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python list 插入重复元素不会覆盖，见以下测试：

Python 3.10.12 (main) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a = [1, 2, 3]
>>> print(a)
[1, 2, 3]
>>> a.append(4)
>>> print(a)
[1, 2, 3, 4]
>>> a.append(2)
>>> print(a)
[1, 2, 3, 4, 2]
>>> a.append('6')
>>> print(a)
[1, 2, 3, 4, 2, '6']
>>> a.append('6')
>>> print(a)
[1, 2, 3, 4, 2, '6', '6']

如果需要重复元素不被添加，需自行判断元素是否存在，见以下demo：

if item not in object_list:
	object_list.append(item)

python 列表基本操作