Python program that accepts a string and calculate the number of digits and letters and space

Sure, here is a Python program that calculates the number of digits, letters and spaces in a given string:

def count_chars(s):
    digits = letters = spaces = 0

    for char in s:
        if char.isdigit():
            digits += 1
        elif char.isalpha():
            letters += 1
        elif char.isspace():
            spaces += 1

    return digits, letters, spaces

s = input("Enter a string: ")
digits, letters, spaces = count_chars(s)

print("Digits: ", digits)
print("Letters: ", letters)
print("Spaces: ", spaces)

In this program, we define a function count_chars(s) that takes a string s as input. It initializes three counters digits, letters, and spaces to 0. Then it iterates over each character in the string. If the character is a digit (checked using char.isdigit()), it increments the digits counter. If the character is a letter (checked using char.isalpha()), it increments the letters counter. If the character is a space (checked using char.isspace()), it increments the spaces counter. Finally, it returns the three counters.

The main part of the program asks the user to enter a string, calls the count_chars(s) function with the entered string, and prints the returned counts of digits, letters, and spaces.