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class asnset(object):
"""a set-like objet for containing sets of ASN values."""
v = set()
def __init__(self, init=None):
"""
May be initialized from a comma separated list of positive integers.
"""
if init:
self.v = set(int(x) for x in init.split(',') if x.strip() != '')
if any([x for x in self.v if x < 0]):
raise ValueError, "can't contain negative values."
def __str__(self):
return ','.join(str(x) for x in sorted(self.v))
def __iter__(self):
return iter(self.v)
def add(self, n):
assert isinstance(n, int)
assert n > 0
self.v.add(n)
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