What happens when I instantiate class in Python?
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by Konstantin
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Published on 2010-05-05T06:39:20Z
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2010/05/05
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Could you clarify some ideas behind Python classes and class instances?
Consider this:
class A():
name = 'A'
a = A()
a.name = 'B' # point 1 (instance of class A is used here)
print a.name
print A.name
prints:
B
A
if instead in point 1 I use class name, output is different:
A.name = 'B' # point 1 (updated, class A itself is used here)
prints:
B
B
Even if classes in Python were some kind of prototype for class instances, I'd expect already created instances to remain intact, i.e. output like this:
A
B
Can you explain what is actually going on?
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