[Tutor] Is nesting functions only for data hiding overkill?

[James Hartley]

Yes, nesting functions is valuable & necessary for closures and wrapping
functions for creating properties.  But is nesting, simply for hiding data,
a preferred solution?  I have a number of member functions which are
prefaced with underscores pointing out that they should not be called by
client code.  Is nesting considered Pythonic?

Thanks!