使用qt designer设计了一个求视场角的窗口，但一直不知道怎么在lineedit中获取数字去计算，而且代码中应该也有一些别的问题，求解决

Question

问题遇到的现象和发生背景

主代码

import sys
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWidgets import QDialog
from jsscjck import Ui_Dialog
import math

def comput_degree(a_f, f_f):
    degree = 2 * math.atan(a_f / f_f / 2)
    return degree

class Using_test(QDialog, Ui_Dialog):
    def __init__(self, *args, **kwargs):
        super(Using_test, self).__init__(*args, **kwargs)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.calcu())

    def calcu(self):
        a = self.lineEdit.text().todouble()
        b = self.lineEdit_2.text().todouble()
![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/627209855246151.png "#left")

        f = self.lineEdit_3.text().todouble()
        alpha = math.degrees(comput_degree(a, f))
        beta = math.degrees(comput_degree(b, f))
        print("alpha = %.4f" % alpha)
        print("beta = %.4f" % beta)
        self.lineEdit_4.setText(alpha)
        self.lineEdit_5.setText(beta)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = Using_test()
    win.show()
    sys.exit(app.exec_())
窗体代码
# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'D:\python\python_work\计算视场角.ui'
#
# Created by: PyQt5 UI code generator 5.9.2
#
# 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(610, 345)
        self.label = QtWidgets.QLabel(Dialog)
        self.label.setGeometry(QtCore.QRect(120, 100, 31, 31))
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(Dialog)
        self.label_2.setGeometry(QtCore.QRect(120, 140, 31, 31))
        self.label_2.setObjectName("label_2")
        self.label_3 = QtWidgets.QLabel(Dialog)
        self.label_3.setGeometry(QtCore.QRect(116, 180, 31, 31))
        self.label_3.setObjectName("label_3")
        self.lineEdit = QtWidgets.QLineEdit(Dialog)
        self.lineEdit.setGeometry(QtCore.QRect(150, 100, 113, 31))
        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(Dialog)
        self.lineEdit_2.setGeometry(QtCore.QRect(150, 140, 113, 31))
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.lineEdit_3 = QtWidgets.QLineEdit(Dialog)
        self.lineEdit_3.setGeometry(QtCore.QRect(150, 180, 113, 31))
        self.lineEdit_3.setObjectName("lineEdit_3")
        self.pushButton = QtWidgets.QPushButton(Dialog)
        self.pushButton.setGeometry(QtCore.QRect(240, 240, 92, 28))
        self.pushButton.setObjectName("pushButton")
        self.label_4 = QtWidgets.QLabel(Dialog)
        self.label_4.setGeometry(QtCore.QRect(330, 110, 72, 31))
        self.label_4.setObjectName("label_4")
        self.label_5 = QtWidgets.QLabel(Dialog)
        self.label_5.setGeometry(QtCore.QRect(330, 150, 72, 31))
        self.label_5.setObjectName("label_5")
        self.lineEdit_4 = QtWidgets.QLineEdit(Dialog)
        self.lineEdit_4.setGeometry(QtCore.QRect(400, 110, 113, 31))
        self.lineEdit_4.setObjectName("lineEdit_4")
        self.lineEdit_5 = QtWidgets.QLineEdit(Dialog)
        self.lineEdit_5.setGeometry(QtCore.QRect(400, 150, 113, 31))
        self.lineEdit_5.setObjectName("lineEdit_5")

        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
        self.label.setText(_translate("Dialog", "a："))
        self.label_2.setText(_translate("Dialog", "b："))
        self.label_3.setText(_translate("Dialog", "f："))
        self.pushButton.setText(_translate("Dialog", "计算"))
        self.label_4.setText(_translate("Dialog", "水平角α："))
        self.label_5.setText(_translate("Dialog", "垂直角β："))

窗体见附图

我想在左侧的三个lineedit里面输入数字，然后通过函数计算输出在右面的两个里面。

Answer 1

connect链接的函数不需要括号self.pushButton.clicked.connect(self.calcu)，字符串转浮点使用float

class Using_test(QDialog, Ui_Dialog):
    def __init__(self, *args, **kwargs):
        super(Using_test, self).__init__(*args, **kwargs)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.calcu)

    def calcu(self):
        a = self.lineEdit.text()
        b = self.lineEdit_2.text()
        f = self.lineEdit_3.text()
        alpha = math.degrees(comput_degree(float(a), float(f)))
        beta = math.degrees(comput_degree(float(a), float(f)))
        print("alpha = %.4f" % alpha)
        print("beta = %.4f" % beta)
        self.lineEdit_4.setText(str(alpha))
        self.lineEdit_5.setText(str(beta))