[Python-ideas] 1_000_000

[Bruce Leban]

I'm opposed to changing int so that int('123_456') ignores the _ as that
will change the behavior of existing code and could break apps.

Alternatively, if you want to change int how about int('123_456',
separator='_') ignores the _. That would also admit int('123,456',
separator=',')

--- Bruce
*
*


On Fri, May 6, 2011 at 4:41 PM, MRAB <python at mrabarnett.plus.com> wrote:

> On 06/05/2011 23:51, Cameron Simpson wrote:
>
>> On 06May2011 15:40, Ethan Furman<ethan at stoneleaf.us>  wrote:
>> | Bruce Leban wrote:
>> |>Is _ just ignored in numbers or are there more complex rules?
>> |>
>> |>     * 1_2345_6789  (can I use groups of other sizes instead?)
>> |>     * 1_2_3_4_5  (ditto)
>> |>     * 1_234_6789  (do all the groups need to be the same size?)
>> |>     * 1_   (must the _ only be in between 2 digits?)
>> |>     * 1__234   (what about multiple _s?)
>> |>     * 9.876_543_210   (can it be used to the right of the decimal
>> point?)
>> |>     * 0xFEFF_0042   (can it be used in hex, octal or binary numbers?)
>> |>     * int('123_456')   (do other functions accept this syntax too?)
>> |
>> | I would say it's ignored.  Have the rule be something like
>> | number_string.replace('_','').
>> |
>> | The only wrinkle is that currently '_1' is usable name, and that
>> | should probably be disallowed if the above change took place.
>> |
>> | I'm +1 on the idea.
>>
>> Personally I'm be for ignoring the _ also, save that I would forbid it
>> at the start or end, so no _1 or 1_.
>>
>> And I would permit it in hex code etc.
>>
>> I'm +0.5, myself.
>>
>>  As far as I remember, Ada also permits it, but has the rule that it can
> occur only between digits. If we follow that, then:
>
>    1_2345_6789 => Yes
>    1_2_3_4_5 => Yes
>    1_234_6789 => Yes
>    1_ => No
>    _1 => No
>    1__234 => No
>    9.876_543_210 => Yes
>    9._876_543_210 => No
>    9_.876_543_210 => No
>    0xFEFF_0042 => Yes
>    int('123_456') => Yes
>
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