Count Digits and Letters in Python

You can use the isalpha() and isdigit() methods in Python to count the number of letters and digits in a string. Here is an example code:

def count_alpha_digit(s):
    alpha_count = 0
    digit_count = 0
    
    for char in s:
        if char.isalpha():
            alpha_count += 1
        elif char.isdigit():
            digit_count += 1
    
    return alpha_count, digit_count

s = "Hello123"
alpha_count, digit_count = count_alpha_digit(s)
print(f"字母个数：{alpha_count}")
print(f"数字个数：{digit_count}")

Running the above code will result in:

字母个数：5
数字个数：3