Chap2Q3.py

s = input('Enter a sentence : ')
number_of_words = 1
number_of_characters = len(s)
al_num = 0
for i in s:
    if i.isalnum():
        al_num += 1
    if i == ' ': # there is a space means there is another word
        number_of_words += 1
print('Number of words are', number_of_words)
print('Number_of_characters are', number_of_characters)
print('Percentage of characters that are alphanumric is', al_num*100/len(s), '%')