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rounding - round down to 2 decimal in python

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

a = 28.266
print round(a, 2)

28.27

But the expected value is 28.26 only.

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Seems like you need the floor:

import math
math.floor(a * 100)/100.0

# 28.26

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