Vowel count

#### A ####

sentence = "Hello World."
vowels = {"a", "e", "i", "o", "u"}
stat = {}
for c in sentence.lower():
    if c in vowels:
        stat[c] = stat.get(c, 0) + 1
print(stat)

#### B ####
sentence = "Hello World."
vowels = {"a", "e", "i", "o", "u"}
for v in vowels:
    print(f"{v}: {sentence.lower().count(v)}")

#### C ####
sentence = "Hello World."
print([(x, sentence.lower().count(x)) for x in {"a", "e", "i", "o", "u"}])