round down to 2 decimal in python

Question

I need to round down and it should be two decimal places.
Tried the following,

a = 28.266
print round(a, 2)

28.27

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Answer 1

here's a simple function that isn't affected by float precision errors

def truncate_float(n, places):
    return int(n * (10 ** places)) / 10 ** places

Tests:

>>> truncate_float(28.266, 3)
28.266
>>> truncate_float(28.266, 2)
28.26
>>> truncate_float(28.266, 1)
28.2