Stefan Behnel wrote:
> Dag stumbled over a problem with the str/bytes/unicode split.
>
> http://trac.cython.org/cython_trac/ticket/412
>
> Since str literals no longer start out as char*, the following no longer
> works:
>
> cdef int i = 'x' # this works
>
> if i == 'x': # this doesn't
> print True
>
> The problem is that the comparison considers 'x' a Python string and thus
> coerces i to a Python int for comparison, which obviously fails.
>
> There are a a couple of ways to deal with this:
>
> 1) disallow unprefixed char literals also in a C context and require users
> to write
>
> cdef int i = c'x'
>
> if i == c'x':
>
> 2) special case this everywhere we need it, i.e. currently in
> StringNode.coerce_to(<C int>) and then also in BinopNode
>
> 3) let single-char str literals start out as C 'char' type and only coerce
> to Python str at need
>
>
> Personally, I would prefer either 1) or 3), the latter likely being more
> convenient but potentially introducing new pitfalls elsewhere (to be seen).
... like this, for example:
cdef char* s = 'x'
print s == 'x'
What is this code even supposed to mean?
It currently prints 'True', but that's only obvious when you know some
magic internals about Cython's string handling.
Stefan
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