最新问题 - 第174页

FENIX ф

Asked: 2024-11-27 01:35:14 +0000 UTC

无法使用MySql django正确迁移

5

当我尝试迁移时，我得到的是：

django.core.exceptions.ImproperlyConfigured:         
'django.db.backends.mysql' isn't an available database backend 
or couldn't be imported. Check the above exception. To use one 
of the built-in backends, use 'django.db.backends.XXX', where 
XXX is one of:
'oracle', 'postgresql', 'sqlite3'

看起来我做了一切：我提前创建了数据库，PyMySql在__init__.我正确配置了设置 - 还有什么原因？

user27630724

Asked: 2024-11-27 00:38:39 +0000 UTC

DP 任务。我不明白出了什么问题

6

通过问题E-蚱蜢和青蛙的解决方案满分：100 时间限制：2秒实时限制：5秒内存限制：256M 问题E：蚱蜢和青蛙问题条件（pdf）

蚱蜢沿着位于同一条线上且彼此距离相等的柱子跳跃。这些列的序列号为 1 到 N。一开始，蚱蜢坐在编号为 1 的柱子上。他可以向前跳跃 1 到 K 柱的距离，从当前的柱子开始计算。

有些帖子上有青蛙吃蚱蜢（蚱蜢不应该落在这些帖子上！）。确定 Grasshopper 可以通过多少种方式安全到达编号为 N 的列。请记住，Grasshopper 无法向后跳。输入格式输入字符串包含自然数 N 和 K，以空格分隔。保证1≤N，K≤32。第二行包含青蛙的数量 L (0≤L≤N−2)。第三行包含L个自然数：青蛙所坐的列数（其中没有数字为1和N的列）。

Примеры
Входные данные
6 4
2
2 4
Выходные данные
3

我不明白出了什么问题，并非所有测试都通过

n, k = map(int, input().split())
l = int(input())
s_l = list(map(int, input().split()))
dp = [1] * n
dp_1 = []
for i in range(l):
    dp[s_l[i] - 1] = 0
dp_1 = []
dp_1.append(dp[0])
print(dp)
for i in range(1,n):
    if dp[i] == 0:
        pass
    else:
        if i < k:
            dp_1.append(sum(dp_1[:i]))
        else:
            dp_1.append(sum(dp_1[i - k:i]))
print(dp_1[-1])

Таня Мамоля

Asked: 2024-11-26 23:26:13 +0000 UTC

是否可以在 asyncio 中进行两次超时等待？

5

我正在学习 asyncio 并需要解决以下问题。如果协程完成时间超过 3 秒，则需要完成任务。其余任务必须在10秒后完成（程序总运行时间为10秒）。像这样的代码。

async def some_coro(time):
    print(f"Корутина {asyncio.current_task().get_name()} запустилась")
    try:
       await asyncio.sleep(time)
       print(f"Корутина {asyncio.current_task().get_name()} завершилась")
    except asyncio.CancelledError:
       print(f"Корутина {asyncio.current_task().get_name()} отменена")
    

async def wait_10():
    print('начало отсчета 10 сек')
    await asyncio.sleep(10)
    print ('10 сек прошло. Завершаем все задачи')
    for task in asyncio.all_tasks():
        try:
            task.cancel()
        except asyncio.CancelledError:
            pass

async def main():
   tasks = [asyncio.create_task(some_coro(12)), asyncio.create_task(some_coro(2)), asyncio.create_task(some_coro(15))]
    #await asyncio.create_task(wait_10())
   await asyncio.wait(tasks, timeout=5)

asyncio.run(main())

如果我只运行一个 asyncio.wait(tasks, timeout=5)。然后简单地在 5 秒后取消未完成的任务（但没有 10 秒的通用计数器）如果我添加等待 asyncio.create_task(wait_10())，那么似乎 asyncio.wait 中的超时“不再起作用”，并且这对我来说就是全部任务在 10 秒后完成，而不是在 5 秒超时后完成。首先，我想亲自了解为什么会发生这种情况？其次，是否可以制作“两个独立”的计数器？我觉得我缺少一些异步基础知识，想弄清楚。提前致谢。

Kirill

Asked: 2024-11-26 19:36:01 +0000 UTC

输入一个 JTable 单元格的值后，该单元格的值会复制到所有单元格

5

我有一个程序，目前实现了添加和删除表格列的功能，但有一个问题：当您向该表格中输入值时，它们开始在其他单元格中重复：

我在一个单元格中输入一个值：

然后我按 Enter 键停止编辑单元格，不知何故，该单元格左侧的所有单元格都神奇地填充了相同的值：

如果我单击该单元格右侧的任何单元格，则原始单元格和单击单元格之间的所有单元格（包括它）都将填充相同的值：

如果我与按钮交互以沿着一行单元格移动，则所有单元格都会填充相同的值。

代码：

package ru.kirill.task9;


import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.DefaultCellEditor;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

import ru.kirill.addition.Addition;


public class GraphicApp {
    private boolean isReverse = false;

    class MainFrame extends JFrame {
        private static final String TITLE = "Главное меню";
        private static final String MINUS = "-";
        private static final String PLUS = "+";
        private static final String OPEN_BUTTON_TEXT = "Открыть";
        private static final String SAVE_BUTTON_TEXT = "Сохранить";
        private static final String REVERSE_BUTTON_TEXT = "Перевернуть";
        private static final String ENTER_LABEL_TITLE = "Количество элементов";
        private static final String CALCULATE_BUTTON_TEXT = "Рассчитать";
        private static final String REFRESH_BUTTON_TEXT = "Обновить";

