Question

我正在使用Python创建一个控制台驱动的Qt应用程序。我想嵌入IPython Qt控制台，而不是实现我自己的自定义控制台，但也让它响应我的应用程序。例如，我希望某些关键字输入到控制台以触发我的主应用程序中的操作。所以我在控制台中输入“dothis”，在我的应用程序的另一个窗口中显示一个图表。

我在这些方面看到了一些问题：this one讨论了如何将IPython Qt小部件嵌入到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内核中执行我的主应用程序。还有this guy，但是我不能在示例中执行代码（它已经两年了），看起来它看起来不像我想做的那样。

有没有办法可以传入将在我的主内核中执行的函数或方法，或者至少通过与IPython内核通信来模拟这种行为？有人曾经这样做过吗？

Answer 1

这就是我想出来的，到目前为止它运作良好。我继承RichIPythonWidget类并重载_execute方法。每当用户在控制台中键入内容时，我会根据已注册的命令列表进行检查;如果它匹配一个命令，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")'

为我的PyQt应用程序采用IPython Qt控制台

1 个答案: