Pablo Acosta added the comment:

I will correct myself one more time (hopefully the last):



        while b:
                a, b = b, round(a % b, 10)
        return a



a       b       fractions.gcd           proposed_algorithm
----------------------------------------------------------
48      18      6                       6
3       4       1                       1
2.7     107.3   8.881784197001252e-16   0.1
200.1   333     2.842170943040401e-14   0.3
0.05    0.02    3.469446951953614e-18   0.01

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<http://bugs.python.org/issue21712>
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