David Mertz added the comment:
Raymond wrote:
> The idea is that the method would return a new counter instance
> and leave the existing instance untouched.
Your own first example suggested:
c /= sum(c.values())
That would suggest an inplace modification. But even if it's not that, but
creating a new object, that doesn't make much difference to the end user who
has rebound the name `c`.
Likewise, I think users would be somewhat tempted by:
c = c.scale_by(1.0/c.total) # My property/attribute suggestion
This would present the same attractive nuisance. If the interface was the
slightly less friendly:
freqs = {k:v/c.total for k, v in c.items()}
I think there would be far less temptation to rebind the same name
unintentionally.
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<http://bugs.python.org/issue25478>
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