在使用pycharm进行编写代码的时候，发现信号设置了connect一个槽，但是测试发现没有起作用，另外，在pycharm编辑器上connect提示没有这个函数，总是找不到原因，后面决定还是对碰到相应的知识点需要做对应的测试用例进行学习和验证。

    下面这个是对信号+槽的一个典型实例。可以正常按预期运行，在pycharm中connect也显示没有这个函数，应该就是pycharm本身设置和提示的问题，后面忽略它。所以有时候也不能钻牛角尖，pycharm也仅仅是个编辑器而已。

#-*- coding:utf-8 -*-
'''
Signal & Slot
'''
__author__ = 'Tony Zhu'

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (QWidget, QLCDNumber, QSlider,QGridLayout,QLabel,QHBoxLayout, QGroupBox,
    QVBoxLayout, QApplication,QProgressBar,QPushButton,QMessageBox)


class SignalSlot(QWidget):

    def __init__(self):
        super(SignalSlot,self).__init__()
        self.initUI()


    def initUI(self):

        self.controlsGroup = QGroupBox("运行样本")
        self.lcdNumber = QLCDNumber(self)
        self.slider = QSlider(Qt.Horizontal, self)
        self.pBar = QProgressBar(self)
        vbox = QVBoxLayout()
        vbox.addWidget(self.pBar)
        vbox.addWidget(self.lcdNumber)
        vbox.addWidget(self.slider)
        self.controlsGroup.setLayout(vbox)

        controlsLayout = QGridLayout()
        self.label1 = QLabel("保存状态：")
        self.saveLabel = QLabel()
        self.label2 = QLabel("运行状态：")
        self.runLabel = QLabel()
        self.buttonSave = QPushButton("保存")
        self.buttonRun = QPushButton("运行")
        self.buttonStop = QPushButton("停止")
        self.buttonDisconnect = QPushButton("解除关联")
        self.buttonConnect = QPushButton("绑定关联")

        controlsLayout.addWidget(self.label1,0,0)
        controlsLayout.addWidget(self.saveLabel,0,1)
        controlsLayout.addWidget(self.label2,1,0)
        controlsLayout.addWidget(self.runLabel,1,1)
        controlsLayout.addWidget(self.buttonSave,2,0)
        controlsLayout.addWidget(self.buttonRun,2,1)
        controlsLayout.addWidget(self.buttonStop,2,2)
        controlsLayout.addWidget(self.buttonDisconnect,3,0)
        controlsLayout.addWidget(self.buttonConnect,3,1)

        layout = QHBoxLayout()
        layout.addWidget(self.controlsGroup)
        layout.addLayout(controlsLayout)
        self.setLayout(layout)

        self.buttonRun.clicked.connect(self.buttonSave.clicked)
        self.slider.valueChanged.connect(self.pBar.setValue)
        self.slider.valueChanged.connect(self.lcdNumber.display)
        self.buttonSave.clicked.connect(self.showMessage)
        self.buttonRun.clicked.connect(self.showMessage)
        self.buttonDisconnect.clicked.connect(self.unbindConnection)
        self.buttonConnect.clicked.connect(self.bindConnection)
        self.buttonStop.clicked.connect(self.stop)

        self.setGeometry(300, 500, 500, 180)
        self.setWindowTitle('信号和槽')

    def showMessage(self):
        if self.sender().text() == "保存":
            self.saveLabel.setText("Saved")
        elif self.sender().text() == "运行":
            self.saveLabel.setText("Saved")
            self.runLabel.setText("Running")

    def unbindConnection(self):
        self.slider.valueChanged.disconnect()
    def bindConnection(self):
        self.slider.valueChanged.connect(self.pBar.setValue)
        self.slider.valueChanged.connect(self.lcdNumber.display)
    def stop(self):
        self.saveLabel.setText("")
        self.runLabel.setText("")

if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = SignalSlot()
    ex.show()
    sys.exit(app.exec_())