Exercise 06-20.b:
Write a program that generates a dictionary, where each key is a character and its value is the number of that character found in a sentence input by the user.
Example: “The mouse”
-> {‘T’: 1, ‘h’: 1, ‘e’: 2, ’ ‘: 1, ‘m’: 1, ‘o’: 1, ‘u’: 1, ‘s’: 1}
Answer:
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# Python From Scratch
# Author: Nilo Ney Coutinho Menezes
# Editora Novatec (c) 2010-2025 - LogiKraft 2025
# Site: https://pythonfromscratch.com
# ISBN: 978-85-7522-949-1 (Paperback), 978-85-7522-950-7 (hardcover), 978-85-7522-951-4 (ebook)
#
# File: chapter 06/exercise-06-20.b.py.py
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# Alternative solution, using the dictionary's get method
sentence = input("Enter a sentence to count the letters:")
d = {}
for letter in sentence:
# If letter doesn't exist in dictionary, returns 0
# if it exists, returns the previous value
d[letter] = d.get(letter, 0) + 1
print(d)