Hello, Sage community!
With the upcoming migration of Sage from Python 2 to Python 3 (really soon, let us hope!), there are some testings I have trying, and I have noticed that the "underscored integer literals", like "1_000_000" are not preparsed by Sage. For example,
preparse('1_000_000 + 3')
results in
'1_000_000 + Integer(3)'
However,
preparse('1000000 + 3')
returns
'Integer(1000000) + Integer(3)'
On the other hand, if I write
type(1_000_000 + 3)
the result is
<class 'sage.rings.integer.Integer'>
which is great, but
type(1_000_000 + 3_000)
instead gives me
<class 'int'>
Finally,
type(1000000 + 3000)
gives us
<class 'sage.rings.integer.Integer'>
I know one of the reasons for the Integer type was to allow divisions like 3/2 to return the float 1.5 even with Python 2, which would return (very disturbingly) 1, in other case. However, Python 3 integers already do this. Besides what I mentioned, I haven't found any difference in behavior.
So I was wondering: Is there any disadvantage in Sage not being preparsing this type of literals?
