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#23949: Improve tuple unpacking error messages.

Browse source 
Patch by Arnon Yaari.
This commit is contained in:
R David Murray 2015-04-15 17:08:45 -04:00
parent 13a6ee0af4
commit 4171bbe687
3 changed files with 26 additions and 9 deletions
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2
Lib/test/test_unpack.py
View file

@ -76,7 +76,7 @@
>>> a, b, c, d = Seq()
Traceback (most recent call last):
...
ValueError: need more than 3 values to unpack
ValueError: not enough values to unpack (expected 4, got 3)
Unpacking sequence too long

9
Lib/test/test_unpack_ex.py
View file

@ -85,7 +85,14 @@
>>> a, *b, c, d, e = Seq()
Traceback (most recent call last):
...
ValueError: need more than 3 values to unpack
ValueError: not enough values to unpack (expected at least 4, got 3)
Unpacking sequence too short and target appears last
>>> a, b, c, d, *e = Seq()
Traceback (most recent call last):
...
ValueError: not enough values to unpack (expected at least 4, got 3)
Unpacking a sequence where the test for too long raises a different kind of
error

24
Python/ceval.c
View file

@ -3825,9 +3825,17 @@ unpack_iterable(PyObject *v, int argcnt, int argcntafter, PyObject **sp)
if (w == NULL) {
/* Iterator done, via error or exhaustion. */
if (!PyErr_Occurred()) {
PyErr_Format(PyExc_ValueError,
"need more than %d value%s to unpack",
i, i == 1 ? "" : "s");
if (argcntafter == -1) {
PyErr_Format(PyExc_ValueError,
"not enough values to unpack (expected %d, got %d)",
argcnt, i);
}
else {
PyErr_Format(PyExc_ValueError,
"not enough values to unpack "
"(expected at least %d, got %d)",
argcnt + argcntafter, i);
}
}
goto Error;
}
@ -3844,8 +3852,9 @@ unpack_iterable(PyObject *v, int argcnt, int argcntafter, PyObject **sp)
return 1;
}
Py_DECREF(w);
PyErr_Format(PyExc_ValueError, "too many values to unpack "
"(expected %d)", argcnt);
PyErr_Format(PyExc_ValueError,
"too many values to unpack (expected %d)",
argcnt);
goto Error;
}
@ -3857,8 +3866,9 @@ unpack_iterable(PyObject *v, int argcnt, int argcntafter, PyObject **sp)
ll = PyList_GET_SIZE(l);
if (ll < argcntafter) {
PyErr_Format(PyExc_ValueError, "need more than %zd values to unpack",
argcnt + ll);
PyErr_Format(PyExc_ValueError,
"not enough values to unpack (expected at least %d, got %zd)",
argcnt + argcntafter, argcnt + ll);
goto Error;
}