> What would "{} {}".partial_format({}) return?
`str.partial_format()` was proposed exactly to avoid such tricks.

> It is not possible to implement a "safe" variant of str.format(),
> because in difference to Template it can call arbitrary code

If you read the documentation of `Template.safe_substitute()`, you can read also this function is not safe at all.

But Python, for example, does not implement private class attributes. Because Python is for adult and consciousness people, no?