Home > Article > Backend Development > Python makes a simple calculator through PyQt5 and Eric6
Python makes a simple calculator through PyQt5 and Eric6
- Y2JOriginal
- 2017-05-15 11:21:032938browse
This article mainly introduces a calculator code implemented by python3.5 + PyQt5 +Eric6. The calculator can run perfectly on Windows 7 32-bit system. Those who are interested can learn more.
Simple calculations can currently be implemented. Please reset before calculating. The default number during design is 0. It took me a long time to get this result, but there are many bugs. python3.5 + PyQt5 +Eric6 can run the calculator perfectly on Windows 7 32-bit system. I simply learned it for a long time and drew a picture to implement it. There are bugs. Some buttons have not been implemented yet and will be optimized in the future.
The code structure is as follows:
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_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_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)))
continueuntitled. 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_())Rendering: 
##[Related recommendations]
1 . Special recommendation:
"php Programmer Toolbox" V0.1 version download Python free video tutorialPython application in data science video tutorialThe above is the detailed content of Python makes a simple calculator through PyQt5 and Eric6. For more information, please follow other related articles on the PHP Chinese website!
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn