Permitting leading 0s may make it harder to port Python 2 projects to Python 3.
010 == 8 (Python 2) 010 == 10 (Python 3.x) SyntaxError is very important for porting code. So I'm -1 on permitting leading 0s for decimal numbers. I think original question is for leading 0s for only 0. Not for arbitrarily decimals. On Wed, Jul 22, 2015 at 2:21 AM, Antoon Pardon <antoon.par...@rece.vub.ac.be > wrote: > On 07/19/2015 07:39 AM, Steven D'Aprano wrote: > > In Python 2, integer literals with leading zeroes are treated as octal, > so > > 09 is a syntax error and 010 is 8. > > > > This is confusing to those not raised on C-style octal literals, so in > > Python 3 leading zeroes are prohibited in int literals. Octal is instead > > written using the prefix 0o, similar to hex 0x and binary 0b. > > > > Consequently Python 3 makes both 09 and 010 a syntax error. > > > > However there is one exception: zero itself is allowed any number of > leading > > zeroes, so 00000 is a legal way to write zero as a base-10 int literal. > > > > Does anyone use that (mis)feature? > > > > Yes. I like to sometime write numbers with leading zeros. > Sometimes these numbers represent codeblocks of a fixed > number of digits. Always writing those numbers with this > number of digits helps being aware of this. It is also > easier for when you need to know how many leading zero's > such a number has. > > > -- > https://mail.python.org/mailman/listinfo/python-list > -- INADA Naoki <songofaca...@gmail.com>
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