def get_value(self, name):
        """Ask kernel for a value"""
        code = u"get_ipython().kernel.get_value('%s')" % name
        if self._reading:
            method = self.kernel_client.input
            code = u'!' + code
        else:
            method = self.silent_execute

        # Wait until the kernel returns the value
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        method(code)
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        # Handle exceptions
        if self._kernel_value is None:
            if self._kernel_reply:
                msg = self._kernel_reply[:]
                self._kernel_reply = None
                raise ValueError(msg)

        return self._kernel_value

    def silent_exec_input(self, code):
        """Silently execute code through stdin"""
        self._hidden = True

        # Wait until the kernel returns an answer
        wait_loop = QEventLoop()
        self.sig_input_reply.connect(wait_loop.quit)
        self.kernel_client.iopub_channel.flush()
        self.kernel_client.input(code)
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_input_reply.disconnect(wait_loop.quit)
        wait_loop = None

        # Restore hidden state
        self._hidden = False

        # Emit signal
        if 'pdb_step' in code and self._input_reply is not None:
            fname = self._input_reply['fname']
            lineno = self._input_reply['lineno']
            self.sig_pdb_step.emit(fname, lineno)
        elif 'get_namespace_view' in code:
            view = self._input_reply
            self.sig_namespace_view.emit(view)
        elif 'get_var_properties' in code:
            properties = self._input_reply
            self.sig_var_properties.emit(properties)

    def get_value(self, name):
        """Ask kernel for a value"""
        # Don't ask for values while reading (ipdb) is active
        if self._reading:
            raise ValueError(_("Inspecting and setting values while debugging "
                               "in IPython consoles is not supported yet by "
                               "Spyder."))

        # Wait until the kernel returns the value
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        self.silent_execute("get_ipython().kernel.get_value('%s')" % name)
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        # Handle exceptions
        if self._kernel_value is None:
            if self._kernel_reply:
                msg = self._kernel_reply[:]
                self._kernel_reply = None
                raise ValueError(msg)

        return self._kernel_value

    def get_source(self, objtxt):
        """Get object source"""
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        self.silent_exec_method("get_ipython().kernel.get_source('%s')" % objtxt)
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        return self._kernel_reply

    def write_to_stdin(self, line):
        """Send raw characters to the IPython kernel through stdin"""
        wait_loop = QEventLoop()
        self.sig_prompt_ready.connect(wait_loop.quit)
        self.kernel_client.input(line)
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_prompt_ready.disconnect(wait_loop.quit)
        wait_loop = None

        # Run post exec commands
        self._post_exec_input(line)

    def save_namespace(self, filename):
        # Wait until the kernel tries to save the file
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        self.silent_exec_method("get_ipython().kernel.save_namespace('%s')" %
                                filename)
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        return self._kernel_reply

    def load_data(self, filename, ext):
        # Wait until the kernel tries to load the file
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        self.silent_exec_method(
                "get_ipython().kernel.load_data('%s', '%s')" % (filename, ext))
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        return self._kernel_reply

    def get_doc(self, objtxt):
        """Get object documentation dictionary"""
        if self._reading:
            return
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        self.silent_exec_method("get_ipython().kernel.get_doc('%s')" % objtxt)
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        return self._kernel_reply

    def is_defined(self, objtxt, force_import=False):
        """Return True if object is defined"""
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        self.silent_exec_method(
            "get_ipython().kernel.is_defined('%s', force_import=%s)"
            % (objtxt, force_import))
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        return self._kernel_reply

