CODEWITHSUNDEEP
pythonpython-3.x
Baz
Baz

Reputation: 13125

Convert Keys in Dictionary to All-Capitals

I wish to convert the keys in a dictionary to capitals, but I want the values summed of, for example, "A" and "a":

counter = {"A":1,"a":2,b:3}

this doesn't quite do it:

counter = {l.upper():c for l in counter}

What should I be doing?

Upvotes: 1

Views: 59

Answers (2)

wjandrea
wjandrea

Reputation: 32944

Use a defaultdict with int, then iterate over your dict, convert the keys, and add the values.

from collections import defaultdict

counter = {"A": 1, "a": 2, 'b': 3}
d = defaultdict(int)

for k, v in counter.items():
    k = k.upper()
    d[k] += v

print(dict(d))  # -> {'A': 3, 'B': 3}

Upvotes: 1

chepner
chepner

Reputation: 530970

Use a defaultdict.

from collections import defaultdict

d = defaultdict(int)

for k, v in counter.items():
    d[k.upper()] += v

d = dict(d)  # optional, if you really want just a regular dict in the end

Upvotes: 3

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