[issue38481] Class static property not static

[楚艺]

New submission from 楚艺 <1090217062 at qq.com>:

code:
------------------------------------------------------------------
    class D:
        num = 0
        
        def __init__(self):
            self.num += 1
            print('D num', self.num)

    for i in range(5):
        D()
---------------------------------------------------------------
console print:
---------------------------------------------------------------
Connected to pydev debugger (build 183.5429.31)
D num 1
D num 1
D num 1
D num 1
D num 1

Process finished with exit code 0

----------
components: Windows
messages: 354702
nosy: chuyi, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Class static property not static
type: behavior
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38481>
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