MRAB at 2018/12/8 UTC+8 AM10:04:51 wrote:
> Before Python 3, a leading 0 in an integer literal would indicate an 
> octal (base 8) number.

So, the reason is historical.

> The old form is now invalid in order to reduce the chance of bugs.

I encounter this problem on trying to do something like this:
    eval('03 + 00 + 15')
It takes me some efforts to get rid of those leading zeros:-(

Hope someday 03 can be accepted as a valid decimal number in Python 3.

Thank you for explaining.

--Jach


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