Question

我试图从Python异步返回XHR网址列表。下面是我的代码。

from PyQt5.QtWidgets import QApplication, QMainWindow, QGridLayout, QWidget, QTableWidget, QTableWidgetItem
from PyQt5.QtCore import QSize, Qt


class MainWindow(QMainWindow):
    # Override class constructor
    def __init__(self):
        # You must call the super class method
        QMainWindow.__init__(self)

        self.setMinimumSize(QSize(480, 80))         # Set sizes 
        self.setWindowTitle("Работа с QTableWidget")    # Set the window title
        central_widget = QWidget(self)              # Create a central widget
        self.setCentralWidget(central_widget)       # Install the central widget

        grid_layout = QGridLayout(self)         # Create QGridLayout
        central_widget.setLayout(grid_layout)   # Set this layout in central widget

        table = QTableWidget(self)  # Create a table
        table.setColumnCount(3)     #Set three columns
        table.setRowCount(1)        # and one row

        # Set the table headers
        table.setHorizontalHeaderLabels(["Header 1", "Header 2", "Header 3"])

        #Set the tooltips to headings
        table.horizontalHeaderItem(0).setToolTip("Column 1 ")
        table.horizontalHeaderItem(1).setToolTip("Column 2 ")
        table.horizontalHeaderItem(2).setToolTip("Column 3 ")

        # Set the alignment to the headers
        table.horizontalHeaderItem(0).setTextAlignment(Qt.AlignLeft)
        table.horizontalHeaderItem(1).setTextAlignment(Qt.AlignHCenter)
        table.horizontalHeaderItem(2).setTextAlignment(Qt.AlignRight)

        # Fill the first line
        table.setItem(0, 0, QTableWidgetItem("Text in column 1"))
        table.setItem(0, 1, QTableWidgetItem("Text in column 2"))
        table.setItem(0, 2, QTableWidgetItem("Text in column 3"))

        # Do the resize of the columns by content
        table.resizeColumnsToContents()

        grid_layout.addWidget(table, 0, 0)   # Adding the table to the grid


if __name__ == "__main__":
    import sys

    app = QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    sys.exit(app.exec())

但是，当我运行代码时，res.request.url被打印出来，但是没有返回xhr_list，导致url为None。我的代码有问题吗？

Answer 1

您的代码有两个问题。首先，intercept_response试图构造一个列表，但是该列表始终是新创建的，并且最多只能包含一个元素。由于intercept_response被多次调用，因此应将其附加到相同的列表中。

此外，您需要确保intercept_response的返回值传播到main，并从那里实际返回。例如，您可以使用闭包（内部def）分配给外部作用域中定义的变量：

async def main():
    browser = await launch(headless=False)
    page = await browser.newPage()
    url = []
    async def intercept_response(res):
        if res.request.resourceType == 'xhr':
            print(res.request.url)
            url.append(res.request.url)
    page.on('response', intercept_response)
    await page.setUserAgent('Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1')
    await page.goto('https://www.iesdouyin.com/share/user/70015326114', waitUntil = 'networkidle2')
    await browser.close()
    return url

Python异步def如何返回值

1 个答案: