python3.5 + PyQt5 +Eric6 实现的一个计算器

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('')
    @pyqtSlot()
    def on_Button_2_clicked(self):
        self.Edit_xianshi.insertPlainText('')
    @pyqtSlot()
    def on_Button_3_clicked(self):
        self.Edit_xianshi.insertPlainText('')
    @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('')
    @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('')
    @pyqtSlot()
    def on_Button_4_clicked(self):
        self.Edit_xianshi.insertPlainText('')
    @pyqtSlot()
    def on_Button_esc_clicked(self):
        self.Edit_xianshi.clear()
    @pyqtSlot()
    def on_Button_7_clicked(self):
        self.Edit_xianshi.insertPlainText('')
    @pyqtSlot()
    def on_Button_1_clicked(self):
        self.Edit_xianshi.insertPlainText('')
    @pyqtSlot()
    def on_Button_5_clicked(self):
        self.Edit_xianshi.insertPlainText('')
    @pyqtSlot()
    def on_Button_xiaoshu_clicked(self):
        self.Edit_xianshi.insertPlainText('.')
    @pyqtSlot()
    def on_Button_0_clicked(self):
        self.Edit_xianshi.insertPlainText('')
    @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", ""))
        self.Button_2.setText(_translate("Dialog", ""))
        self.Button_3.setText(_translate("Dialog", ""))
        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", ""))
        self.Button_chu.setText(_translate("Dialog", "/"))
        self.Button_cheng.setText(_translate("Dialog", "*"))
        self.Button_8.setText(_translate("Dialog", ""))
        self.Button_4.setText(_translate("Dialog", ""))
        self.Button_esc.setText(_translate("Dialog", "esc"))
        self.Button_7.setText(_translate("Dialog", ""))
        self.Button_1.setText(_translate("Dialog", ""))
        self.Button_5.setText(_translate("Dialog", ""))
        self.Button_xiaoshu.setText(_translate("Dialog", "."))
        self.Button_0.setText(_translate("Dialog", ""))
        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：

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