Why Python don't accept 03 as a number?

[jfong at ms4.hinet.net]

Chris Angelico於 2018年12月10日星期一 UTC+8下午6時17分14秒寫道：
> On Mon, Dec 10, 2018 at 9:11 PM Antoon Pardon <antoon.pardon at vub.be> wrote:
> >
> > On 10/12/18 11:03, Chris Angelico wrote:
> > > Considering that, in a problem of that description, neither S nor M
> > > may represent zero, I don't think there's a problem here.
> >
> > Not all such problems have that condition.
> 
> They should. Every published set of problems that I've ever solved by
> hand has. I went searching online for some, and found this page:
> 
> http://puzzlepicnic.com/genre?alphametic
> 
> which clearly states that exact restriction. The implication is that
> you're solving a puzzle in arithmetic (usually addition or long
> multiplication), and it is *exactly* as you would have written it with
> digits, save that the digits have been replaced with letters (and
> carries have been omitted, since that'd make it too easy). You
> wouldn't write a leading zero on a number in standard grade-school
> arithmetic, so you also won't use a leading zero in anything here.
> 
> ChrisA

All I know is that when I write a number 03, there is no any human being will say it's an illegal number.

I prefer to buy the reason that this restriction was bring in is because of the puzzle's author know it will cause trouble without this, not because of our written habit.

--Jach