[Tutor] Why begin a function name with an underscore

[罗健忠]

>
> It's better to use the single-leading-underscore convention, _internal.
> This isn't name mangled at all; it just indicates to others to "be careful
> with this, it's an internal implementation detail; don't touch it if you
> don't *fully* understand it". It's only a convention though.


you can read some other info for naming in python here:
http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html#naming

On 28 August 2012 08:26, Richard D. Moores <rdmoores at gmail.com> wrote:

> I've been going through Steven D'Aprano's pyprimes
> (<http://pypi.python.org/pypi/pyprimes/0.1.1a>) and have many
> questions. One is why begin a function name with an underscore. He has
> several functions that do this. Two are:
>
> def _validate_int(obj):
>     """Raise an exception if obj is not an integer."""
>     m = int(obj + 0)  # May raise TypeError.
>     if obj != m:
>         raise ValueError('expected an integer but got %r' % obj)
>
>
> def _validate_num(obj):
>     """Raise an exception if obj is not a finite real number."""
>     m = obj + 0  # May raise TypeError.
>     if not isfinite(m):
>         raise ValueError('expected a finite real number but got %r' % obj)
>
> I'm stealing these for their usefulness. But why the underscores?
>
> I think I've also seen elsewhere variable names that also begin with
> an underscore, e.g., _a .
>
> Dick Moores
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