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diff --git a/challenge-245/steven-wilson/python/ch-1.py b/challenge-245/steven-wilson/python/ch-1.py
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+++ b/challenge-245/steven-wilson/python/ch-1.py
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+#!/usr/bin/env python3
+
+
+def sort_language(language, popularity):
+    ''' Given 2 arrays: languages and popularity. Sorts the language
+    based on popularity.
+    >>> sort_language(('perl', 'c', 'python'), (2, 1, 3))
+    ('c', 'perl', 'python')
+    >>> sort_language(('c++', 'haskell', 'java'), (1, 3, 2))
+    ('c++', 'java', 'haskell')
+    '''
+    if len(language) != len(popularity):
+        raise ValueError("Lengths of 'language' and 'popularity' must be the same.")
+    language_popularity = dict(zip(language, popularity))
+    return tuple(sorted(language, key=lambda l: language_popularity.get(l)))
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()