesList = [1,2,3]
> keysList   = ['1','2','3']
> 
> So the dictionary can basically convert string to int:
> 
> dictionary = {'1':1, '2':2, '3':3}

A couple similar options:


The most straightforward translation of your description:

  opt1 = dict(zip(keysList, valuesList))
  print(opt1["2"])

And one where you generate the strings on the fly:

  opt2 = dict((str(i), i) for i in range(1, 4))
  print(opt2["2"])

And one where you use the int() function instead of a mapping because
the whole idea of storing a dict worth of string-numbers-to-numbers
seems somewhat silly to me:

  print(int("2"))

-tkc