Question

我有一个QListWidget，它有一些项目，我有＆＃34;删除＆＃34;我的表单上的按钮实际上从列表（数组对象）和QlistWidget中删除项目。

＆＃34;添加＆＃34;用于将项目添加到数组obj并将其显示给QlistWidget的按钮，问题是当我按下删除而不从列表中选择任何项目时，默认情况下将该项目置于lats索引并将其删除，并且QlistWidget没有刷新当我按下删除按钮时。

我很困惑如何解释它，需要先尝试代码

这是我的代码：

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from netmiko import ConnectHandler
from paramiko import SSHException
import jtextfsm as textfsm
import ipaddress
import time

class Widget(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent=parent)
        self.device_list = [] #object array
        self.setWindowTitle("Network Automation")
        ############################# Input IP

        # Device Type
        lb_device_list = QLabel(self)
        lb_device_list.setText('Device Type')
        self.cb_device_list = QComboBox(self)
        self.cb_device_list.addItem('cisco_ios')
        self.cb_device_list.addItem('cisco_s300')

        # Ip Device
        lb_ip = QLabel(self)
        lb_ip.setText('IP Address')
        self.le_ip = QLineEdit(self)
        self.le_ip.setText('')
        self.le_ip.setPlaceholderText('Input Device IP')
        self.le_ip.setFixedWidth(150)

        # username
        lb_username = QLabel(self)
        self.le_username = QLineEdit(self)
        lb_username.setText('Username')
        self.le_username.setText('')
        self.le_username.setPlaceholderText('Input Username')
        self.le_username.setFixedWidth(150)

        # password
        lb_password = QLabel(self)
        self.le_password = QLineEdit(self)
        lb_password.setText('Password')
        self.le_password.setText('')
        self.le_password.setPlaceholderText('Input Password')
        self.le_password.setFixedWidth(150)

        # Privilage Password
        lb_enable = QLabel(self)
        lb_enable.setText('Privilege Mode Password')
        self.le_enable = QLineEdit(self)
        self.le_enable.setText('')
        self.le_enable.setPlaceholderText('Input Enable Password')
        self.le_enable.setFixedWidth(150)

        #button generate and add
        btgenerate = QPushButton(self)
        btgenerate.setText('Generate')
        btgenerate.setFixedWidth(70)
        btadd = QPushButton(self)
        btadd.setText('Add')

        #button delete
        btdel = QPushButton(self)
        btdel.setFixedWidth(70)
        btdel.setText('Remove')

        # line
        line = QFrame(self)
        line.setFrameShape(QFrame.VLine)
        line.setFrameShadow(QFrame.Sunken)
        line.setLineWidth(3)

        ########################### Layout Ip Device List

        lb3 = QLabel(self)
        lb3.setText('IP Device List')
        self.ip_device_list = QListWidget(self)
        self.ip_device_list.setFixedWidth(150)
        #self.combobox_ip_list = QComboBox(self)
        #self.combobox_ip_list.setFixedWidth(170)

        ############################## SubLayout and Layout
        hblayout = QHBoxLayout()
        hblayout.addWidget(btgenerate)
        hblayout.addWidget(btadd)

        sublayout = QVBoxLayout()
        sublayout.addWidget(lb_device_list)
        sublayout.addWidget(self.cb_device_list)
        sublayout.addWidget(lb_ip)
        sublayout.addWidget(self.le_ip)
        sublayout.addWidget(lb_username)
        sublayout.addWidget(self.le_username)
        sublayout.addWidget(lb_password)
        sublayout.addWidget(self.le_password)
        sublayout.addWidget(lb_enable)
        sublayout.addWidget(self.le_enable)
        sublayout.addLayout(hblayout)

        sublayout2 = QVBoxLayout()
        sublayout2.addWidget(lb3)
        sublayout2.addWidget(self.ip_device_list)
        #sublayout2.addWidget(self.combobox_ip_list)
        sublayout2.addWidget(btdel)
        sublayout2.addStretch(1)

        layout = QGridLayout(self)
        layout.addLayout(sublayout,0,0)
        layout.addWidget(line,0,1)
        layout.addLayout(sublayout2,0,2)

        btadd.clicked.connect(self.addDevice)

        btdel.clicked.connect(self.remove)



    ####################----------- AddDevice
    def addDevice(self):
        try:
            ip = self.le_ip.text()
            ipaddress.ip_address(ip)
            device_type = str(self.cb_device_list.currentText())
            username = self.le_username.text()
            password = self.le_password.text()
            secret = self.le_enable.text()
            command = 'show tech'
            self.device_list.append(MyClass(device_type, ip, username, password, secret, command))

            # self.combobox_ip_list.addItem(ip)# Add Ip to ComboBox
            self.ip_device_list.addItem(ip)

            self.le_ip.clear()
            self.le_username.clear()
            self.le_password.clear()
            self.le_enable.clear()
            #self.ip_device_list.clear()
            for list in self.device_list:
                print(list.ip,list.device_type)
        except ValueError:
            print("insert you're ip correctly")

    def remove(self):
        index = self.ip_device_list.currentRow()
        self.ip_device_list.takeItem(index)
        del self.device_list[index] #dremove data from list/array



class MyClass(object):
    def __init__(self, device_type=None, ip=None, username=None, password=None, secret=None, command=None):
        self.device_type = device_type
        self.ip = ip
        self.username = username
        self.password = password
        self.secret = secret
        self.command = command


##################################
app = QApplication(sys.argv)
QApplication.processEvents()
app.setStyle('cleanlooks')
window = Widget()
window.show()
sys.exit(app.exec_())

Answer 1

原因是如果没有做出选择，currentRow方法将返回-1。 -1在Python索引中具有非常特殊的含义。它表示最后一个元素（-2表示前一个元素）。因此，要解决您的问题，只需在代码中添加以下内容：

def remove(self):
    index = self.ip_device_list.currentRow()
    if index != -1:
        self.ip_device_list.takeItem(index)
        del self.device_list[index]

默认情况下选择QListWidget项索引

1 个答案: