1 files changed, 40 insertions, 0 deletions
diff --git a/challenge-254/steven-wilson/python/ch-02.py b/challenge-254/steven-wilson/python/ch-02.py
new file mode 100644
index 0000000000..9a9fc09f62
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+++ b/challenge-254/steven-wilson/python/ch-02.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+
+VOWELS = set('aeiou')
+
+
+def reverse_vowels(string):
+    ''' Given a string reverse all the vowels (a, e, i, o, u) and return
+    resulting string.
+
+    >>> reverse_vowels('Raku')
+    'Ruka'
+    >>> reverse_vowels('Perl')
+    'Perl'
+    >>> reverse_vowels('Julia')
+    'Jaliu'
+    >>> reverse_vowels('Uiua')
+    'Auiu'
+    '''
+    string = string.lower()
+    indexes = []
+    cs = []
+    for index, c in enumerate(string):
+        if c in VOWELS:
+            indexes.append(index)
+            cs.append(c)
+
+    if len(indexes) < 2:
+        return string.title()
+    else:
+        characters = list(string)
+        for index in indexes:
+            characters[index] = cs.pop()
+        return ''.join(characters).title()
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()