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gh-86018 Inconsistent errors for JSON-encoding NaNs with allow_nan=False #99172

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gh-86018 Inconsistent errors for JSON-encoding NaNs with allow_nan=False #99172

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gh-86018 Inconsistent errors for JSON-encoding NaNs with allow_nan=False
WillAyd Nov 6, 2022
0d2798e
suggestions
WillAyd Nov 7, 2022
4b8516c
simplified implementation
WillAyd Nov 7, 2022
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@WillAyd
WillAyd committed Nov 7, 2022
commit 0d2798e9d94f374499054a3b788e73ff26d22736
2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Library/2022-11-06-19-59-56.gh-issue-86018.xAt6g2.rst
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@@ -1 +1 @@
+ Fix issue where the error messages for :func:`json.dump` and :func:`json.dumps` were inconsistent when serializing non-finite values with ``allow_nan=False``
+ Fix issue where the error messages for :meth:`json.dump` and :meth:`json.dumps` were inconsistent when serializing non-finite values with ``allow_nan=False``
9 changes: 3 additions & 6 deletions Modules/_json.c
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Expand Up @@ -1325,21 +1325,18 @@ encoder_encode_float(PyEncoderObject *s, PyObject *obj)
double i = PyFloat_AS_DOUBLE(obj);
if (!Py_IS_FINITE(i)) {
char* value;
char *py_value;
if (i > 0) {
value = "Infinity";
py_value = "inf";
} else if (i < 0) {
value = "-Infinity";
py_value = "-inf";
} else {
value = "NaN";
py_value = "nan";
}

if (!s->allow_nan) {
char message[55] = "Out of range float values are not JSON compliant: ";
PyErr_SetString(PyExc_ValueError, strcat(message, py_value));
PyErr_Format(PyExc_ValueError,
"Out of range float values are not JSON compliant: %S",
obj);
return NULL;
} else {
return PyUnicode_FromString(value);
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