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Challenge # 5

Count Words in a Sentence (Ignore Punctuation)

Objective

Parse a sentence, remove punctuation, and count the number of words.

You are given a string variable named sentence.
Write a function count_words(sentence) that returns the number of words in the sentence.
You must ignore punctuation characters such as . , ! ? ; : and count only valid words.
Words are separated by spaces.
Treat contractions like "don't" as one word.
Assume the input is a valid string.

Constraints:

Do not use input(). • Use only standard Python libraries.

Exemple IO

Input: sentence = "Hello, world!"
Output: 2

Input: sentence = "Well... this is unexpected, isn't it?"
Output: 6

Input: sentence = "No punctuation here"
Output: 3

Output:

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