Solutions for exercises on loops

exercises_loop.py

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+### 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))