Vowel count

from glob import glob
counts = {v : 0 for v in "aáeéěiíoóuúů"}
text = "".join([open(f, "r").read() for f in glob("*.txt")])
vowels = list(filter(lambda x : x in "aáeéěiíoóuúů", text))
for e in vowels:
    counts[e] = counts[e] + 1
[print("{}: {}".format(v, c)) for v, c in counts.items() if c > 0]