小编jie*_*jie的帖子

我很困惑如何使用setData、setItemData和setItem方法QStandardItemModel，这些方法似乎具有相同的效果，我想知道我应该选择使用哪种方法最好？

class DemoD(QMainWindow):
    def __init__(self):
        super().__init__()
        self.init_ui()

    def init_ui(self):
        table = QTableView()
        model = QStandardItemModel(4, 2)

        table.setModel(model)

        # delegate = SpinBoxDelegate()

        # table.setItemDelegate(delegate)

        for row in range(4):
            for col in range(2):
                item = QStandardItem('china')
                model.setItem(row, col, item)

                index = model.index(row, col)
                value = QVariant((row + 1)*(col + 1))
                model.setData(index, value)

                model.setItemData(index, {1: 'a', 2: 'b'})

        self.setCentralWidget(table)

        self.resize(400, 300)

app = QApplication([])
demo = DemoD()
demo.show()
app.exec()

在下面的示例代码中，当灯具处于模式时，如何在函数A()中获取对象？test_oneautouse

import pytest
import time

class A:
    def __init__(self):
        self.abc = 12
        

@pytest.fixture(autouse=True)
def test_foo():
    print('connecting')
    yield A()
    print('disconnect')
    
    
def test_one():
    #how can i get A() object?
    print([locals()])
    assert 1 == 1

我尝试在我的Mac上通过pip或brew安装PyQt，但全部失败并出现sipbuild.pyproject.PyProjectOptionException错误。需要帮助有人可以解决这个问题吗？

jett@jmac ~ % pip install pyqt5
Defaulting to user installation because normal site-packages is not writeable
Collecting pyqt5
  Using cached PyQt5-5.15.4.tar.gz (3.3 MB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... error
    ERROR: Command errored out with exit status 1:
     command: /Applications/Xcode.app/Contents/Developer/usr/bin/python3 /Library/Python/3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py prepare_metadata_for_build_wheel /var/folders/kk/ck6hb36n5z1373zlhm46l3m80000gn/T/tmpgdmdc09l
         cwd: /private/var/folders/kk/ck6hb36n5z1373zlhm46l3m80000gn/T/pip-install-bv0c7yxz/pyqt5_7923519b6ae5437192ce4b58d6719383
    Complete output (31 lines):
    Traceback (most recent call last):
      File "/Library/Python/3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 126, in prepare_metadata_for_build_wheel
        hook = backend.prepare_metadata_for_build_wheel
    AttributeError: module 'sipbuild.api' has …

在 python 中，我有一个对象data，它可能是任何对象。
在 vscodev1, v2 = data # type: str, str语句中我想要v1, v2 弹出 str 方法。
在vscodev1, v2 = data # type: dict, set句子中我想要v1, v2 弹出字典，设置方法。

data = (object, object)

v1, v2 = data # type: str, str

v11, v22= data # type: dict, set

但它在 pylance 中显示错误

Type annotation not supported for this type of expression
Unexpected token at end of expression

下面显示的代码，我创建了一个结构类型并希望将其编码为二进制。但它显示binary.Write: invalid type main.Stu错误，我读过一些类似的代码，但我找不到为什么我的代码不起作用？

type Stu struct {
    Name string
    Age int
    Id int
}

func main()  {
    s := &Stu{
        Name: "Leo",
        Age: 21,
        Id: 1,
    }

    buf := new(bytes.Buffer)
    err := binary.Write(buf, binary.BigEndian, s)
    if err != nil{
        fmt.Println(err)
    }
    fmt.Printf("%q\n", buf)
}