Steven D'Aprano added the comment:
On Sun, Sep 27, 2015 at 04:17:45PM +0000, R. David Murray wrote:
>
> I also want "detect if there are any surrogates".
I think that's useful enough it should be a str method. Here's a
pure-Python implementation:
def is_surrogate(s):
return any(0xD800 <= ord(c) <= 0xDFFF for c in s)
The actual Flexible String Representation implementation can be even
more efficient. All-ASCII and all-Latin1 strings cannot possibly include
surrogates, so is_surrogate will be a constant-time operation.
(If we care about making this a constant-time operation for all
strings, the constructor could set a flag on the string object. Since
the constructor has to walk the string anyway, I don't think that will
cost much time-wise.)
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