For example, this code is Python:

a = object()
a.b = 3

throws AttributeError: 'object' object has no attribute 'b'

But, this piece of code:

class c(object): pass
a = c()
a.b = 3

is just fine. Why can I assign property b, when class x does not have that property? How can I make my classes have only properties defined?

python class object properties
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