Hi,
I have this silly piece of code that I am experimenting with:
#!/usr/bin/python
class Person:
population = 0
def __init__(self, name):
self.name = name
print '%s has been added' %self.name
Person.population += 1
def __del__(self):
print '%s is leaving' % self.name
Person.population -= 1
print 'population = %d' %Person.population
p = Person('Jean')
d = Person('Michael')
Output:
Jean has been added
Michael has been added
Michael is leaving
population = 1
Jean is leaving
*Exception exceptions.AttributeError: "'NoneType' object has no attribute
'population'" in <bound method Person.__del__ of <__main__.Person instance
at 0xb7dadacc>> ignored*
So once all objects have been destroyed, an exception is triggered on class
variable 'population'.
Any more logical explanation and work around? I just need to understand what
python is doing here
Thx
Blaise
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