程序生成截圖：
#以下是GUI圖形界面的創建
from PyQt5import QtCore, QtGui, QtWidgets
from mathimport *
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(800, 599)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.label_2 = QtWidgets.QLabel(self.centralwidget)
self.label_2.setGeometry(QtCore.QRect(70, 90, 41, 16))
self.label_2.setObjectName("label_2")
self.label_5 = QtWidgets.QLabel(self.centralwidget)
self.label_5.setGeometry(QtCore.QRect(70, 150, 41, 9))
self.label_5.setObjectName("label_5")
self.label_6 = QtWidgets.QLabel(self.centralwidget)
self.label_6.setGeometry(QtCore.QRect(50, 230, 41, 9))
self.label_6.setObjectName("label_6")
self.label_3 = QtWidgets.QLabel(self.centralwidget)
self.label_3.setGeometry(QtCore.QRect(270, 90, 41, 16))
self.label_3.setObjectName("label_3")
self.label_7 = QtWidgets.QLabel(self.centralwidget)
self.label_7.setGeometry(QtCore.QRect(270, 150, 41, 9))
self.label_7.setObjectName("label_7")
self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
self.lineEdit.setGeometry(QtCore.QRect(50, 110, 71, 31))
self.lineEdit.setObjectName("lineEdit")
self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
self.lineEdit_2.setGeometry(QtCore.QRect(50, 170, 71, 31))
self.lineEdit_2.setObjectName("lineEdit_2")
self.lineEdit_3 = QtWidgets.QLineEdit(self.centralwidget)
self.lineEdit_3.setGeometry(QtCore.QRect(250, 110, 71, 31))
self.lineEdit_3.setObjectName("lineEdit_3")
self.lineEdit_4 = QtWidgets.QLineEdit(self.centralwidget)
self.lineEdit_4.setGeometry(QtCore.QRect(250, 170, 71, 31))
self.lineEdit_4.setObjectName("lineEdit_4")
self.lineEdit_5 = QtWidgets.QLineEdit(self.centralwidget)
self.lineEdit_5.setGeometry(QtCore.QRect(80, 220, 71, 31))
self.lineEdit_5.setObjectName("lineEdit_5")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(170, 300, 56, 17))
self.pushButton.setObjectName("pushButton")
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 18))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
self.pushButton.clicked.connect(self.btnshanbing_click)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.label_2.setText(_translate("MainWindow", "經度"))
self.label_5.setText(_translate("MainWindow", "經度"))
self.label_6.setText(_translate("MainWindow", "距離"))
self.label_3.setText(_translate("MainWindow", "經度"))
self.label_7.setText(_translate("MainWindow", "經度"))
self.pushButton.setText(_translate("MainWindow", "確定"))
#以下是btnshanbing_click信號的槽函數
def btnshanbing_click(self):
#以下是將文本框裏面的內容讀取出來同時將裏面的類型轉換為浮點型
a=float(self.lineEdit.text())
c=float(self.lineEdit_2.text())
b=float(self.lineEdit_3.text())
d=float(self.lineEdit_4.text())
#以下是經緯度計算公式
e=(acos(sin(b * pi /180) * sin(d * pi /180) + cos(c * pi /180 - a * pi /180) * cos(b * pi /180) * cos(d * pi /180)))*6371004
#以下是將計算的結果生成在LineEdit_5裏面去，但是要註意的是必須將計算的結果轉換為字符型，否則程序運行不起來
? self.lineEdit_5.setText(str(e))
主程序：
self.lineEdit.text()：讀取文本框裏面的內容，但是要做計算必須轉換為float(self.lineEdit.text())浮點型才能做運算，否則不能運算
self.lineEdit_5.setText(str())：將計算的結果生成在另壹個文本框裏面必須轉換為字符型，否則程序會報錯。
綜上所述：lineEdit.text()的返回類型為文本型