Rawest raw string literals

[MRAB]

On 2017-04-20 17:40, Grant Edwards wrote:
> On 2017-04-20, Mikhail V <mikhailwas at gmail.com> wrote:
>> On 20 April 2017 at 17:59, Grant Edwards <grant.b.edwards at gmail.com> wrote:
>>> On 2017-04-20, Mikhail V <mikhailwas at gmail.com> wrote:
>>>> Quite often I need raw string literals for concatenating console commands.
>>>> I want to input them exactly as they are in python sources.
>>>>
>>>> There is r"" string, but it is obviously not enough because e.g. this:
>>>> s = r"ffmpeg -i  "\\server-01\D\SER_Bigl.mpg" "
>>>
>>>    s = r'ffmpeg -i  "\\server-01\D\SER_Bigl.mpg" '
>>>
>>> Does that do what you want?
>>
>> Yes but it still needs to watch out if there is no ' inside or vice
>> versa with " characters if use r"". I would like a universal
>> solution.
> 
> IOW, you want something that just reads your mind.
> 
> How can there exist a "universal solution" even in theory?
> 
> There has to be some sort of "end of literal" terminator character
> sequence.  That means there has to be some sort of escaping mechanism
> when that "end of literal" sequence appears in the literal itself.
> 
There _is_ a "universal solution"; it's called a Hollerith constant. :-)