在以下程序中，当我按“ =”获取结果时，计算器gui正在关闭。我认为eval函数存在一些问题。如果我删除评估，那么程序没有任何问题。需要帮助弄清楚这一点。除此以外，还有其他方法可以尝试吗？预先感谢。
class Calci(QWidget):
def __init__(self, Parent=None):
super(Calci,self).__init__()
self.initgui()
def initgui(self):
self.list1=
["%","rt","pow","1/x","CE","C","BCK","/","7","8","9","*","4","5","6","-
","1","2","3","+","+-","0",".","="]
self.list2=[(i,j) for i in range(2,8) for j in range(0,4)]
self.button={}
self.data1=""
self.data2=0
self.lineedit=QLineEdit()
self.lineedit.setFocus()
grid=QGridLayout()
self.setLayout(grid)
self.font=QFont("Bookman Old Style",15,25)
self.lineedit.setFont(self.font)
for x,y in zip(self.list1,self.list2):
self.button[y]=QPushButton(x)
grid.addWidget(self.lineedit,0,0,2,4)
self.lineedit.setSizePolicy(QSizePolicy.Preferred,QSizePolicy.Expanding)
self.lineedit.setMinimumHeight(70)
grid.addWidget(self.button[y],*y)
self.button[y].setSizePolicy(QSizePolicy.Preferred,QSizePolicy.Expanding)
self.button[y].setMinimumHeight(70)
self.lineedit.setAlignment(Qt.AlignRight)
self.button[y].clicked.connect(lambda state,x=x: self.click(x))
def click(self,n):
if (n=="="):
data1=self.lineedit.text()
self.lineedit.clear()
self.lineedit.insert(eval(data1))
else:
self.lineedit.insert(n)
app=QApplication(sys.argv)
calci=Calci()
calci.show()
app.exec_()