Question about idiomatic use of _ and private stuff.

[goodwolf]

On Feb 23, 5:12 pm, "Steven W. Orr" <ste... at syslang.net> wrote:
> I understand that two leading underscores in a class attribute make the
> attribute private. But I often see things that are coded up with one
> underscore. Unless I'm missing something, there's a idiom going on here.
>
> Why do people sometimes use one leading underscore?
>
> TIA
>
> --
> Time flies like the wind. Fruit flies like a banana. Stranger things have  .0.
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> steveo at syslang.net

One underscore stay for 'protected'. Protected in OOP means that the
attribute is hidden outside the class but visible for subclasses. In
python one undersore is only a good convention for say that the
attribute is protected.
So users will ignore attributes with initial undersocre. Users who
subclass must know of that attributes existence for prevent unwonted
overriding.

Sory for my english.