Why Python don't accept 03 as a number?

[Antoon Pardon]

On 10/12/18 11:03, Chris Angelico wrote:
> On Mon, Dec 10, 2018 at 9:01 PM Antoon Pardon <antoon.pardon at vub.be> wrote:
>> On 8/12/18 06:00, Cameron Simpson wrote:
>>> On 07Dec2018 20:24, Jach Fong <jfong at ms4.hinet.net> wrote:
>>>> Ian at 2018/12/8 UTC+8 AM11:28:34 wrote:
>>>>> What is it exactly that you're trying to accomplish with this? Perhaps
>>>>> there's a better way than using eval.
>>>> This problem comes from solving a word puzzle,
>>>>    ab + aa + cd == ce
>>>> Each character will be translate to a digit and evaluate the
>>>> correctness,
>>>>    03 + 00 + 15 == 18
>>> Then you should be evaluating the digits and assembling values from
>>> them. Not trying to shoehorn a string through something that _might_
>>> accept this string and do what you want. In Python 2 it will accept
>>> your string and not do what you want; at least in Python 3 it doesn't
>>> accept your string.
>>>
>>> My point here is that the structure of your puzzle doesn't map
>>> directly into a naive python statement, and you shouldn't be
>>> pretending it might.
>> How do you figure? As far as I understand he is trying to solve this kind of puzzle:
>>
>>     SEND
>>     MORE
>>  +  ————
>>    MONEY
>>
>> Where every letter is to be replaced by a digit in such a way that the sum checks out. Sure trying to
>> solve this by starting with the string: "SEND + MORE == MONEY" and doing replaces until eval comes up
>> with true is not very sofisticated but I wouldn't call it shoehorning either.
>>
> 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.

-- 
Antoon.