On 06/06/2017 12:51 PM, Chris Angelico wrote:
> Firstly, is there a reason for the empty string to not be surrounded
> with quotes? The source code, AIUI, is this:
>
> x = PyOS_string_to_double(s, (char **)&end, NULL);
> if (end != last) {
> PyErr_Format(PyExc_ValueError,
> "could not convert string to float: "
> "%R", obj);
> return NULL;
> }
>
> which, by my reading, should always be repr'ing the string.
>
The confusing part is that if the string is empty, then the line
if (end != last) {
does not evaluate to true. So you never enter that part of the if
statement. Instead you get here:
else if (x == -1.0 && PyErr_Occurred()) {
return NULL;
}
(You can check in a debugger that this happens.)
Cheers,
Thomas
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