Private variable and @property in variable inspector on PyCharm

Hi, I would like to know why PyCharm automatically instantiate my private variable when I want to instantiate them with @property.

For example:

class Foo:

    def __init__(self):

        variable_ = []

    @property

    def variable(self):

        if len(self.variable_) == 0:

            self.variable_ = [1,2,3,4]

        return self.variable.copy()

If I run my code and instantiate the class, I will see that my variable_ = [1,2,3,4] even if I did not call the variable setter.

So, I wanted to know why it is not variable_ = []

Thank you very much for your help !