Created
October 1, 2011 21:25
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Sieve of Eratosthenes in Python
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| def primes(maximum): | |
| discarded = set() | |
| was_discarded = discarded.__contains__ | |
| discard_all = discarded.update | |
| limit = maximum + 1 | |
| yield 2 | |
| for m in xrange(3, limit, 2): | |
| if not was_discarded(m): | |
| yield m | |
| discard_all(xrange(m * 2, limit, m)) |
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BTW, "web scale" this: https://gist.github.com/1256699 :c)