python3.5 + PyQt5 +Eric6实现的一个计算器方法（附代码）

import re#匹配整数或小数的乘除法，包括了开头存在减号的情况mul_p=re.compile("(-?d+)(.d+)?(*|/)(-?d+)(.d+)?")#匹配整数或小数的加减法，包括了开头存在减号的情况plus_minus = re.compile("(-?d+)(.d+)?(-|+)(-?d+)(.d+)?")#匹配括号bracket=re.compile("([^()]*)")#匹配乘法的时候出现乘以负数的情况，包括了开头存在减号的情况mul_minus_minus = re.compile("(-?d+)(.d+)?(*-)(d+)(.d+)?")#匹配除法的时候出现乘以负数的情况，包括了开头存在减号的情况p_minus_minus = re.compile("(-?d+)(.d+)?(/-)(d+)(.d+)?")#定义一个两位数的加减乘除法的运算，匹配左边的右边的数字和左边的数字，然后进行计算def touble_cale(str_expire):  if str_expire.count("+") == 1:    right_num = float(str_expire[(str_expire.find("+")+1):])    left_num = float(str_expire[:str_expire.find("+")])    return str(right_num+left_num)  elif str_expire[1:].count("-") == 1:    right_num = float(str_expire[:str_expire.find("-",1)])    left_num = float(str_expire[(str_expire.find("-", 1) + 1):])    return str(right_num - left_num)  elif str_expire.count("*") == 1:    right_num = float(str_expire[:str_expire.find("*")])    left_num = float(str_expire[(str_expire.find("*")+1):])    return str(right_num * left_num)  elif str_expire.count("/") == 1:    right_num = float(str_expire[:str_expire.find("/")])    left_num = float(str_expire[(str_expire.find("/") + 1):])    return str(right_num / left_num)#定义一个方法用于判断是否存在乘以负数和除以负数的情况def judge_mul_minus(str_expire):  #判断公式中乘以负数的部分  if len(re.findall("(*-)", str_expire)) != 0:    #调用上面的正则取得*-的公式    temp_mul_minus = mul_minus_minus.search(str_expire).group()    #将匹配的部分的*-换成*并将-放到前面    temp_mul_minus_2 = temp_mul_minus.replace(temp_mul_minus,"-" + temp_mul_minus.replace("*-","*"))    #经更改的的部分与原来的部分进行替换    str_expire=str_expire.replace(temp_mul_minus,temp_mul_minus_2)    return judge_mul_minus(str_expire)    #return str_expire  # 判断公式中除以负数的部分  elif len(re.findall(r"(/-)", str_expire)) != 0:    # 调用上面的正则取得/-的公式    temp_dev_minus = p_minus_minus.search(str_expire).group()    # 将匹配的部分的/-换成/并将-放到前面    temp_dev_minus_2 = temp_dev_minus.replace(temp_dev_minus,"-" + temp_dev_minus.replace("/-","/"))    # 经更改的的部分与原来的部分进行替换    str_expire = str_expire.replace(temp_dev_minus,temp_dev_minus_2)    return judge_mul_minus(str_expire)  #调用change_sign将公式中的++换成= +-换成-  return change_sign(str_expire)#定义一个方法取将--更改为+ +-改为-def change_sign(str_expire):  if len(re.findall(r"(+-)", str_expire)) != 0:    str_expire = str_expire.replace("+-", "-")    return change_sign(str_expire)  elif len(re.findall(r"(--)", str_expire)) != 0:    str_expire = str_expire.replace("--", "+")    return change_sign(str_expire)  return str_expire#定义一个方法用于计算只有加减乘除的公式，优先处理乘法def cale_mix(str_expire):  #如果公式中出现符号数字的情况即+5 -6 *8 /8的这种情况直接放回数字否则则先计算乘除在处理加减  while len(re.findall("[-+*/]",str_expire[1:])) != 0:    if len(re.findall("(*|/)",str_expire)) != 0:      str_expire = str_expire.replace(mul_p.search(str_expire).group(),touble_cale(mul_p.search(str_expire).group()))    elif len(re.findall("(+|-)",str_expire)) !=0:      str_expire = str_expire.replace(plus_minus.search(str_expire).group(),touble_cale(plus_minus.search(str_expire).group()))  return str_expire#定义一个方法用于去括号,并调用上述的方法进行计算def remove_bracket(str_expire):  #判断公式中是否有括号  if len(bracket.findall(str_expire)) == 0:    return cale_mix(judge_mul_minus(str_expire))  elif len(bracket.findall(str_expire))!=0:    while len(bracket.findall(str_expire)) !=0:      #print(bracket.search(str_expire).group())      #只有存在括号优先处理括号中的内容并对内容进行替换，直到没有括号位置      str_expire = str_expire.replace(bracket.search(str_expire).group(),cale_mix(judge_mul_minus(bracket.search(str_expire).group()[1:-1])))    str_expire = cale_mix(judge_mul_minus(str_expire))    return str_expireif name == "main":  while True:    user_input_expire = input("请输入你的公式:(不要带空格,q表示退出):")    print("%s=%s" %(user_input_expire,remove_bracket(user_input_expire)))    continue

