我一直在尝试运行此代码，这是错误
File "C:/hari/Academics/python/py programs/gui qt4/book/calculator.py", line 27, in updateUi
text = unicode(self.lineedit.text(),'utf-8')
NameError: name 'unicode' is not defined
代码 ：
from __future__ import division
from math import *
from PyQt4.QtGui import *
from PyQt4.QtCore import *
import sys
class Form(QDialog):
def __init__(self,parent =None):
super(Form,self).__init__(parent)
self.browser =QTextBrowser()
self.lineedit =QLineEdit("type an exp")
self.lineedit.selectAll()
layout=QVBoxLayout()
layout.addWidget(self.browser)
layout.addWidget(self.lineedit)
self.setLayout(layout)
self.lineedit.setFocus()
self.connect(self.lineedit, SIGNAL("returnPressed()"), self.updateUi)
self.setWindowTitle("Calculate")
def updateUi(self):
try:
text = unicode(self.lineedit.text())
print(type(text))
self.browser.append(text+" = <b>"+eval(text)+"</b>" )
except:
self.browser.append("<font color=red>"+ text + " is invalid</font>")
app=QApplication(sys.argv) …