2.6 一次性清除所有参数

https://forum.freecad.org/viewtopic.php?p=670676
一次性清除所有参数，有点保护知识产权的意思。使用前必须备份。

import FreeCAD as App
from PySide import QtCore, QtGui
from PySide.QtGui import QLineEdit, QRadioButton
ExpObjects = []

class ExpressionRemover():
    def __init__(self):

        for i in App.ActiveDocument.Objects:
            if i.isDerivedFrom("Part::Feature"):
                if len(i.ExpressionEngine) != 0:
                    ExpObjects.append(i.Name)
        if len(ExpObjects) == 0:
            App.Console.PrintWarning('There are no Expressions to be removed\n')
        else:
            self.dialog = None
            self.s1 = None

            # Make dialog box
            self.dialog = QtGui.QDialog()
            self.dialog.resize(300,120)
            self.dialog.setWindowTitle("Expression Remover")
            la = QtGui.QVBoxLayout(self.dialog)
            t1 = QtGui.QLabel("Choose to remove All expressions or specific objects in the combobox")
            la.addWidget(t1)

            # Add radio buttons
            self.radio1 = QtGui.QRadioButton("All Object Expressions")
            self.radio2 = QtGui.QRadioButton("Specific Objects")
            self.radio1.clicked.connect(self.on_radio1_clicked)
            self.radio2.clicked.connect(self.on_radio2_clicked)
            # self.radio2.setChecked(True)
            la.addWidget(self.radio1)
            la.addWidget(self.radio2)

            self.expObjs = QtGui.QComboBox()
            self.expObjs.addItems(ExpObjects)

            self.expObjs.setObjectName("expObjs")
            self.expObjs.currentIndexChanged.connect(self.check_validity)

            la.addWidget(self.expObjs)

            # Add OK / Cancel buttons
            self.okbox = QtGui.QDialogButtonBox(QtGui.QDialogButtonBox.Ok | QtGui.QDialogButtonBox.Cancel)
            la.addWidget(self.okbox)
            QtCore.QObject.connect(self.okbox, QtCore.SIGNAL("accepted()"), self.proceed)
            QtCore.QObject.connect(self.okbox, QtCore.SIGNAL("rejected()"), self.close)
            button = self.okbox.button(QtGui.QDialogButtonBox.Ok)
            button.setEnabled(False)
            QtCore.QMetaObject.connectSlotsByName(self.dialog)
            self.dialog.show()
            self.dialog.exec_()

    def check_validity(self,idx):
        App.Console.PrintLog("Current index %d selection changed %s\r\n" % (idx,self.expObjs.currentText()))        
        self.radio2.setChecked(True)
        button = self.okbox.button(QtGui.QDialogButtonBox.Ok)
        button.setEnabled(True)

    def on_radio1_clicked(self):
        button = self.okbox.button(QtGui.QDialogButtonBox.Ok)
        button.setEnabled(True)

    def on_radio2_clicked(self):
        button = self.okbox.button(QtGui.QDialogButtonBox.Ok)
        button.setEnabled(True)

    def proceed(self):
        if self.radio1.isChecked():
            for i in App.ActiveDocument.Objects:
                if i.isDerivedFrom("Part::Feature"):
                    if i.ExpressionEngine:
                        for j in i.ExpressionEngine:
                            i.setExpression(j[0], None)
            App.ActiveDocument.recompute()
            self.close()

        if self.radio2.isChecked():
            for i in App.ActiveDocument.Objects:
                if i.Name == self.expObjs.currentText():
                    if i.ExpressionEngine:
                        for j in i.ExpressionEngine:
                            i.setExpression(j[0], None)
            App.ActiveDocument.recompute()
            self.close()

    def close(self):
        self.dialog.hide()

ExpressionRemover()