Serhiy Storchaka added the comment:
The code in PyUnicode_Join() checks on overflow after making an addition.
sz += PyUnicode_GET_LENGTH(item);
item_maxchar = PyUnicode_MAX_CHAR_VALUE(item);
maxchar = Py_MAX(maxchar, item_maxchar);
if (i != 0)
sz += seplen;
if (sz < old_sz || sz > PY_SSIZE_T_MAX) {
PyErr_SetString(PyExc_OverflowError,
"join() result is too long for a Python string");
goto onError;
}
Maybe there are other cases.
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<http://bugs.python.org/issue29145>
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