Here is a bit of code:
class A:
def __init__(self, l=[]):
self.l = l
class B:
def __init__(self):
self.l = []
a1 = A()
a2 = A()
b1 = B()
b2 = B()
a1.l += ['a1']
a2.l += ['a2']
b1.l += ['b1']
b2.l += ['b2']
print 'a1:', a1.__dict__, '0x%08x' % abs(id(a1.l))
print 'a2:', a2.__dict__, '0x%08x' % abs(id(a2.l))
print 'b1:', b1.__dict__, '0x%08x' % abs(id(b1.l))
print 'b2:', b2.__dict__, '0x%08x' % abs(id(b2.l))
That gives:
a1: {'l': ['a1', 'a2']} 0x484db114
a2: {'l': ['a1', 'a2']} 0x484db114
b1: {'l': ['b1']} 0x484db174
b2: {'l': ['b2']} 0x484db2d4
This behaviour seems a bit strange, clearly list is class A is the same
objects for both instances and I'm wondering if this is correct?
Duncan
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