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bpo-30534: Fixed error messages when pass keyword arguments (#1901) 

to functions implemented in C that don't support this.

Also unified error messages for functions that don't take positional or keyword
arguments.
This commit is contained in:
Serhiy Storchaka 2017-06-06 18:45:22 +03:00 committed by GitHub
parent 5cefb6cfdd
commit 5eb788bf7f
5 changed files with 116 additions and 45 deletions
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60
Lib/test/test_call.py
View File

@ -1,4 +1,5 @@
import unittest
from test.support import cpython_only
# The test cases here cover several paths through the function calling
# code. They depend on the METH_XXX flag that is used to define a C
@ -33,9 +34,6 @@ class CFunctionCalls(unittest.TestCase):
else:
raise RuntimeError
def test_varargs0_kw(self):
self.assertRaises(TypeError, {}.__contains__, x=2)
def test_varargs1_kw(self):
self.assertRaises(TypeError, {}.__contains__, x=2)
@ -122,5 +120,61 @@ class CFunctionCalls(unittest.TestCase):
self.assertRaises(TypeError, [].count, x=2, y=2)
@cpython_only
class CFunctionCallsErrorMessages(unittest.TestCase):
def test_varargs0(self):
msg = r"__contains__\(\) takes exactly one argument \(0 given\)"
self.assertRaisesRegex(TypeError, msg, {}.__contains__)
def test_varargs2(self):
msg = r"__contains__\(\) takes exactly one argument \(2 given\)"
self.assertRaisesRegex(TypeError, msg, {}.__contains__, 0, 1)
def test_varargs1_kw(self):
msg = r"__contains__\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, {}.__contains__, x=2)
def test_varargs2_kw(self):
msg = r"__contains__\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, {}.__contains__, x=2, y=2)
def test_oldargs0_1(self):
msg = r"keys\(\) takes no arguments \(1 given\)"
self.assertRaisesRegex(TypeError, msg, {}.keys, 0)
def test_oldargs0_2(self):
msg = r"keys\(\) takes no arguments \(2 given\)"
self.assertRaisesRegex(TypeError, msg, {}.keys, 0, 1)
def test_oldargs0_1_kw(self):
msg = r"keys\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, {}.keys, x=2)
def test_oldargs0_2_kw(self):
msg = r"keys\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, {}.keys, x=2, y=2)
def test_oldargs1_0(self):
msg = r"count\(\) takes exactly one argument \(0 given\)"
self.assertRaisesRegex(TypeError, msg, [].count)
def test_oldargs1_2(self):
msg = r"count\(\) takes exactly one argument \(2 given\)"
self.assertRaisesRegex(TypeError, msg, [].count, 1, 2)
def test_oldargs1_0_kw(self):
msg = r"count\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, [].count, x=2)
def test_oldargs1_1_kw(self):
msg = r"count\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, [].count, {}, x=2)
def test_oldargs1_2_kw(self):
msg = r"count\(\) takes no keyword arguments"
self.assertRaisesRegex(TypeError, msg, [].count, x=2, y=2)
if __name__ == "__main__":
unittest.main()

2
Lib/test/test_itertools.py
View File

@ -1996,7 +1996,7 @@ class SubclassWithKwargsTest(unittest.TestCase):
Subclass(newarg=1)
except TypeError as err:
# we expect type errors because of wrong argument count
self.assertNotIn("does not take keyword arguments", err.args[0])
self.assertNotIn("keyword arguments", err.args[0])
@support.cpython_only
class SizeofTest(unittest.TestCase):

