第一部分：UI介面設計
介面效果圖如下：

ui檔案(可拉動控制元件自行建立一個button和text）

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Dialog</class>
 <widget class="QDialog" name="Dialog">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</
 
y>
    <width>585</width>
    <height>394</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Dialog</string>
  </property>
  <widget class="QPushButton" name="pushButton">
   <property name="geometry">
    <
 
rect>
     <x>230</x>
     <y>320</y>
     <width>75</width>
     <height>23</height>
    </rect>
   </property>
   <property name="text">
    <string>timer_click</string>
   </property>
  </widget>
  <widget class=
 
"QTextEdit" name="textEdit">
   <property name="geometry">
    <rect>
     <x>70</x>
     <y>30</y>
     <width>441</width>
     <height>231</height>
    </rect>
   </property>
  </widget>
 </widget>
 <resources/>
 <connections>
  <connection>
   <sender>pushButton</sender>
   <signal>clicked()</signal>
   <receiver>Dialog</receiver>
   <slot>timer_click()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>217</x>
     <y>229</y>
    </hint>
    <hint type="destinationlabel">
     <x>250</x>
     <y>241</y>
    </hint>
   </hints>
  </connection>
 </connections>
 <slots>
  <slot>timer_click()</slot>
 </slots>
</ui>

生成的py檔案

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'TEST_QT_FROM.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(585, 394)
        self.pushButton = QtWidgets.QPushButton(Dialog)
        self.pushButton.setGeometry(QtCore.QRect(230, 320, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.textEdit = QtWidgets.QTextEdit(Dialog)
        self.textEdit.setGeometry(QtCore.QRect(70, 30, 441, 231))
        self.textEdit.setObjectName("textEdit")

        self.retranslateUi(Dialog)
        self.pushButton.clicked.connect(Dialog.timer_click)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.pushButton.setText(_translate("Dialog", "timer_click"))

第二部分：主要邏輯程式碼

from PyQt5 import QtWidgets, QtCore
from testqt.TEST_QT_FROM import Ui_Dialog
import sys
from PyQt5.QtCore import *
import time


# 繼承QThread
class Runthread(QtCore.QThread):
    # python3,pyqt5與之前的版本有些不一樣
    #  通過類成員物件定義訊號物件
    _signal = pyqtSignal(str)

    def __init__(self):
        super(Runthread, self).__init__()

    def __del__(self):
        self.wait()

    def run(self):
        print("run 666")
        self._signal.emit("run 666"); # 訊號傳送



class TestQtFromC(QtWidgets.QWidget, Ui_Dialog):
    text =""
    def __init__(self):
        super(TestQtFromC, self).__init__()
        self.setupUi(self)

    #click
    def timer_click(self):
        self.thread = Runthread() # 建立執行緒
        self.thread._signal.connect(self.callbacklog) # 連線訊號
        self.thread.start() # 開始執行緒

    # callback
    def callbacklog(self, msg):
        self.text =self.text+time.strftime("%Y-%m-%d %H:%M:%S ", time.localtime())+msg+ "\n"
        print(self.text)
        # 回撥資料輸出到文字框
        self.textEdit.setText(self.text);


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    mTestQtFromC = TestQtFromC()
    mTestQtFromC.show()
    sys.exit(app.exec_())

第三部分：執行效果圖

點選click就可重新整理介面了