Как вывести количество строчных и прописных букв на python?

User_Str = input('Enter your text\n')
Index = 0
Upper = 0
Lower = 0
try:
    while True:
        if User_Str[Index] == User_Str[Index].upper():
            Upper += 1
    
        else:
            Lower += 1
    
        Index += 1
except:
    print('Upper =', Upper,'Lower =',Lower)

s = 'Trixie is Best Pony!'
count_lower = 0
count_upper = 0
i = 0
while i < len(s):
    if s[i].islower(): count_lower += 1
    if s[i].isupper(): count_upper += 1
    i += 1
print(count_lower, count_upper)

User_Str = input('Enter your text: ')
Index = 0
Upper = 0
Lower = 0
count = len(User_Str)
while count:    
    if User_Str[Index].isalpha():
        if User_Str[Index].isupper():
            Upper += 1
    
        else:
            Lower += 1
    
    Index += 1
    count -=1
print(f'String_length = {len(User_Str)}, Upper = {Upper}, Lower = {Lower}')

>>> s = 'Trixie is Best Pony!'
>>> sum(map(str.isupper,s))
3
>>> sum(map(str.islower,s))
13