一 .写在前面
学习PyQT时拿来练手的，其中UI是自己写的，逻辑部分参考了网上的代码，在此提出感谢！如侵立删~
二.上代码
#!/usr/bin/env python
# -*- coding:UTF-8 -*-
# calculator
import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class UI_form(QWidget):
def __init__(self,parent = None):
QWidget.__init__(self)
self.setWindowTitle('UI')
grid = QGridLayout() #网格式布局
global lcd
lcd = QTextBrowser()
lcd.setFixedHeight(90)
lcd.setFont(QFont("Microsoft YaHei", 20))
lcd.setText('0'.decode('utf-8'))
grid.setSpacing(0)
grid.addWidget(lcd, 0, 0, 1, 5)
# ---------------------按钮定义及显示-------------------------
button_0 = QPushButton('0')
grid.addWidget(button_0,5,0)
button_1 = QPushButton('1')
grid.addWidget(button_1,4,0)
button_2 = QPushButton('2')
grid.addWidget(button_2,4,1)
button_3 = QPushButton('3')
grid.addWidget(button_3,4,2)
button_4 = QPushButton('4')
grid.addWidget(button_4,3,0)
button_5 = QPushButton('5')
grid.addWidget(button_5,3,1)
button_6 = QPushButton('6')
grid.addWidget(button_6,3,2)
button_7 = QPushButton('7')
grid.addWidget(button_7,2,0)
button_8 = QPushButton('8')
grid.addWidget(button_8,2,1)
button_9 = QPushButton('9')
grid.addWidget(button_9,2,2)
button_plus = QPushButton('+')
grid.addWidget(button_plus,2,3)
button_dec = QPushButton('-')
grid.addWidget(button_dec,3,3)
button_mul = QPushButton('*')
grid.addWidget(button_mul,4,3)
button_dev = QPushButton('/')
grid.addWidget(button_dev,5,3)
button_eq = QPushButton('=')
grid.addWidget(button_eq,5,2)
button_point = QPushButton('.')
grid.addWidget(button_point,5,1)
button_close = QPushButton('Close')
grid.addWidget(button_close,1,0)
button_clear = QPushButton('Clear')
grid.addWidget(button_clear,1,1)
button_blk = QPushButton('Blk')
grid.addWidget(button_blk,1,2)
#--------------------------------------------------
self.setLayout(grid)
self.resize(350, 300)
self.str1 = ''#接收第一个要运算的数
self.str2 = ''#接收第二个要运算的数
self.flag = '0'
self.calFlag = ''
lcd.setText(self.str1)
#数字键事件处理
QObject.connect(button_7,SIGNAL("clicked()"),self.func_button7)
QObject.connect(button_8,SIGNAL("clicked()"),self.func_button8)
QObject.connect(button_9,SIGNAL("clicked()"),self.func_button9)
QObject.connect(button_4,SIGNAL("clicked()"),self.func_button4)
QObject.connect(button_5,SIGNAL("clicked()"),self.func_button5)
QObject.connect(button_6,SIGNAL("clicked()"),self.func_button6)
QObject.connect(button_1,SIGNAL("clicked()"),self.func_button1)
QObject.connect(button_2,SIGNAL("clicked()"),self.func_button2)
QObject.connect(button_3,SIGNAL("clicked()"),self.func_button3)
QObject.connect(button_0,SIGNAL("clicked()"),self.func_button0)
#运算符按键事件处理
QObject.connect(button_plus,SIGNAL("clicked()"),self.func_buttonAdd)
QObject.connect(button_dec,SIGNAL("clicked()"),self.func_buttonDec)
QObject.connect(button_mul,SIGNAL("clicked()"),self.func_buttonMul)
QObject.connect(button_dev,SIGNAL("clicked()"),self.func_buttonChu)
QObject.connect(button_eq,SIGNAL("clicked()"),self.func_buttonEqual)
QObject.connect(button_clear,SIGNAL("clicked()"),self.func_buttonClear)
def closeEvent(self,event):#窗口关闭时的处理，只实现这个函数就可以，不用去调用
reply = QMessageBox.question(self,'Message',"Are you sure to quit?",QMessageBox.Yes,QMessageBox.No)
if reply == QMessageBox.Yes:
event.accept()
else:
event.ignore()
def func_button7(self):
if self.flag == '1':
self.str2 = self.str2 + '7'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '7'
lcd.setText(self.str1)
def func_button8(self):
if self.flag == '1':
self.str2 = self.str2 + '8'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '8'
lcd.setText(self.str1)
def func_button9(self):
if self.flag == '1':
self.str2 = self.str2 + '9'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '9'
lcd.setText(self.str1)
def func_button4(self):
if self.flag == '1':
self.str2 = self.str2 + '4'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '4'
lcd.setText(self.str1)
def func_button5(self):
if self.flag == '1':
self.str2 = self.str2 + '5'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '5'
lcd.setText(self.str1)
def func_button6(self):
if self.flag == '1':
self.str2 = self.str2 + '6'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '6'
lcd.setText(self.str1)
def func_button1(self):
if self.flag == '1':
self.str2 = self.str2 + '1'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '1'
lcd.setText(self.str1)
def func_button2(self):
if self.flag == '1':
self.str2 = self.str2 + '2'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '2'
lcd.setText(self.str1)
def func_button3(self):
if self.flag == '1':
self.str2 = self.str2 + '3'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '3'
lcd.setText(self.str1)
def func_button0(self):
if self.flag == '1':
self.str2 = self.str2 + '0'
lcd.setText(self.str2)
else:
self.str1 = self.str1 + '0'
lcd.setText(self.str1)
#运算符处理函数
def func_buttonAdd(self):
lcd.setText(self.str2)
self.flag = '1'
self.calFlag = '1'
def func_buttonDec(self):
lcd.setText(self.str2)
self.flag = '1'
self.calFlag = '2'
def func_buttonMul(self):
lcd.setText(self.str2)
self.flag = '1'
self.calFlag = '3'
def func_buttonChu(self):
lcd.setText(self.str2)
self.flag = '1'
self.calFlag = '4'
def func_buttonEqual(self):
#字符串先转换为数字，计算结果后再转换为字符串
if self.calFlag == '1':
num = str(int(self.str1) + int(self.str2))
elif self.calFlag == '2':
num = str(int(self.str1) - int(self.str2))
elif self.calFlag == '3':
num = str(int(self.str1) * int(self.str2))
elif self.calFlag == '4':
num = str(int(self.str1) / int(self.str2))
else:
self.calFlag = '0'
lcd.setText(num)
def func_buttonClear(self):
self.str1 = ''
self.str2 = ''
lcd.setText('')
self.flag = '0'
if __name__ == "__main__":
app = QApplication(sys.argv)
myapp = UI_form()
myapp.show()
sys.exit(app.exec_())
运行结果如图：
三.总结
1.很多代码都是参考网上资料，debug花了不少时间，最初是想把UI和逻辑分开，import进来，但是总是不对，明天开学，时间紧，索性放一起了，有时间再更新。
2.只实现了简单的四则运算而且是二元的，可以仔细雕琢，增强功能。
欢迎朋友们挑毛病，提意见~
参考资料：
hqwfreefly 译《PyQt入门指南PDF中文版》
Python +PyQT实现简单的计算器点击打开链接
PyQt实现简单的计算器.点击打开链接