Added power

test_unnecessarymath.py

@@ -8,3 +8,8 @@ def test_sqrt():
     assert um.sqrt(1.) == 1.
     assert um.sqrt(0.) == 0.
     assert um.sqrt(4.) == 2.
+
+def power_test():
+	assert um.power(3, 3) == 27
+	assert um.power(2, 4) == 16
+	assert um.power(5, 3) == 125
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unnecessarymath.py

@@ -23,3 +23,14 @@ def square(x):
     16.0
     """
     return x * x
+
+def power(x, y):
+    """
+    Evaluates a number x to the power y
+
+    >>> power(2, 3)
+    8
+    >>> power(3, 2)
+    9
+    """
+    return x ** y
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