On Friday, July 14, 2017 at 10:08:35 AM UTC-5, Edward K. Ream wrote:

Only two lines of code were changed, but* they are major changes to Leo's 
> read/write code*.
>

I also refactored two sections into a new method: 
fc.compute_attribute_bits.  All such refactorings are much safer now that 
pyflakes and pylint check my every move.

Imo, section references is clearly the very worst idea that the 
usually-brilliant Donald Knuth ever had. They are wretched engineering:

- They obscure knowledge of what data functions/methods use and return.
- Data can unexpected "bleed" into surrounding code.
- They can't be unit tested properly.

As a result, I am gradually converting such evil sections into proper 
methods. Doing so allows *encapsulated* code improvements.  For example, I 
replaced string concatenation using the attr var by list append using the 
bits var.  This would be dangerous in a section definition.  But pyflakes 
will reliably check this in a function def. As a result, the supremely 
important fc.putVnode is now simpler and clearer.

Edward

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