python + PyQt5 达成 简易计算器

突然想起在此以前一直想写个简易的计算器,前些天就写了弹指间,界面有些简陋,可是基本功效达成没相当

图片 1

以下是源码:

# --*-- coding:utf-8 --*--
import sys
from PyQt5 import QtWidgets, QtCore
from PyQt5.QtGui import QFont


class Calculator(QtWidgets.QWidget):

    def __init__(self):
        super(Calculator, self).__init__()
        self.initUI()
        self.reset()
        self.display.setText("0")

    def initUI(self):
        self.resize(600,650)
        self.setWindowTitle('简易计算器')
        Grid = QtWidgets.QGridLayout()

        self.display = QtWidgets.QLineEdit('')
        self.display.setFont(QFont("Times", 20))
        self.display.setReadOnly(True)
        self.display.setAlignment(QtCore.Qt.AlignRight)
        self.display.setMaxLength(20)
        Grid.addWidget(self.display, 0, 0, 1, 4)

        names = ['C', '(', 'Del', '+',
                 '7', '8', '9', '-',
                 '4', '5', '6', '*',
                 '1', '2', '3', '/',
                 '0', '.', ')', '=']
        pos = [(0, 0), (0, 1), (0, 2), (0, 3),
               (1, 0), (1, 1), (1, 2), (1, 3),
               (2, 0), (2, 1), (2, 2), (2, 3),
               (3, 0), (3, 1), (3, 2), (3, 3),
               (4, 0), (4, 1), (4, 2), (4, 3)]
        c = 0
        for name in names:
            button = QtWidgets.QPushButton(name)
            button.setFixedSize(QtCore.QSize(100, 60))
            button.setFont(QFont('Times', 30))
            button.clicked.connect(self.ButtonClicked)  
            Grid.addWidget(button, pos[c][0] + 1, pos[c][1])
            c = c + 1

        self.setLayout(Grid)

    def ButtonClicked(self):
        text = self.sender().text()
        if text == "=":
            r = eval(self.number)
            result = str(r).decode('utf-8')
            self.display.setText(str(result))  #计算结果
            self.number = result

        elif text == "Del":
            self.number = self.number[:-1]
            self.display.setText(self.number)

        elif text == "C":
            self.reset()
            self.display.setText(self.number)

        else:
            if text in "+-*/":
                self.number = self.number + text
            else:
                self.number = self.number + text if self.number != "0" else text
            self.display.setText(self.number)

    def reset(self):
        self.number = "0"


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    ex = Calculator()
    ex.show()
    sys.exit(app.exec_())

 

 

图片 2

 图片 3

代码结构如图:

当前能够兑现轻松的估计。计算前请重新初始化,设计的时候默许数字是0,
学了半天就做出来个那样个结果,bug不菲。 python3.5 + PyQt5 +Eric6
在windows7 31个人系统能够周详运行总计器,轻巧学了半天就画个图完成的留存bug,部分开关还没落到实处,后续优化。

 

 

 

 github
传送门

效果图:

 