        JButton minusButton;
        JButton refreshButton;
        JButton plusButton;
        JButton openButton;
        JButton saveButton;
        JButton reverseButton;
        JButton calculateButton;
        JTable inputTable;
        JTable outputTable;
        JLabel titleOfEnterQuantityElements;
        JTextField fieldOfEnterQuantityElements;


        MainFrame() {
            super(TITLE);
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            createMainFrameLayout();

            minusButton.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    int numberOfCells = Integer.parseInt(fieldOfEnterQuantityElements.getText());
                    if (numberOfCells > 1) {
                        fieldOfEnterQuantityElements.setText(
                            Integer.toString(
                                numberOfCells - 1));
                    }
                }
            });

            refreshButton.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    int numberOfCells = 1;
                    try {
                        numberOfCells = Integer.parseInt(fieldOfEnterQuantityElements.getText());
                    } catch (NumberFormatException err) {
                        JOptionPane.showMessageDialog(null,
                                                      "Вы ввели неверное значение");
                        fieldOfEnterQuantityElements.setText("1");
                    }
                    int columnCount = inputTable.getColumnCount();
                    if (numberOfCells < 1) {
                        numberOfCells = 1;
                        fieldOfEnterQuantityElements.setText("1");
                    }
                    if (numberOfCells < columnCount) {
                        TableColumnModel inputTableModel = inputTable.getColumnModel();
                        for (int i = 0; i < columnCount - numberOfCells; i++) {
                            inputTable.removeColumn(inputTableModel.getColumn(columnCount - i - 1));
                        }
                    } else {
                        for (int i = 0; i < numberOfCells - columnCount; i++) {
                            TableColumn newColumn = new TableColumn();
                            newColumn.setCellRenderer(new CustomCellRenderer());
                            newColumn.setCellEditor(new CustomCellEditor(new JTextField()));
                            inputTable.addColumn(newColumn);
                        }
                    }
                }
            });

            plusButton.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    fieldOfEnterQuantityElements.setText(
                        Integer.toString(
                            Integer.parseInt(fieldOfEnterQuantityElements.getText()) + 1));
                }
            });

            pack();
            setSize(600, 285);
            setLocationRelativeTo(null);
            setResizable(false);
            setVisible(true);

            calculateButton.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    for (int i = 0; i < inputTable.getColumnCount(); i++) {
                        System.out.print(inputTable.getValueAt(0, i));
                    }
                }
            });
        }


        private void createMainFrameLayout() {
            Container pane = getContentPane();
            pane.setLayout(new GridBagLayout());
            GridBagConstraints layout = new GridBagConstraints();

            JPanel topInteractionPanel = new JPanel(new GridBagLayout());
            topInteractionPanel.setBackground(Color.GREEN);
            layout.fill = GridBagConstraints.BOTH;
            layout.weightx = 1;
            layout.weighty = 0.15;
            layout.gridx = 0;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            pane.add(topInteractionPanel, layout);

            minusButton = new JButton(MINUS);
            layout.fill = GridBagConstraints.BOTH;
            layout.weightx = 0.1;
            layout.weighty = 1;
            layout.gridx = 0;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            topInteractionPanel.add(minusButton, layout);

            JPanel enterQuantityElementsPanel = new JPanel(new GridBagLayout());
            layout.weightx = 0.8;
            layout.weighty = 1;
            layout.gridx = 1;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            topInteractionPanel.add(enterQuantityElementsPanel, layout);

            titleOfEnterQuantityElements = new JLabel(ENTER_LABEL_TITLE);
            layout.weightx = 1;
            layout.weighty = 0.5;
            layout.gridx = 0;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            enterQuantityElementsPanel.add(titleOfEnterQuantityElements, layout);

            JPanel enterTextFieldPanel = new JPanel(new GridBagLayout());
            layout.weightx = 1;
            layout.weighty = 0.5;
            layout.gridx = 0;
            layout.gridy = 1;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            enterQuantityElementsPanel.add(enterTextFieldPanel, layout);

            fieldOfEnterQuantityElements = new JTextField();
            fieldOfEnterQuantityElements.setText("1");
            layout.weightx = 0.7;
            layout.weighty = 1;
            layout.gridx = 0;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            enterTextFieldPanel.add(fieldOfEnterQuantityElements, layout);

            refreshButton = new JButton(REFRESH_BUTTON_TEXT);
            layout.weightx = 0.3;
            layout.weighty = 1;
            layout.gridx = 1;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            enterTextFieldPanel.add(refreshButton, layout);

            plusButton = new JButton(PLUS);
            layout.weightx = 0.1;
            layout.weighty = 1;
            layout.gridx = 2;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            topInteractionPanel.add(plusButton, layout);