# -*- coding: utf-8 -*-from PyQt5.QtCore import *from PyQt5.QtWidgets import *from PyQt5 import QtCore, QtGui, QtWidgetsfrom Ui_untitled import Ui_Dialogfrom jisuan import remove_bracketclass Dialog(QDialog, Ui_Dialog):  def init(self, parent=None):    super(Dialog, self).init(parent)    self.setupUi(self)  @pyqtSlot()  def on_Button_6_clicked(self):    self.Edit_xianshi.insertPlainText('6')  @pyqtSlot()  def on_Button_2_clicked(self):    self.Edit_xianshi.insertPlainText('2')  @pyqtSlot()  def on_Button_3_clicked(self):    self.Edit_xianshi.insertPlainText('3')  @pyqtSlot()  def on_Button_pingfang_clicked(self):    me=self.Edit_xianshi.toPlainText()    m=int(me) *int(me)    self.Edit_xianshi.clear()    self.Edit_xianshi.append(str(m))  @pyqtSlot()  def on_Button_add_clicked(self):    h=self.Edit_xianshi.toPlainText()    self.Edit_xianshi.clear()    self.Edit_xianshi.append(h+'+')  @pyqtSlot()  def on_Button_jian_clicked(self):    h = self.Edit_xianshi.toPlainText()    self.Edit_xianshi.clear()    self.Edit_xianshi.append(h + '-')  @pyqtSlot()  def on_Button_9_clicked(self):    self.Edit_xianshi.insertPlainText('9')  @pyqtSlot()  def on_Button_chu_clicked(self):    h = self.Edit_xianshi.toPlainText()    self.Edit_xianshi.clear()    self.Edit_xianshi.append(h + '/')  @pyqtSlot()  def on_Button_cheng_clicked(self):    h = self.Edit_xianshi.toPlainText()    self.Edit_xianshi.clear()    self.Edit_xianshi.append(h + '*')  @pyqtSlot()  def on_Button_8_clicked(self):    self.Edit_xianshi.insertPlainText('8')  @pyqtSlot()  def on_Button_4_clicked(self):    self.Edit_xianshi.insertPlainText('4')  @pyqtSlot()  def on_Button_esc_clicked(self):    self.Edit_xianshi.clear()  @pyqtSlot()  def on_Button_7_clicked(self):    self.Edit_xianshi.insertPlainText('7')  @pyqtSlot()  def on_Button_1_clicked(self):    self.Edit_xianshi.insertPlainText('1')  @pyqtSlot()  def on_Button_5_clicked(self):    self.Edit_xianshi.insertPlainText('5')  @pyqtSlot()  def on_Button_xiaoshu_clicked(self):    self.Edit_xianshi.insertPlainText('.')  @pyqtSlot()  def on_Button_0_clicked(self):    self.Edit_xianshi.insertPlainText('0')  @pyqtSlot()  def on_Button_dengyu_clicked(self):    pe=self.Edit_xianshi.toPlainText()    m=remove_bracket(pe)    self.Edit_xianshi.clear()    self.Edit_xianshi.append(str(m))  def on_Button_fenzhi_clicked(self):    pe = self.Edit_xianshi.toPlainText()    if int(pe) ==0:      QMessageBox.information(self,u'提示',u'零不能作为分母')      Dialog()    else:      m=1/(int(pe))      self.Edit_xianshi.clear()      self.Edit_xianshi.append(str(m))      Dialog()if name =="main":  import sys  app = QtWidgets.QApplication(sys.argv)  app.processEvents()  ui = Dialog()  ui.show()  sys.exit(app.exec_())

# -*- coding: utf-8 -*-# Form implementation generated from reading ui file 'C:UsersAdministratorDesktoppyqt5untitled.ui'## Created by: PyQt5 UI code generator 5.5## WARNING! All changes made in this file will be lost!from PyQt5 import QtCore, QtGui, QtWidgetsclass Ui_Dialog(object):  def setupUi(self, Dialog):    Dialog.setObjectName("Dialog")    Dialog.resize(357, 320)    Dialog.setStyleSheet("font: 75 16pt "Aharoni";""background-color: rgb(206, 255, 251);")    self.label = QtWidgets.QLabel(Dialog)    self.label.setGeometry(QtCore.QRect(201, 210, 301, 21))    self.label.setText("")    self.label.setObjectName("label")    self.Edit_xianshi = QtWidgets.QTextEdit(Dialog)    self.Edit_xianshi.setGeometry(QtCore.QRect(0, 0, 351, 41))    self.Edit_xianshi.setStyleSheet("font: 75 16pt "Aharoni";")    self.Edit_xianshi.setObjectName("Edit_xianshi")    self.gridLayoutWidget = QtWidgets.QWidget(Dialog)    self.gridLayoutWidget.setGeometry(QtCore.QRect(0, 30, 351, 281))    self.gridLayoutWidget.setObjectName("gridLayoutWidget")    self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)    self.gridLayout.setObjectName("gridLayout")    self.Button_6 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_6.setObjectName("Button_6")    self.gridLayout.addWidget(self.Button_6, 2, 2, 1, 1)    self.Button_2 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_2.setObjectName("Button_2")    self.gridLayout.addWidget(self.Button_2, 3, 1, 1, 1)    self.Button_3 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_3.setObjectName("Button_3")    self.gridLayout.addWidget(self.Button_3, 3, 2, 1, 1)    self.Button_fenzhi = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_fenzhi.setObjectName("Button_fenzhi")    self.gridLayout.addWidget(self.Button_fenzhi, 1, 3, 1, 1)    self.Button_pingfang = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_pingfang.setObjectName("Button_pingfang")    