How can I reverse both keys and values in a dictionary in python?

Question

I have a dictionary {a:1,b:2,c:3} .

How can I print in reverse order:

c 3
b 2
a 1

Answer 1

Assuming python 3.6+, for which insertion order in dictionaries is maintained ( guaranteed for python 3.7+ ), you can use reversed :

d = {'a':1, 'b':2, 'c':3}

out = dict(reversed(d.items()))

# or
out = {k: d[k] for k in reversed(d)}

Output:

{'c': 3, 'b': 2, 'a': 1}

If you want to print :

for k, v in reversed(d.items()):
    print(k, v)

Or:

for k in reversed(d):
    print(k, d[k])

Output:

c 3
b 2
a 1