Perfect numbers: Difference between revisions
→{{header|Python}}: replaced reduce(add) with sum
(→{{header|Python}}: Added a slightly faster variant) |
(→{{header|Python}}: replaced reduce(add) with sum) |
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Or, a little faster (by restricting the search space):
<lang python>from
from math import (sqrt)
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# perfect::
def perfect(n):
lows = filter(
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xrange(1, 1 + int(sqrt(n)))
)
return (1 < n) and
lows + concatMap(
lambda x: (
lambda y=n / x: [y
)()
)(lows)
) / 2
)
# GENERIC
# concatMap
def concatMap(f):
return lambda xs: (
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