目前可以实现简单的计算。计算前请重置，设计的时候默认数字是0，
学了半天就做出来个这么个结果，bug不少。 python3.5 + PyQt5 +Eric6 在windows7 32位系统可以完美运行 计算器，简单学了半天就画个图实现的存在bug，部分按钮还未实现，后续优化。
代码结构如图：
jisuan.py 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_div=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 div_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 = div_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_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_expire if __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
untitled.py # -*- coding: utf-8 -*- from PyQt5.QtCore import * from PyQt5.QtWidgets import * from PyQt5 import QtCore, QtGui, QtWidgets from Ui_untitled import Ui_Dialog from jisuan import remove_bracket class 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_())
Ui_untitled.py # -*- 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, QtWidgets class 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_())
效果图：
