class Foo:
	listElement = []
	def __init__(self):
		self.listElement.append('FooData')
		print self.listElement
class Bar(Foo):
	def __init__(self):
		self.listElement.append('BarData')
		print self.listElement

a = Foo()
b = Foo()
c = Bar()
d = Foo()

"""
What should be printed is:
---start---
['FooData']
['FooData']
['FooData']
['FooData']
---end---

Instead, it prints:
---start---
['FooData']
['FooData', 'FooData']
['FooData', 'FooData', 'FooData']
['FooData', 'FooData', 'FooData', 'FooData']
---end---
"""