# Calculating square roots by Newton's method, inspired by SICP# http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-10.html#%_sec_1.1.7def sqrt(x):def average(a, b):return (a + b) / 2.0def is_good_enough(guess):return (abs((guess * guess) - x) < 0.001)def improve(guess):return average(guess, x / guess)def sqrt_iter(guess):if is_good_enough(guess):return guesselse:return sqrt_iter(improve(guess))return sqrt_iter(1.0)ans = sqrt(9)
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