 def onHelp(self):
     """
     Shows the help page
     """
     try:
         from pymantidplot.proxies import showCustomInterfaceHelp
         showCustomInterfaceHelp("PyChop")
     except ImportError:
         helpTxt = "PyChop is a tool to allow direct inelastic neutron\nscattering users to estimate the inelastic resolution\n"
         helpTxt += "and incident flux for a given spectrometer setting.\n\nFirst select the instrument, chopper settings and\n"
         helpTxt += "Ei, and then click 'Calculate and Plot'. Data for all\nthe graphs will be generated (may take 1-2s) and\n"
         helpTxt += "all graphs will be updated. If the 'Hold current plot'\ncheck box is ticked, additional settings will be\n"
         helpTxt += "overplotted on the existing graphs if they are\ndifferent from previous settings.\n\nMore in-depth help "
         helpTxt += "can be obtained from the\nMantid help pages."
         self.hlpwin = QDialog()
         self.hlpedt = QLabel(helpTxt)
         self.hlpbtn = QPushButton('OK')
         self.hlpwin.layout = QVBoxLayout(self.hlpwin)
         self.hlpwin.layout.addWidget(self.hlpedt)
         self.hlpwin.layout.addWidget(self.hlpbtn)
         self.hlpbtn.clicked.connect(self.hlpwin.deleteLater)
         self.hlpwin.setWindowTitle('Help')
         self.hlpwin.setWindowModality(Qt.ApplicationModal)
         self.hlpwin.setAttribute(Qt.WA_DeleteOnClose)
         self.hlpwin.setMinimumSize(370, 300)
         self.hlpwin.resize(370, 300)
         self.hlpwin.show()
         self.hlploop = QEventLoop()
         self.hlploop.exec_()

 def showText(self):
     """
     Creates a dialog to show the generated text output.
     """
     try:
         generatedText = self.genText()
     except ValueError:
         return
     self.txtwin = QDialog()
     self.txtedt = QTextEdit()
     self.txtbtn = QPushButton('OK')
     self.txtwin.layout = QVBoxLayout(self.txtwin)
     self.txtwin.layout.addWidget(self.txtedt)
     self.txtwin.layout.addWidget(self.txtbtn)
     self.txtbtn.clicked.connect(self.txtwin.deleteLater)
     self.txtedt.setText(generatedText)
     self.txtedt.setReadOnly(True)
     self.txtwin.setWindowTitle('Resolution information')
     self.txtwin.setWindowModality(Qt.ApplicationModal)
     self.txtwin.setAttribute(Qt.WA_DeleteOnClose)
     self.txtwin.setMinimumSize(400, 600)
     self.txtwin.resize(400, 600)
     self.txtwin.show()
     self.txtloop = QEventLoop()
     self.txtloop.exec_()

    def save_namespace(self, filename):
        if self._reading:
            message = _("Saving data while debugging is not supported.")
            QMessageBox.warning(self, _("Warning"), message)
            return
        # Wait until the kernel tries to save the file
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        self.silent_exec_method(r"get_ipython().kernel.save_namespace('%s')" %
                                filename)
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        return self._kernel_reply

 def wait_input(self, prompt=''):
     """Wait for input (raw_input support)"""
     self.new_prompt(prompt)
     self.setFocus()
     self.input_mode = True
     self.input_loop = QEventLoop()
     self.input_loop.exec_()
     self.input_loop = None

    def load_data(self, filename, ext):
        if self._reading:
            message = _("Loading this kind of data while debugging is not "
                        "supported.")
            QMessageBox.warning(self, _("Warning"), message)
            return
        # Wait until the kernel tries to load the file
        wait_loop = QEventLoop()
        self.sig_got_reply.connect(wait_loop.quit)
        self.silent_exec_method(
                r"get_ipython().kernel.load_data('%s', '%s')" % (filename, ext))
        wait_loop.exec_()

        # Remove loop connection and loop
        self.sig_got_reply.disconnect(wait_loop.quit)
        wait_loop = None

        return self._kernel_reply

#.........这里部分代码省略.........
        """Exit interpreter"""
        self.interpreter.exit_flag = True
        if self.multithreaded:
            self.interpreter.stdin_write.write(to_binary_string('\n'))
        self.interpreter.restore_stds()
        
    def edit_script(self, filename, external_editor):
        filename = to_text_string(filename)
        if external_editor:
            self.external_editor(filename)
        else:
            self.parent().edit_script(filename)            
                                    
    def stdout_avail(self):
        """Data is available in stdout, let's empty the queue and write it!"""
        data = self.interpreter.stdout_write.empty_queue()
        if data:
            self.write(data)
        
    def stderr_avail(self):
        """Data is available in stderr, let's empty the queue and write it!"""
        data = self.interpreter.stderr_write.empty_queue()
        if data:
            self.write(data, error=True)
            self.flush(error=True)
    