            JPanel inputTablePanel = new JPanel(new GridBagLayout());
            inputTablePanel.setBackground(Color.BLUE);
            layout.fill = GridBagConstraints.BOTH;
            layout.weightx = 1;
            layout.weighty = 0.30;
            layout.gridx = 0;
            layout.gridy = 1;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            pane.add(inputTablePanel, layout);

            inputTable = new JTable(1, 1);
            TableColumnModel inputTableModel = inputTable.getColumnModel();
            TableColumn firstColumn = new TableColumn();
            firstColumn.setCellRenderer(new CustomCellRenderer());
            firstColumn.setCellEditor(new CustomCellEditor(new JTextField()));
            inputTableModel.addColumn(firstColumn);
            inputTableModel.removeColumn(inputTable.getColumnModel().getColumn(0));
            inputTable.setTableHeader(null);
            inputTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
            inputTable.setRowHeight(50);
            JScrollPane inputScrollPane = new JScrollPane(inputTable);
            layout.fill = GridBagConstraints.BOTH;
            layout.weightx = 1;
            layout.weighty = 1;
            layout.gridx = 0;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            inputTablePanel.add(inputScrollPane, layout);


            JPanel bottomInteractionPanel = new JPanel(new GridBagLayout());
            bottomInteractionPanel.setBackground(Color.ORANGE);
            layout.fill = GridBagConstraints.BOTH;
            layout.weightx = 1;
            layout.weighty = 0.15;
            layout.gridx = 0;
            layout.gridy = 2;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            pane.add(bottomInteractionPanel, layout);

            openButton = new JButton(OPEN_BUTTON_TEXT);
            layout.weightx = 0.25;
            layout.weighty = 1;
            layout.gridx = 0;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            bottomInteractionPanel.add(openButton, layout);

            saveButton = new JButton(SAVE_BUTTON_TEXT);
            layout.weightx = 0.25;
            layout.weighty = 1;
            layout.gridx = 1;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            bottomInteractionPanel.add(saveButton, layout);

            reverseButton = new JButton(REVERSE_BUTTON_TEXT);
            layout.weightx = 0.25;
            layout.weighty = 1;
            layout.gridx = 2;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            bottomInteractionPanel.add(reverseButton, layout);

            calculateButton = new JButton(CALCULATE_BUTTON_TEXT);
            layout.weightx = 0.25;
            layout.weighty = 1;
            layout.gridx = 3;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            bottomInteractionPanel.add(calculateButton, layout);


            JPanel outputTablePanel = new JPanel(new GridBagLayout());
            outputTablePanel.setBackground(Color.RED);
            layout.fill = GridBagConstraints.BOTH;
            layout.weightx = 1;
            layout.weighty = 0.30;
            layout.gridx = 0;
            layout.gridy = 3;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            pane.add(outputTablePanel, layout);

            outputTable = new JTable(1, 1);
            outputTable.setTableHeader(null);
            outputTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
            outputTable.setRowHeight(50);
            outputTable.setEnabled(false);
            JScrollPane outputScrollPane = new JScrollPane(outputTable);
            layout.fill = GridBagConstraints.BOTH;
            layout.weightx = 1;
            layout.weighty = 1;
            layout.gridx = 0;
            layout.gridy = 0;
            layout.gridwidth = 1;
            layout.gridheight = 1;
            outputTablePanel.add(outputScrollPane, layout);
        }


        class CustomCellEditor extends DefaultCellEditor {
            public CustomCellEditor(JTextField textField) {
                super(textField);
                this.clickCountToStart = 1;
            }
        }


        class CustomCellRenderer extends DefaultTableCellRenderer {
            public Component getTableCellRendererComponent(JTable table, Object value,
                                                           boolean isSelected, boolean hasFocus,
                                                           int row, int column) {
                setFont(table.getFont());
                setValue(value);
                return this;
            }
        }
    }


    public GraphicApp() {
        new MainFrame();
    }
    public GraphicApp(boolean isReverse) {
        this.isReverse = isReverse;
        new MainFrame();
    }


    public static void main(String[] args) {
        new GraphicApp();
    }
}

如何删除此自动完成功能以使一切正常？

无法使用MySql django正确迁移

DP 任务。我不明白出了什么问题

如何将变量从一个类传递到另一个类？

是否可以在 asyncio 中进行两次超时等待？

输入一个 JTable 单元格的值后，该单元格的值会复制到所有单元格

我看不懂措辞

请求的模块“del”不提供名为“default”的导出

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