1 ui设计

使用

qt designer

，按装anaconda后，在如下路径找到：

conda3.05\Library\bin

designer.exe

文件，双击启动：

image

创建窗体，命名为

XiaoDing

，整个的界面如下所示：

image

qt 设计器

提供的常用控件基本都能满足开发需求，通过拖动左侧的控件，很便捷的就能搭建出如下的UI界面，比传统的手写控件代码要方便很多。

最终设计的计算器

XiaoDing

界面如下，

image

比如，其中一个用于计算器显示的对象：

lcdNumber

，对象的类型为：

LCD Number

。右侧为计算器中用到的所有对象。

image image

2 转py文件

使用如下命令，将设计好的

ui

文件转为

py

文件

pyuic5 -o ./calculator/MainWindow.py ./calculator/mainwindow.ui

3 计算器实现逻辑

导入库：

from PyQt5.QtGui import *

from PyQt5.QtWidgets import *

from PyQt5.QtCore import *

import operator

from MainWindow import Ui_MainWindow

主题代码逻辑很精简：

Calculator state.

READY = 0

INPUT = 1

class MainWindow(QMainWindow, Ui_MainWindow):

def init(self, *args, **kwargs):

super(MainWindow, self).init(*args, **kwargs)

self.setupUi(self)

Setup numbers.

for n in range(0, 10):

getattr(self, 'pushButton_n%s' % n).pressed.connect(lambda v=n: self.input_number(v))

Setup operations.

self.pushButton_add.pressed.connect(lambda: self.operation(operator.add))

self.pushButton_sub.pressed.connect(lambda: self.operation(operator.sub))

self.pushButton_mul.pressed.connect(lambda: self.operation(operator.mul))

self.pushButton_div.pressed.connect(lambda: self.operation(operator.truediv)) # operator.div for Python2.7

self.pushButton_pc.pressed.connect(self.operation_pc)

self.pushButton_eq.pressed.connect(self.equals)

Setup actions

self.actionReset.triggered.connect(self.reset)

self.pushButton_ac.pressed.connect(self.reset)

self.actionExit.triggered.connect(self.close)

self.pushButton_m.pressed.connect(self.memory_store)

self.pushButton_mr.pressed.connect(self.memory_recall)

self.memory = 0

self.reset()

self.show()

基础方法：

def input_number(self, v):

if self.state == READY:

self.state = INPUT

self.stack[-1] = v

else:

self.stack[-1] = self.stack[-1] * 10 + v

self.display()

def display(self):

self.lcdNumber.display(self.stack[-1])

按钮

RE

,

M

,

RE

对应的实现逻辑：

def reset(self):

self.state = READY

self.stack = [0]

self.last_operation = None

self.current_op = None

self.display()

def memory_store(self):

self.memory = self.lcdNumber.value()

def memory_recall(self):

self.state = INPUT

self.stack[-1] = self.memory

self.display()

,

,

x

,

/

,

/100

对应实现方法：

def operation(self, op):

if self.current_op: # Complete the current operation

self.equals()

self.stack.append(0)

self.state = INPUT

self.current_op = op

def operation_pc(self):

self.state = INPUT

self.stack[-1] *= 0.01

self.display()

=

号对应的方法实现：

def equals(self):

if self.state == READY and self.last_operation:

s, self.current_op = self.last_operation

self.stack.append(s)

if self.current_op:

self.last_operation = self.stack[-1], self.current_op

try:

self.stack = [self.current_op(*self.stack)]

except Exception:

self.lcdNumber.display('Err')

self.stack = [0]

else:

self.current_op = None

self.state = READY

self.display()

main函数：

if name == 'main':

app = QApplication([])

app.setApplicationName("XiaoDing")

window = MainWindow()

app.exec_()

image

include

int main()

printf("学习从来不是一个人的事情，要有个相互监督的伙伴\n");

printf("工作需要学习Python或者为了入行、转行学习Python的伙伴\n");

printf("可以家裙:457012314，领取100G学习资料\n");

return 0;