python - 为我的 PyQt 应用程序选择 IPython Qt 控制台

Question

我正在使用 Python 创建一个控制台驱动的 Qt 应用程序。我不想实现自己的自定义控制台，而是想嵌入 IPython Qt 控制台，同时使其响应我的应用程序。例如，我希望将某些关键字输入到控制台来触发我的主应用程序中的操作。因此，我在控制台中输入“dothis”，然后在应用程序的另一个窗口中显示了一个绘图。

我看到了一些类似的问题:this one讨论如何将 IPython Qt 小部件嵌入到您的应用程序中并传递函数，尽管看起来这些函数在 IPython 内核中执行，而不是在我的主应用程序的内核中执行。还有this guy ，但我无法执行示例中的代码(它已经有两年了)，而且它看起来也没有做我想要的事情。

有没有一种方法可以传递将在我的主内核中执行的函数或方法，或者至少通过与 IPython 内核通信以某种方式模拟这种行为？以前有人这样做过吗？

Answer 1

这是我想出来的，到目前为止效果很好。我对 RichIPythonWidget 类进行子类化并重载 _execute 方法。每当用户在控制台中输入内容时，我都会根据注册命令列表进行检查；如果它与命令匹配，那么我执行命令代码，否则我只是将输入传递给默认的 _execute 方法。

控制台代码:

from IPython.qt.console.rich_ipython_widget import RichIPythonWidget

class CommandConsole( RichIPythonWidget ):
    """
    This is a thin wrapper around IPython's RichIPythonWidget. It's
    main purpose is to register console commands and intercept
    them when typed into the console.

    """
    def __init__(self, *args, **kw ):
         kw['kind'] = 'cc'
         super(CommandConsole, self).__init__(*args, **kw)
         self.commands = {}


    def _execute(self, source, hidden):
        """
        Overloaded version of the _execute first checks the console
        input against registered commands. If it finds a command it
        executes it, otherwise it passes the input to the back kernel
        for processing.

        """
        try:
            possible_cmd = source.split()[0].strip()
        except:
            return super(CommandConsole, self)._execute("pass", hidden)

        if possible_cmd in self.commands.keys():
            # Commands return code that is passed to the console for execution.
            s = self.commands[possible_cmd].execute()
            return super(CommandConsole, self)._execute( s, hidden )
        else:
            # Default back to the original _execute
            return super(CommandConsole, self)._execute(source, hidden)


    def register_command( self, name, command ):
        """
        This method links the name of a command (name) to the function
        that should be called when it is typed into the console (command).

        """
        self.commands[name] = command

示例命令:

from PyQt5.QtCore import pyqtSignal, QObject, QFile

class SelectCommand( QObject ):
    """
    The Select command class.

    """
    # This signal is emitted whenever the command is executed.
    executed = pyqtSignal( str, dict, name = "selectExecuted" )

    # This is the command as typed into the console.
    name = "select"

    def execute(self):
        """
        This method is executed whenever the ``name`` command is issued
        in the console.

        """
        name = "data description"
        data = { "data dict" : 0 }
        # The signal is sent to my Qt Models
        self.executed.emit( name, data )
        # This code is executed in the console.
        return 'print("the select command has been executed")'