Dictionaries and lambda functions

How to use lambda functions to sort, or apply functions to dictionaries

mydict={'a':4, 'bright':1, 'day':0, 'starts': 10, 'with':-2, 'kisses': 13}

mydict.items()

dict_items([('a', 4), ('bright', 1), ('day', 0), ('starts', 10), ('with', -2), ('kisses', 13)])

Sort using keys or its values

sorted(mydict.items(), key=lambda item : item[0])

[('a', 4),
 ('bright', 1),
 ('day', 0),
 ('kisses', 13),
 ('starts', 10),
 ('with', -2)]

sorted(mydict.items(), key=lambda item : item[1])

[('with', -2),
 ('day', 0),
 ('bright', 1),
 ('a', 4),
 ('starts', 10),
 ('kisses', 13)]

Apply other functions using lambdas

min(mydict.items(), key=lambda item : item[0])

('a', 4)

min(mydict.items(), key=lambda item : item[1])

('with', -2)

max(mydict.items(), key=lambda item : item[0])

('with', -2)

we can also apply multiple conditions

sorted(mydict.items(), key=lambda item : (item[1]))

[('with', -2),
 ('day', 0),
 ('bright', 1),
 ('a', 4),
 ('starts', 10),
 ('kisses', 13)]

l = sorted(mydict.items(), key=lambda item : (item[1], len(item[0])))
mynewdict = {k:v for k, v in l}
mynewdict

{'with': -2, 'day': 0, 'bright': 1, 'a': 4, 'starts': 10, 'kisses': 13}