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Edit File : fact.py \| Size : 1.11 KB
#! /usr/bin/python2.7 # Factorize numbers. # The algorithm is not efficient, but easy to understand. # If there are large factors, it will take forever to find them, # because we try all odd numbers between 3 and sqrt(n)... import sys from math import sqrt def fact(n): if n < 1: raise ValueError('fact() argument should be >= 1') if n == 1: return [] # special case res = [] # Treat even factors special, so we can use i += 2 later while n % 2 == 0: res.append(2) n //= 2 # Try odd numbers up to sqrt(n) limit = sqrt(n+1) i = 3 while i <= limit: if n % i == 0: res.append(i) n //= i limit = sqrt(n+1) else: i += 2 if n != 1: res.append(n) return res def main(): if len(sys.argv) > 1: source = sys.argv[1:] else: source = iter(raw_input, '') for arg in source: try: n = int(arg) except ValueError: print arg, 'is not an integer' else: print n, fact(n) if __name__ == "__main__": main() Back

Edit File : fact.py | Size : 1.11 KB

#! /usr/bin/python2.7

# Factorize numbers.
# The algorithm is not efficient, but easy to understand.
# If there are large factors, it will take forever to find them,
# because we try all odd numbers between 3 and sqrt(n)...

import sys
from math import sqrt

def fact(n):
    if n < 1:
        raise ValueError('fact() argument should be >= 1')
    if n == 1:
        return []  # special case
    res = []
    # Treat even factors special, so we can use i += 2 later
    while n % 2 == 0:
        res.append(2)
        n //= 2
    # Try odd numbers up to sqrt(n)
    limit = sqrt(n+1)
    i = 3
    while i <= limit:
        if n % i == 0:
            res.append(i)
            n //= i
            limit = sqrt(n+1)
        else:
            i += 2
    if n != 1:
        res.append(n)
    return res

def main():
    if len(sys.argv) > 1:
        source = sys.argv[1:]
    else:
        source = iter(raw_input, '')
    for arg in source:
        try:
            n = int(arg)
        except ValueError:
            print arg, 'is not an integer'
        else:
            print n, fact(n)

if __name__ == "__main__":
    main()

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