Literary-Python-for-beginners/exercises_loop.py

# These exercises correspond to the tutorial on https://www.anaisberck.be/python-loops/
### Exercise 1. Print a list of words of the song
# + next to each word its position in the sentence

# Prince, Purple Rain (using a hashtag = making a comment)
song = "I never meant to cause you any sorrow\n \
I never meant to cause you any pain\n \
I only wanted to one time to see you laughing\n \
I only wanted to see you\n \
Laughing in the purple rain."

# each word has a unique number
pos = 0
words = song.split()

for word in words:
    print(word, pos)
    pos += 1

# index of words, using string method index()
for word in words:
    print(word, song.index(word))


### Exercise 2: rewrite song by copying words with r to the beginning of the song
words_with_r = []
for word in words:
    if 'r' in word:
        words_with_r.append(word)
new_text = words_with_r + words
print(' '.join(new_text))

### Exercise 3: create an Anaerobe of the song (remove all r’s)
new_song = []
for word in words:
    if 'r' in word:
        word = word.replace('r','')
        new_song.append(word)
    else:
        new_song.append(word)
print(' '.join(new_song))