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bpo-35634: Raise an error when first passed kwargs contains duplicated keys. (GH-11438)

This commit is contained in:
Serhiy Storchaka 2019-01-12 10:12:24 +02:00 committed by GitHub
parent 58159ef856
commit f1ec3cefad
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 94 additions and 48 deletions
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46
Lib/test/test_extcall.py
View File

@ -316,6 +316,52 @@ not function
...
TypeError: dir() got multiple values for keyword argument 'b'
Test a kwargs mapping with duplicated keys.
>>> from collections.abc import Mapping
>>> class MultiDict(Mapping):
... def __init__(self, items):
... self._items = items
...
... def __iter__(self):
... return (k for k, v in self._items)
...
... def __getitem__(self, key):
... for k, v in self._items:
... if k == key:
... return v
... raise KeyError(key)
...
... def __len__(self):
... return len(self._items)
...
... def keys(self):
... return [k for k, v in self._items]
...
... def values(self):
... return [v for k, v in self._items]
...
... def items(self):
... return [(k, v) for k, v in self._items]
...
>>> g(**MultiDict([('x', 1), ('y', 2)]))
1 () {'y': 2}
>>> g(**MultiDict([('x', 1), ('x', 2)]))
Traceback (most recent call last):
...
TypeError: g() got multiple values for keyword argument 'x'
>>> g(a=3, **MultiDict([('x', 1), ('x', 2)]))
Traceback (most recent call last):
...
TypeError: g() got multiple values for keyword argument 'x'
>>> g(**MultiDict([('a', 3)]), **MultiDict([('x', 1), ('x', 2)]))
Traceback (most recent call last):
...
TypeError: g() got multiple values for keyword argument 'x'
Another helper function
>>> def f2(*a, **b):

3
Misc/NEWS.d/next/Core and Builtins/2019-01-05-18-39-49.bpo-35634.nVP_gs.rst Normal file
View File

@ -0,0 +1,3 @@
``func(**kwargs)`` will now raise an error when ``kwargs`` is a mapping
containing multiple entries with the same key. An error was already raised
when other keyword arguments are passed before ``**kwargs`` since Python 3.6.

93
Python/ceval.c
View File

@ -70,7 +70,7 @@ static PyObject * unicode_concatenate(PyObject *, PyObject *,
PyFrameObject *, const _Py_CODEUNIT *);
static PyObject * special_lookup(PyObject *, _Py_Identifier *);
static int check_args_iterable(PyObject *func, PyObject *vararg);
static void format_kwargs_mapping_error(PyObject *func, PyObject *kwargs);
static void format_kwargs_error(PyObject *func, PyObject *kwargs);
static void format_awaitable_error(PyTypeObject *, int);
#define NAME_ERROR_MSG \
@ -2660,37 +2660,8 @@ main_loop:
for (i = oparg; i > 0; i--) {
PyObject *arg = PEEK(i);
if (_PyDict_MergeEx(sum, arg, 2) < 0) {
PyObject *func = PEEK(2 + oparg);
if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
format_kwargs_mapping_error(func, arg);
}
else if (PyErr_ExceptionMatches(PyExc_KeyError)) {
PyObject *exc, *val, *tb;
PyErr_Fetch(&exc, &val, &tb);
if (val && PyTuple_Check(val) && PyTuple_GET_SIZE(val) == 1) {
PyObject *key = PyTuple_GET_ITEM(val, 0);
if (!PyUnicode_Check(key)) {
PyErr_Format(PyExc_TypeError,
"%.200s%.200s keywords must be strings",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func));
} else {
PyErr_Format(PyExc_TypeError,
"%.200s%.200s got multiple "
"values for keyword argument '%U'",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func),
key);
}
Py_XDECREF(exc);
Py_XDECREF(val);
Py_XDECREF(tb);
}
else {
PyErr_Restore(exc, val, tb);
}
}
Py_DECREF(sum);
format_kwargs_error(PEEK(2 + oparg), arg);
goto error;
}
}
@ -3286,17 +3257,9 @@ main_loop:
PyObject *d = PyDict_New();
if (d == NULL)
goto error;
if (PyDict_Update(d, kwargs) != 0) {
if (_PyDict_MergeEx(d, kwargs, 2) < 0) {
Py_DECREF(d);
/* PyDict_Update raises attribute
* error (percolated from an attempt
* to get 'keys' attribute) instead of
* a type error if its second argument
* is not a mapping.
*/
if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
format_kwargs_mapping_error(SECOND(), kwargs);
}
format_kwargs_error(SECOND(), kwargs);
Py_DECREF(kwargs);
goto error;
}
@ -5063,14 +5026,48 @@ check_args_iterable(PyObject *func, PyObject *args)
}
static void
format_kwargs_mapping_error(PyObject *func, PyObject *kwargs)
format_kwargs_error(PyObject *func, PyObject *kwargs)
{
PyErr_Format(PyExc_TypeError,
"%.200s%.200s argument after ** "
"must be a mapping, not %.200s",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func),
kwargs->ob_type->tp_name);
/* _PyDict_MergeEx raises attribute
* error (percolated from an attempt
* to get 'keys' attribute) instead of
* a type error if its second argument
* is not a mapping.
*/
if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Format(PyExc_TypeError,
"%.200s%.200s argument after ** "
"must be a mapping, not %.200s",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func),
kwargs->ob_type->tp_name);
}
else if (PyErr_ExceptionMatches(PyExc_KeyError)) {
PyObject *exc, *val, *tb;
PyErr_Fetch(&exc, &val, &tb);
if (val && PyTuple_Check(val) && PyTuple_GET_SIZE(val) == 1) {
PyObject *key = PyTuple_GET_ITEM(val, 0);
if (!PyUnicode_Check(key)) {
PyErr_Format(PyExc_TypeError,
"%.200s%.200s keywords must be strings",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func));
} else {
PyErr_Format(PyExc_TypeError,
"%.200s%.200s got multiple "
"values for keyword argument '%U'",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func),
key);
}
Py_XDECREF(exc);
Py_XDECREF(val);
Py_XDECREF(tb);
}
else {
PyErr_Restore(exc, val, tb);
}
}
}
static void