On Feb 11, 2016, at 00:22, Georg Brandl <g.brandl@gmx.net> wrote:

Allowing underscores in string arguments to the ``Decimal`` constructor.  It
 could be argued that these are akin to literals, since there is no Decimal
 literal available (yet).

I'm +1 on this. Partly for consistency (see below)--but also, one of the use cases for Decimal is when you need more precision than float, meaning you'll often have even more digits to separate.

* Allowing underscores in string arguments to ``int()`` with base argument 0,
 ``float()`` and ``complex()``.

+1, because these are actually defined in terms of literals. For example, under int, "Base 0 means to interpret exactly as a code literal". This isn't actually quite true, because "-2" is not an integer literal but is accepted here--but see float for an example that *is* rigorously defined, and still defers to literal syntax and semantics.