alefajnie wrote:

class B:
  this_is_common_for_all_instances = []

  def __init__(self, v):
    self.this_is_common_for_all_instances.append(v)


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now I can create some instances of B, but all of them have the same
array, why

Because you didn't reassign the attribute 'this_is_common_for_all_instances', but appended to it.

and how create array in class - normal array, "private variable"

1) it's called a list, not an array
2) you do that in the __init__ method: self.blabla = []
3) still, it won't be a "private" attribute, just an instance attribute
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