def sqrt(val, err=0.000001): if val <= 0: return 0 if err <= 0: err = 0.000001 guess = 1.0 pguess = 0 while abs(guess * guess - val) > err and pguess != guess: pguess = guess guess = (guess + val / guess) / 2.0 return guess print sqrt(1) print sqrt(4) print sqrt(9) print sqrt(2, err=0.000000001)
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