2 files changed, 53 insertions, 0 deletions
diff --git a/challenge-273/steven-wilson/python/ch-1.py b/challenge-273/steven-wilson/python/ch-1.py
new file mode 100644
index 0000000000..ef93272112
--- /dev/null
+++ b/challenge-273/steven-wilson/python/ch-1.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+import math
+
+
+def percentage_of_character(string, character):
+    ''' Given a string and a character, return the percentage, nearest whole,
+    of given character in the given string.
+    >>> percentage_of_character("perl", "e")
+    25
+    >>> percentage_of_character("java", "a")
+    50
+    >>> percentage_of_character("python", "m")
+    0
+    >>> percentage_of_character("ada", "a")
+    67
+    >>> percentage_of_character("ballerina", "l")
+    22
+    >>> percentage_of_character("analitik", "k")
+    13
+    '''
+    return math.floor((string.count(character) / len(string) * 100) + 0.5)
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod(verbose=True)
diff --git a/challenge-273/steven-wilson/python/ch-2.py b/challenge-273/steven-wilson/python/ch-2.py
new file mode 100644
index 0000000000..c8e3c675b4
--- /dev/null
+++ b/challenge-273/steven-wilson/python/ch-2.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+
+
+def b_after_a(string):
+    ''' Given  a string, return true if there is at least one b, and no a
+    appears after the first b.
+    >>> b_after_a("aabb")
+    True
+    >>> b_after_a("abab")
+    False
+    >>> b_after_a("aaa")
+    False
+    >>> b_after_a("bbb")
+    True
+    '''
+    first_b_index = string.find("b")
+    if first_b_index != -1 and "a" not in string[first_b_index:]:
+        return True
+    return False
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod(verbose=True)