Reversing elements in a dictionary?

[redct]

For example, let's say I have something like

letters = {'a':'01', 'b':'02', 'c':'03', 'd':'04', 'e':'05', 'f':'06', 'g':'07', 'h':'08', 'i':'09', 'j':'10', 'k':'11', 'l':'12', 'm':'13', 'n':'14', 'o':'15', 'p':'16', 'q':'17', 'r':'18', 's':'19', 't':'20', 'u':'21', 'v':'22', 'w':'23', 'x':'24', 'y':'25', 'z':'26'}            
 

Is there any built in function that could reverse the elements to

letters = {'01':'a', '02':'b'}

and so on?

[Laharl]

You can use dict.fromkeys() to do this, as it makes the keys the list passed as the first parameter and the values the optional second parameter:

letters = letters.fromkeys(letters.values(), letters.keys())