[Python-ideas] Contraction for "for x in range()"

[Todd]

On Tue, Feb 14, 2017 at 4:41 PM, MRAB <python at mrabarnett.plus.com> wrote:

> On 2017-02-14 21:09, Zachary Ware wrote:
>
>> On Tue, Feb 14, 2017 at 3:06 PM, Mikhail V <mikhailwas at gmail.com> wrote:
>>
>>> I have a small syntax idea.
>>> In short, contraction of
>>>
>>> for x in range(a,b,c) :
>>>
>>> to
>>>
>>> for x in a,b,c :
>>>
>>> I really think there is something cute in it.
>>> So like a shortcut for range() which works only in for-in statement.
>>> So from syntactical POV, do you find it nice syntax?
>>> Visually it seems to me less bulky than range().
>>>
>>> Example:
>>>
>>> for x in 0,5 :
>>>     print (x)
>>>     for y in 0,10,2 :
>>>         print (y)
>>>         for z in 0, y+8 :
>>>             print (z)
>>>
>>
>> This is already valid and useful syntax, and thus a non-starter.
>>
>>    >>> for x in 0,5 :
>>    ...     print (x)
>>    ...     for y in 0,10,2 :
>>    ...         print (y)
>>    ...         for z in 0, y+8 :
>>    ...             print (z)
>>    ...
>>    0
>>    0
>>    0
>>    8
>>    10
>>    0
>>    18
>>    2
>>    0
>>    10
>>    5
>>    0
>>    0
>>    8
>>    10
>>    0
>>    18
>>    2
>>    0
>>    10
>>
>> The closest you could get without breaking existing code is [a:b:c]:
>
> for x in [0:5]:
>     print(x)
>     for y in [0:10:2]:
>         print(y)
>         for z in [0:y+8]:
>             print(z)
>
> What's more, that could be valid outside the 'for' loop too.
>
>
Guido has already rejected this syntax and several others.
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