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Fast prime factorization using the msieve library

Project description

Pysieve is a simple wrapper of the msieve prime factorization library. It basically gives you a fast factor command and some utilities.

For now it is only tested on OSX with python 2.6 and msieve146 but it should work on Linux as well. It assumes that the msieve library is installed in a standard location (i.e /usr/local/lib, /usr/lib or on OSX with macports /opt/local/lib)

Functions in the package

  • factor(n): returns a list of the prime factors of n
  • dfactor(n): returns a list of distinct prime factors of n (no duplicates)
  • facExponents(n): returns a list of tuples, each containing a prime factor of n and its exponent


  • _pysieve is installed as seperate package. I somehow can’t
    define it to be a subpackage of pysieve (like pysieve._pysieve)


The msieve library can be downloaded at

Project details

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Files for PySieve, version 0.5.1
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