    
    #------Raw input support
    def wait_input(self, prompt=''):
        """Wait for input (raw_input support)"""
        self.new_prompt(prompt)
        self.setFocus()
        self.input_mode = True
        self.input_loop = QEventLoop()
        self.input_loop.exec_()
        self.input_loop = None
    
    def end_input(self, cmd):
        """End of wait_input mode"""
        self.input_mode = False
        self.input_loop.exit()
        self.interpreter.widget_proxy.end_input(cmd)


    #----- Menus, actions, ...
    def setup_context_menu(self):
        """Reimplement PythonShellWidget method"""
        PythonShellWidget.setup_context_menu(self)
        self.help_action = create_action(self, _("Help..."),
                           icon=ima.icon('DialogHelpButton'),
                           triggered=self.help)
        self.menu.addAction(self.help_action)

    @Slot()
    def help(self):
        """Help on Spyder console"""
        QMessageBox.about(self, _("Help"),
                          """<b>%s</b>
                          <p><i>%s</i><br>    edit foobar.py
                          <p><i>%s</i><br>    xedit foobar.py
                          <p><i>%s</i><br>    run foobar.py
                          <p><i>%s</i><br>    clear x, y
                          <p><i>%s</i><br>    !ls
                          <p><i>%s</i><br>    object?
                          <p><i>%s</i><br>    result = oedit(object)
                          """ % (_('Shell special commands:'),

#.........这里部分代码省略.........
            freq_names = obj.chopper_system.frequency_names
            for idx in range(len(freq_names)):
                txt += '#     %s at %3i Hz\n' % (freq_names[idx], freqs[idx])
        txt += self._gen_text_ei(ei_in, obj)
        if multiplot:
            for ei in sorted(self.engine.getAllowedEi()):
                if np.abs(ei - ei_in) > 0.001:
                    txt += self._gen_text_ei(ei, obj)
        return txt

    def showText(self):
        """
        Creates a dialog to show the generated text output.
        """
        try:
            generatedText = self.genText()
        except ValueError:
            return
        self.txtwin = QDialog()
        self.txtedt = QTextEdit()
        self.txtbtn = QPushButton('OK')
        self.txtwin.layout = QVBoxLayout(self.txtwin)
        self.txtwin.layout.addWidget(self.txtedt)
        self.txtwin.layout.addWidget(self.txtbtn)
        self.txtbtn.clicked.connect(self.txtwin.deleteLater)
        self.txtedt.setText(generatedText)
        self.txtedt.setReadOnly(True)
        self.txtwin.setWindowTitle('Resolution information')
        self.txtwin.setWindowModality(Qt.ApplicationModal)
        self.txtwin.setAttribute(Qt.WA_DeleteOnClose)
        self.txtwin.setMinimumSize(400, 600)
        self.txtwin.resize(400, 600)
        self.txtwin.show()
        self.txtloop = QEventLoop()
        self.txtloop.exec_()

    def saveText(self):
        """
        Saves the generated text to a file (opens file dialog).
        """
        fname = QFileDialog.getSaveFileName(self, 'Open file', '')
        if isinstance(fname, tuple):
            fname = fname[0]
        fid = open(fname, 'w')
        fid.write(self.genText())
        fid.close()

    def update_script(self):
        """
        Updates the text window with information about the previous calculation.
        """
        if self.widgets['MultiRepCheck'].isChecked():
            out = self.engine.getMultiWidths()
            new_str = '\n'
            for ie, ee in enumerate(out['Eis']):
                res = out['Energy'][ie]
                percent = res / ee * 100
                chop_width = out['chopper'][ie]
                mod_width = out['moderator'][ie]
                new_str += 'Ei is %6.2f meV, resolution is %6.2f ueV, percentage resolution is %6.3f\n' % (ee, res * 1000, percent)
                new_str += 'FWHM at sample from chopper and moderator are %6.2f us, %6.2f us\n' % (chop_width, mod_width)
        else:
            ei =  self.engine.getEi()
            out = self.engine.getWidths()
            res = out['Energy']
            percent = res / ei * 100