AttributeError: 'generator' object has no attribute 'append'

Question

我曾经运行将这段代码作为单元测试，但突然它不起作用了

代码：

    import requests
    import pytest
  
    class TestSample:
        url = 'https://something/apiname'
        @pytest.fixture()
        def post_request(self, data):
            url = self.url + '/1'
            res = requests.post(url, headers={"Content-Type": "application/json"},json=data)
            yield res
    
        @pytest.mark.parametrize("data,result",
                    [( {"ids": ["524234", "12341", "97555"]},200))]
        def test_post_sample_data(self, data, result, post_request):
             rs = post_request
             assert rs.status_code == result

错误：

platform win32 -- Python 3.6.4, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
plugins: hypothesis-5.37.4, cases-2.3.0
test_selectsample.py:None (test_selectsample.py)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pluggy\hooks.py:286: in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pluggy\manager.py:93: in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pluggy\manager.py:87: in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\_pytest\python.py:249: in pytest_pycollect_makeitem
    initialnames, node, ignore_args=self._get_direct_parametrize_args(node)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pytest_cases\plugin.py:614: in getfixtureclosure
    _init_fixnames, super_closure, arg2fixturedefs = create_super_closure(fm, parentnode, fixturenames, ignore_args)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pytest_cases\plugin.py:668: in create_super_closure
    _merge(sorted_fixturenames, _init_fixnames)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pytest_cases\plugin.py:655: in _merge
    into_list.append(item)
E   AttributeError: 'generator' object has no attribute 'append'
collected 0 items / 1 error

===================================错误========= ===========================

_____________________ ERROR collecting test_selectids.py ______________________
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pluggy\hooks.py:286: in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pluggy\manager.py:93: in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
    res = list(collector._genfunctions(name, obj))
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\_pytest\python.py:458: in _genfunctions
    initialnames, node, ignore_args=self._get_direct_parametrize_args(node)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pytest_cases\plugin.py:614: in getfixtureclosure
    _init_fixnames, super_closure, arg2fixturedefs = create_super_closure(fm, parentnode, fixturenames, ignore_args)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pytest_cases\plugin.py:668: in create_super_closure
    _merge(sorted_fixturenames, _init_fixnames)
..\..\AppData\Local\Programs\Python\Python36\lib\site-packages\pytest_cases\plugin.py:655: in _merge
    into_list.append(item)
E   AttributeError: 'generator' object has no attribute 'append'
=========================== short test summary info ===========================
ERROR test_selectsample.py::TestSample - AttributeError: 'generator' object ha...
!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
============================== 1 error in 0.35s ===============================
Process finished with exit code 0
Assertion failed
Assertion failed

知道是什么原因造成的吗？我该如何预防？提前致谢

Answer 1

pytest.mark.parametrize 的第二个参数需要是一个元组列表。在你的例子中是这样的：

@pytest.mark.parametrize("data,result", [
    ({"ids": ["524234", "12341", "97555"]}, 200),
])
def test_post_sample_data(self, data, result, post_request):
    rs = post_request
    assert rs.status_code == result

编辑：

尝试将 post_request 上方的 @pytest.fixture() 替换为 @pytest.fixture
fixture 有 data 参数，它看起来没有在任何地方填充

Answer 2

此问题已通过更改解释器版本得到解决。我将 python3.6 更改为 3.8，问题解决了！希望这个post对某人有用

AttributeError: 'generator' object has no attribute 'append'

AttributeError: 'generator' object has no attribute 'append'

python

pytest

python-unittest

attributeerror