Recap: Transmission Toolkit

Combine string reverse, palindrome, anagram, filter/transform, and two pointers

Mission: Transmission Toolkit

Incoming transmissions are noisy and scrambled. Build a small toolkit of helper functions, then use them together to make sense of the signal. Pull together everything from this chapter:

clean_text(text): filter and transform: keep only the letters and convert them to lowercase (use .isalpha()).

is_palindrome(word): check whether the word reads the same both ways, using the two pointers technique (one pointer at the start, one at the end, move them towards the centre).

are_anagrams(a, b): clean both words, then check whether they are anagrams (same letters, different order). Sort the letters and compare.

reverse_words(sentence): reverse the order of the words in a sentence (not the letters). Split, reverse the list, join back with spaces.

Test with:

palindrome_text = "A man, a plan, a canal: Panama"
anagram_a = "Listen!"
anagram_b = "Silent"
sentence = "navigation system is online"
messy = "S3ct0r 7 cl34r!"
print(is_palindrome(clean_text(palindrome_text)))
print(are_anagrams(anagram_a, anagram_b))
print(reverse_words(sentence))
print(clean_text(messy))

Output

True
True
online is system navigation
sctrclr