self.gridLayout.addWidget(self.Button_pingfang, 0, 3, 1, 1)    self.Button_add = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_add.setObjectName("Button_add")    self.gridLayout.addWidget(self.Button_add, 2, 3, 1, 1)    self.Button_jian = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_jian.setObjectName("Button_jian")    self.gridLayout.addWidget(self.Button_jian, 3, 3, 1, 1)    self.Button_9 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_9.setObjectName("Button_9")    self.gridLayout.addWidget(self.Button_9, 1, 2, 1, 1)    self.Button_chu = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_chu.setObjectName("Button_chu")    self.gridLayout.addWidget(self.Button_chu, 0, 2, 1, 1)    self.Button_cheng = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_cheng.setObjectName("Button_cheng")    self.gridLayout.addWidget(self.Button_cheng, 0, 1, 1, 1)    self.Button_8 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_8.setObjectName("Button_8")    self.gridLayout.addWidget(self.Button_8, 1, 1, 1, 1)    self.Button_4 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_4.setObjectName("Button_4")    self.gridLayout.addWidget(self.Button_4, 2, 0, 1, 1)    self.Button_esc = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_esc.setObjectName("Button_esc")    self.gridLayout.addWidget(self.Button_esc, 0, 0, 1, 1)    self.Button_7 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_7.setObjectName("Button_7")    self.gridLayout.addWidget(self.Button_7, 1, 0, 1, 1)    self.Button_1 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_1.setObjectName("Button_1")    self.gridLayout.addWidget(self.Button_1, 3, 0, 1, 1)    self.Button_5 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_5.setObjectName("Button_5")    self.gridLayout.addWidget(self.Button_5, 2, 1, 1, 1)    self.pushButton_17 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.pushButton_17.setText("")    self.pushButton_17.setObjectName("pushButton_17")    self.gridLayout.addWidget(self.pushButton_17, 4, 0, 1, 1)    self.Button_xiaoshu = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_xiaoshu.setObjectName("Button_xiaoshu")    self.gridLayout.addWidget(self.Button_xiaoshu, 4, 1, 1, 1)    self.Button_0 = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_0.setStyleSheet("")    self.Button_0.setObjectName("Button_0")    self.gridLayout.addWidget(self.Button_0, 4, 2, 1, 1)    self.Button_dengyu = QtWidgets.QPushButton(self.gridLayoutWidget)    self.Button_dengyu.setObjectName("Button_dengyu")    self.gridLayout.addWidget(self.Button_dengyu, 4, 3, 1, 1)    self.retranslateUi(Dialog)    QtCore.QMetaObject.connectSlotsByName(Dialog)  def retranslateUi(self, Dialog):    _translate = QtCore.QCoreApplication.translate    Dialog.setWindowTitle(_translate("Dialog", "Dialog"))    self.Edit_xianshi.setHtml(_translate("Dialog", "nbsp;HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd"&gt;""<meta><style>""p, li { white-space: pre-wrap; }""</style>""<p><span>0</span></p>"))    self.Button_6.setText(_translate("Dialog", "6"))    self.Button_2.setText(_translate("Dialog", "2"))    self.Button_3.setText(_translate("Dialog", "3"))    self.Button_fenzhi.setText(_translate("Dialog", "1/^"))    self.Button_pingfang.setText(_translate("Dialog", "^2"))    self.Button_add.setText(_translate("Dialog", "+"))    self.Button_jian.setText(_translate("Dialog", "-"))    self.Button_9.setText(_translate("Dialog", "9"))    self.Button_chu.setText(_translate("Dialog", "/"))    self.Button_cheng.setText(_translate("Dialog", "*"))    self.Button_8.setText(_translate("Dialog", "8"))    self.Button_4.setText(_translate("Dialog", "4"))    self.Button_esc.setText(_translate("Dialog", "esc"))    self.Button_7.setText(_translate("Dialog", "7"))    self.Button_1.setText(_translate("Dialog", "1"))    self.Button_5.setText(_translate("Dialog", "5"))    self.Button_xiaoshu.setText(_translate("Dialog", "."))    self.Button_0.setText(_translate("Dialog", "0"))    self.Button_dengyu.setText(_translate("Dialog", "="))if name == "main":  import sys  app = QtWidgets.QApplication(sys.argv)  Dialog = QtWidgets.QDialog()  ui = Ui_Dialog()  ui.setupUi(Dialog)  Dialog.show()  sys.exit(app.exec_())