Python absolutely does have private members. If a member starts with two underscores, its class name (and an underscore) is prefixed to the member name, essentially resulting in the same behavior as a private modifier. (Although there are ways to circumvent this in Python, there are also ways to access private fields in most other languages.)

But even if that were true, that wouldn't mean that accessibility modifiers are unnecessary in other languages. Python is a certain language with certain idioms, and other languages are more or less OOP and hence some constructs that might not make sense in Python definitely make sense elsewhere.