os.path.isfile

[Erik]

On 12/02/17 23:56, Erik wrote:
>>>> r"hello \the" "worl\d"
> 'hello \\theworl\\d'
>
> Slightly surprising. The concatenated string adopts the initial string's
> 'rawness'.
>
>>>> "hello \the" r"worl\d" "\t"
> 'hello \theworl\\d\t'
>
> The initial string is not raw, the following string is. The string
> following _that_ becomes raw too.

That's clearly wrong - I mean the final string does _not_ become raw 
even though it follows a raw string (my point was that the previous 
example shows a non-raw string becoming raw because it follows a raw 
string).

E.