[Python-Dev] PEP 498: Literal String Interpolation is ready for pronouncement

[Eric V. Smith]

> Actually, my current implementation doesn't use the lexer, although I
> suppose it could. I'm currently manually scanning the string, keeping
> track of strings and parens. To find the end of an expression, it looks
> for a '!', ':', or non-doubled '}', not inside of a string or (), [], or
> {}. There's a special case for '!=' so the bang isn't seen as ending the
> expression.

Ignore the part about non-doubled '}'. The actual description is:

To find the end of an expression, it looks for a '!', ':', or '}', not
inside of a string or (), [], or {}. There's a special case for '!=' so
the bang isn't seen as ending the expression.

Eric.