import re#匹配整數(shù)或小數(shù)的乘除法，包括了開頭存在減號(hào)的情況mul_div=re.compile("(-?/d+)(/./d+)?(/*|/)(-?/d+)(/./d+)?")#匹配整數(shù)或小數(shù)的加減法，包括了開頭存在減號(hào)的情況plus_minus = re.compile("(-?/d+)(/./d+)?(-|/+)(-?/d+)(/./d+)?")#匹配括號(hào)bracket=re.compile("/([^()]*/)")#匹配乘法的時(shí)候出現(xiàn)乘以負(fù)數(shù)的情況，包括了開頭存在減號(hào)的情況mul_minus_minus = re.compile("(-?/d+)(/./d+)?(/*-)(/d+)(/./d+)?")#匹配除法的時(shí)候出現(xiàn)乘以負(fù)數(shù)的情況，包括了開頭存在減號(hào)的情況div_minus_minus = re.compile("(-?/d+)(/./d+)?(/-)(/d+)(/./d+)?")#定義一個(gè)兩位數(shù)的加減乘除法的運(yùn)算，匹配左邊的右邊的數(shù)字和左邊的數(shù)字，然后進(jìn)行計(jì)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)#定義一個(gè)方法用于判斷是否存在乘以負(fù)數(shù)和除以負(fù)數(shù)的情況def judge_mul_minus(str_expire):  #判斷公式中乘以負(fù)數(shù)的部分  if len(re.findall("(/*-)", str_expire)) != 0:    #調(diào)用上面的正則取得*-的公式    temp_mul_minus = mul_minus_minus.search(str_expire).group()    #將匹配的部分的*-換成*并將-放到前面    temp_mul_minus_2 = temp_mul_minus.replace(temp_mul_minus,"-" + temp_mul_minus.replace("*-","*"))    #經(jīng)更改的的部分與原來(lái)的部分進(jìn)行替換    str_expire=str_expire.replace(temp_mul_minus,temp_mul_minus_2)    return judge_mul_minus(str_expire)    #return str_expire  # 判斷公式中除以負(fù)數(shù)的部分  elif len(re.findall(r"(/-)", str_expire)) != 0:    # 調(diào)用上面的正則取得/-的公式    temp_dev_minus = div_minus_minus.search(str_expire).group()    # 將匹配的部分的/-換成/并將-放到前面    temp_dev_minus_2 = temp_dev_minus.replace(temp_dev_minus,"-" + temp_dev_minus.replace("/-","/"))    # 經(jīng)更改的的部分與原來(lái)的部分進(jìn)行替換    str_expire = str_expire.replace(temp_dev_minus,temp_dev_minus_2)    return judge_mul_minus(str_expire)  #調(diào)用change_sign將公式中的++換成= +-換成-  return change_sign(str_expire)#定義一個(gè)方法取將--更改為+ +-改為-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#定義一個(gè)方法用于計(jì)算只有加減乘除的公式，優(yōu)先處理乘法def cale_mix(str_expire):  #如果公式中出現(xiàn)符號(hào)數(shù)字的情況即+5 -6 *8 /8的這種情況直接放回?cái)?shù)字否則則先計(jì)算乘除在處理加減  while len(re.findall("[-+*/]",str_expire[1:])) != 0:    if len(re.findall("(/*|/)",str_expire)) != 0:      str_expire = str_expire.replace(mul_div.search(str_expire).group(),touble_cale(mul_div.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#定義一個(gè)方法用于去括號(hào),并調(diào)用上述的方法進(jìn)行計(jì)算def remove_bracket(str_expire):  #判斷公式中是否有括號(hào)  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())      #只有存在括號(hào)優(yōu)先處理括號(hào)中的內(nèi)容并對(duì)內(nèi)容進(jìn)行替換，直到?jīng)]有括號(hào)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("請(qǐng)輸入你的公式:(不要帶空格,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'零不能作為分母')      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:/Users/Administrator/Desktop/pyqt5/untitled.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/";/n""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", "<!DOCTYPE HTML PUBLIC /"-//W3C//DTD HTML 4.0//EN/" /"http://www.w3.org/TR/REC-html40/strict.dtd/">/n""<html><head><meta name=/"qrichtext/" content=/"1/" /><style type=/"text/css/">/n""p, li { white-space: pre-wrap; }/n""</style></head><body style=/" font-family:/'Aharoni/'; font-size:16pt; font-weight:72; font-style:normal;/">/n""<p style=/" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;/"><span style=/" font-family:/'SimSun/'; font-weight:400;/">0</span></p></body></html>"))    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_())