counter.py

file = open("lorem.txt", "r")

text = file.read()

v = 0
c = 0
u = 0
l = 0

for char in text:
    if char.lower() in "aeiou": # this will match char against { a e i o u } and { A E I O U } because char is converted to lowercase
        v += 1
    else:                       # else this is a consonant
        c += 1

    if char.isupper():          # test whether the char is upper
        u += 1
    else:                       # or lower
        l += 1
        
file.close()

print("Vowels =", v)
print("Consonants =", c)
print("Lowercase letters =", l)
print("Uppercase letters =", u)