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copied!<p>You're using one element lists; If you want to perform that calculation specifically, just remove the braces. I'll assume that you actually do have multi-valued lists. A reasonable solution is to combine <code>map()</code>, which applies a function to each element in one or more lists, as well as some of the functions from the <code>operator</code> module, which turn many python operators (like <code>+</code> and <code>-</code>) into functions.</p> <p>First well just set up some lists.</p> <pre><code>>>> import random >>> d1 = [random.randrange(10) for ignored in range(10)] >>> d2 = [random.randrange(10) for ignored in range(10)] >>> c1 = [random.randrange(10) for ignored in range(10)] >>> c2 = [random.randrange(10) for ignored in range(10)] >>> c1 [1, 1, 7, 5, 5, 7, 4, 0, 7, 2] >>> c2 [9, 2, 7, 7, 1, 1, 9, 3, 6, 8] >>> d1 [0, 3, 4, 8, 9, 0, 7, 1, 6, 5] >>> d2 [3, 9, 5, 2, 1, 9, 2, 7, 9, 5] </code></pre> <p>Next we just replace each of your operations into a <code>map</code> call to the corresponding <code>operator.*</code></p> <pre><code>>>> import operator >>> x = map(operator.sub, d2, c2) >>> y = map(operator.sub, d2, c2) >>> z = map(operator.mul, x, x) >>> w = map(operator.mul, y, y) >>> import math >>> answer = map(math.sqrt, map(operator.add, z, w)) >>> print answer [8.48528137423857, 9.899494936611665, 2.8284271247461903, 7.0710678118654755, 0.0, 11.313708498984761, 9.899494936611665, 5.656854249492381, 4.242640687119285, 4.242640687119285] >>> </code></pre>

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