Compared to your program, I think the key to mine is to divide by "limit" before taking the log. In this way, things below the "limit" go to the next lower integer.
I think that instead of having 'step' and 'base', there should be a single
value which would be 1000 or 1024.
import math
def MakeFormat(prefixes, step, limit, base):
def Format(n, suffix='B', places=2):
if abs(n) < limit:
if n == int(n):
return "%s %s" % (n, suffix)
else:
return "%.1f %s" % (n, suffix)
magnitude = math.log(abs(n) / limit, base) / step
magnitude = min(int(magnitude)+1, len(prefixes)-1)
return '%.1f %s%s' % (
float(n) / base ** (magnitude * step),
prefixes[magnitude], suffix)
return Format
DecimalFormat = MakeFormat(
prefixes = ['', 'k', 'M', 'G', 'T'],
step = 3,
limit = 100,
base = 10)
BinaryFormat = MakeFormat(
prefixes = ['', 'ki', 'Mi', 'Gi', 'Ti'],
step = 10,
limit = 100,
base = 2)
values = [0, 1, 23.5, 100, 1000/3, 500, 1000000, 12.345e9]
print [DecimalFormat(v) for v in values]
print [BinaryFormat(v) for v in values]
pgpJgQXD2YDZW.pgp
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