49
Objects/call.c
View File

@ -466,6 +466,10 @@ _PyMethodDef_RawFastCallDict(PyMethodDef *method, PyObject *self, PyObject **arg
switch (flags)
{
case METH_NOARGS:
if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
goto no_keyword_error;
}
if (nargs != 0) {
PyErr_Format(PyExc_TypeError,
"%.200s() takes no arguments (%zd given)",
@ -473,14 +477,14 @@ _PyMethodDef_RawFastCallDict(PyMethodDef *method, PyObject *self, PyObject **arg
goto exit;
}
if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
goto no_keyword_error;
}
result = (*meth) (self, NULL);
break;
case METH_O:
if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
goto no_keyword_error;
}
if (nargs != 1) {
PyErr_Format(PyExc_TypeError,
"%.200s() takes exactly one argument (%zd given)",
@ -488,16 +492,11 @@ _PyMethodDef_RawFastCallDict(PyMethodDef *method, PyObject *self, PyObject **arg
goto exit;
}
if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
goto no_keyword_error;
}
result = (*meth) (self, args[0]);
break;
case METH_VARARGS:
if (!(flags & METH_KEYWORDS)
&& kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
goto no_keyword_error;
}
/* fall through next case */
@ -592,7 +591,7 @@ _PyMethodDef_RawFastCallKeywords(PyMethodDef *method, PyObject *self, PyObject *
PyCFunction meth = method->ml_meth;
int flags = method->ml_flags & ~(METH_CLASS | METH_STATIC | METH_COEXIST);
Py_ssize_t nkwargs = kwnames == NULL ? 0 : PyTuple_Size(kwnames);
Py_ssize_t nkwargs = kwnames == NULL ? 0 : PyTuple_GET_SIZE(kwnames);
PyObject *result = NULL;
if (Py_EnterRecursiveCall(" while calling a Python object")) {
@ -602,6 +601,10 @@ _PyMethodDef_RawFastCallKeywords(PyMethodDef *method, PyObject *self, PyObject *
switch (flags)
{
case METH_NOARGS:
if (nkwargs) {
goto no_keyword_error;
}
if (nargs != 0) {
PyErr_Format(PyExc_TypeError,
"%.200s() takes no arguments (%zd given)",
@ -609,14 +612,14 @@ _PyMethodDef_RawFastCallKeywords(PyMethodDef *method, PyObject *self, PyObject *
goto exit;
}
if (nkwargs) {
goto no_keyword_error;
}
result = (*meth) (self, NULL);
break;
case METH_O:
if (nkwargs) {
goto no_keyword_error;
}
if (nargs != 1) {
PyErr_Format(PyExc_TypeError,
"%.200s() takes exactly one argument (%zd given)",
@ -624,10 +627,6 @@ _PyMethodDef_RawFastCallKeywords(PyMethodDef *method, PyObject *self, PyObject *
goto exit;
}
if (nkwargs) {
goto no_keyword_error;
}
result = (*meth) (self, args[0]);
break;
@ -637,16 +636,17 @@ _PyMethodDef_RawFastCallKeywords(PyMethodDef *method, PyObject *self, PyObject *
break;
case METH_VARARGS:
if (nkwargs) {
goto no_keyword_error;
}
/* fall through next case */
case METH_VARARGS | METH_KEYWORDS:
{
/* Slow-path: create a temporary tuple for positional arguments
and a temporary dict for keyword arguments */
PyObject *argtuple;
if (!(flags & METH_KEYWORDS) && nkwargs) {
goto no_keyword_error;
}
argtuple = _PyStack_AsTuple(args, nargs);
if (argtuple == NULL) {
goto exit;
@ -717,6 +717,7 @@ static PyObject *
cfunction_call_varargs(PyObject *func, PyObject *args, PyObject *kwargs)
{
assert(!PyErr_Occurred());
assert(kwargs == NULL || PyDict_Check(kwargs));
PyCFunction meth = PyCFunction_GET_FUNCTION(func);
PyObject *self = PyCFunction_GET_SELF(func);
@ -732,7 +733,7 @@ cfunction_call_varargs(PyObject *func, PyObject *args, PyObject *kwargs)
Py_LeaveRecursiveCall();
}
else {
if (kwargs != NULL && PyDict_Size(kwargs) != 0) {
if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
((PyCFunctionObject*)func)->m_ml->ml_name);
return NULL;

2
Objects/descrobject.c
View File

@ -1176,7 +1176,7 @@ wrapper_call(wrapperobject *wp, PyObject *args, PyObject *kwds)
if (kwds != NULL && (!PyDict_Check(kwds) || PyDict_GET_SIZE(kwds) != 0)) {
PyErr_Format(PyExc_TypeError,
"wrapper %s doesn't take keyword arguments",
"wrapper %s() takes no keyword arguments",
wp->descr->d_base->name);
return NULL;
}

48
Python/getargs.c
View File

@ -1704,13 +1704,21 @@ vgetargskeywords(PyObject *args, PyObject *kwargs, const char *format,
break;
}
if (max < nargs) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional arguments"
" (%d given)",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()",
(min != INT_MAX) ? "at most" : "exactly",
max, nargs);
if (max == 0) {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes no positional arguments",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()");
}
else {
PyErr_Format(PyExc_TypeError,
"%.200s%s takes %s %d positional arguments"
" (%d given)",
(fname == NULL) ? "function" : fname,
(fname == NULL) ? "" : "()",
(min != INT_MAX) ? "at most" : "exactly",
max, nargs);
}
return cleanreturn(0, &freelist);
}
}
@ -2079,12 +2087,20 @@ vgetargskeywordsfast_impl(PyObject **args, Py_ssize_t nargs,
return cleanreturn(0, &freelist);
}
if (parser->max < nargs) {
PyErr_Format(PyExc_TypeError,
"%200s%s takes %s %d positional arguments (%d given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
(parser->min != INT_MAX) ? "at most" : "exactly",
parser->max, nargs);
if (parser->max == 0) {
PyErr_Format(PyExc_TypeError,
"%200s%s takes no positional arguments",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()");
}
else {
PyErr_Format(PyExc_TypeError,
"%200s%s takes %s %d positional arguments (%d given)",
(parser->fname == NULL) ? "function" : parser->fname,
(parser->fname == NULL) ? "" : "()",
(parser->min != INT_MAX) ? "at most" : "exactly",
parser->max, nargs);
}
return cleanreturn(0, &freelist);
}
@ -2489,7 +2505,7 @@ _PyArg_NoKeywords(const char *funcname, PyObject *kwargs)
return 1;
}
PyErr_Format(PyExc_TypeError, "%.200s does not take keyword arguments",
PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
funcname);
return 0;
}
@ -2506,7 +2522,7 @@ _PyArg_NoStackKeywords(const char *funcname, PyObject *kwnames)
return 1;
}
PyErr_Format(PyExc_TypeError, "%.200s does not take keyword arguments",
PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
funcname);
return 0;
}
@ -2524,7 +2540,7 @@ _PyArg_NoPositional(const char *funcname, PyObject *args)
if (PyTuple_GET_SIZE(args) == 0)
return 1;
PyErr_Format(PyExc_TypeError, "%.200s does not take positional arguments",
PyErr_Format(PyExc_TypeError, "%.200s() takes no positional arguments",
funcname);
return 0;
}