Python – Rounding by quarter-intervals

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This is a general purpose solution which allows rounding to arbitrary resolutions. For your specific case, you just need to provide 0.25 as the resolution but other values are possible, as shown in the test cases.

def roundPartial (value, resolution):
    return round (value / resolution) * resolution

print "Rounding to quarters"
print roundPartial (10.38, 0.25)
print roundPartial (11.12, 0.25)
print roundPartial (5.24, 0.25)
print roundPartial (9.76, 0.25)

print "Rounding to tenths"
print roundPartial (9.74, 0.1)
print roundPartial (9.75, 0.1)
print roundPartial (9.76, 0.1)

print "Rounding to hundreds"
print roundPartial (987654321, 100)

This outputs:

Rounding to quarters
10.5
11.0
5.25
9.75
Rounding to tenths
9.7
9.8
9.8
Rounding to hundreds
987654300.0

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