 1 jisuan.py
 2 import re
 3 #匹配整数或小数的乘除法,包括了开头存在减号的情况
 4 mul_div=re.compile("(-?\d+)(\.\d+)?(\*|/)(-?\d+)(\.\d+)?")
 5 #匹配整数或小数的加减法,包括了开头存在减号的情况
 6 plus_minus = re.compile("(-?\d+)(\.\d+)?(-|\+)(-?\d+)(\.\d+)?")
 7 #匹配括号
 8 bracket=re.compile("\([^()]*\)")
 9 #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
10 mul_minus_minus = re.compile("(-?\d+)(\.\d+)?(\*-)(\d+)(\.\d+)?")
11 #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
12 div_minus_minus = re.compile("(-?\d+)(\.\d+)?(/-)(\d+)(\.\d+)?")
13 #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
14 def touble_cale(str_expire):
15     if str_expire.count("+") == 1:
16         right_num = float(str_expire[(str_expire.find("+")+1):])
17         left_num = float(str_expire[:str_expire.find("+")])
18         return str(right_num+left_num)
19     elif str_expire[1:].count("-") == 1:
20         right_num = float(str_expire[:str_expire.find("-",1)])
21         left_num = float(str_expire[(str_expire.find("-", 1) + 1):])
22         return str(right_num - left_num)
23     elif str_expire.count("*") == 1:
24         right_num = float(str_expire[:str_expire.find("*")])
25         left_num = float(str_expire[(str_expire.find("*")+1):])
26         return str(right_num * left_num)
27     elif str_expire.count("/") == 1:
28         right_num = float(str_expire[:str_expire.find("/")])
29         left_num = float(str_expire[(str_expire.find("/") + 1):])
30         return str(right_num / left_num)
31 
32 
33 #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
34 def judge_mul_minus(str_expire):
35     #判断公式中乘以负数的部分
36     if len(re.findall("(\*-)", str_expire)) != 0:
37         #调用上面的正则取得*-的公式
38         temp_mul_minus = mul_minus_minus.search(str_expire).group()
39         #将匹配的部分的*-换成*并将-放到前面
40         temp_mul_minus_2 = temp_mul_minus.replace(temp_mul_minus,"-" + temp_mul_minus.replace("*-","*"))
41         #经更改的的部分与原来的部分进行替换
42         str_expire=str_expire.replace(temp_mul_minus,temp_mul_minus_2)
43         return judge_mul_minus(str_expire)
44         #return str_expire
45     # 判断公式中除以负数的部分
46     elif len(re.findall(r"(/-)", str_expire)) != 0:
47         # 调用上面的正则取得/-的公式
48         temp_dev_minus = div_minus_minus.search(str_expire).group()
49         # 将匹配的部分的/-换成/并将-放到前面
50         temp_dev_minus_2 = temp_dev_minus.replace(temp_dev_minus,"-" + temp_dev_minus.replace("/-","/"))
51         # 经更改的的部分与原来的部分进行替换
52         str_expire = str_expire.replace(temp_dev_minus,temp_dev_minus_2)
53         return judge_mul_minus(str_expire)
54     #调用change_sign将公式中的++换成= +-换成-
55     return change_sign(str_expire)
56 
57 #定义一个方法取将--更改为+ +-改为-
58 def change_sign(str_expire):
59     if len(re.findall(r"(\+-)", str_expire)) != 0:
60         str_expire = str_expire.replace("+-", "-")
61         return change_sign(str_expire)
62     elif len(re.findall(r"(--)", str_expire)) != 0:
63         str_expire = str_expire.replace("--", "+")
64         return change_sign(str_expire)
65     return str_expire
66 
67 
68 #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
69 def cale_mix(str_expire):
70     #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
71     while len(re.findall("[-+*/]",str_expire[1:])) != 0:
72         if len(re.findall("(\*|/)",str_expire)) != 0:
73             str_expire = str_expire.replace(mul_div.search(str_expire).group(),touble_cale(mul_div.search(str_expire).group()))
74         elif len(re.findall("(\+|-)",str_expire)) !=0:
75             str_expire = str_expire.replace(plus_minus.search(str_expire).group(),touble_cale(plus_minus.search(str_expire).group()))
76     return str_expire
77 
78 #定义一个方法用于去括号,并调用上述的方法进行计算
79 def remove_bracket(str_expire):
80     #判断公式中是否有括号
81     if len(bracket.findall(str_expire)) == 0:
82         return cale_mix(judge_mul_minus(str_expire))
83     elif len(bracket.findall(str_expire))!=0:
84         while len(bracket.findall(str_expire)) !=0:
85             #print(bracket.search(str_expire).group())
86             #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
87             str_expire = str_expire.replace(bracket.search(str_expire).group(),cale_mix(judge_mul_minus(bracket.search(str_expire).group()[1:-1])))
88         str_expire = cale_mix(judge_mul_minus(str_expire))
89         return str_expire
90 if __name__ == "__main__":
91     while True:
92         user_input_expire = input("请输入你的公式:(不要带空格,q表示退出):")
93         print("%s=%s" %(user_input_expire,remove_bracket(user_input_expire)))
94         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;\">0</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_())

 

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