straton at lampsacos.demon.co.uk
Tue Aug 26 14:48:56 CEST 2008
Steven D'Aprano wrote:
> def SomeClass(object):
> _gridsize = 0.8
> The leading underscore tells callers that they change the attribute at
> their own risk.
> An even more Pythonic approach is to write your class that makes no
> assumptions about gridsize, and thus explicitly supports any reasonable
> grid size.
The parent class, makes no assumption about grid-size, and I have put
a great deal of functionality there.
The methods of the derived class that depend on a gridsize of 8mm are
mostly concerned with standard LaTeX glyphs (from a specific font)
at standard LaTeX sizes.
I am fitting a small subset of them into my grid by hand, in a
way that I don't think could be easily automated even if I use the
metric information. Not impossible, just too much hastle.
The general rationale of the project is 'pen-and-ink' algorithms
for arithmetic, on quadrille paper. It is to create figures that
will be imported into LaTeX later.
(By the way, it is perfectly easy to re-scale the figure after
the digits, carry-figures, and other glyphs are placed. So long
as you don't mind the font-size within the figure to
be out of kilter with the font-size of the main run of
I hope this explains why I have decided on a Read-only attribute, the
first one ever, apart from a quick try-out when I started with Python.
And that was when Guido was still in Amsterdam.
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