PyQt5 简易计算器

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剩下计算函数(self.calculator)未实现，有兴趣的朋友可以实现它

【知识点】

1、利用循环添加按钮部件，及给每个按钮设置信号/槽

2、给按钮设置固定大小：button.setFixedSize(QtCore.QSize(60,30))

3、取事件的的发送者（此例为各个按钮）的文本： self.sender().text()

【效果图】

【源代码】

import sys
from PyQt5 import QtWidgets,QtCore,QtGui class Example(QtWidgets.QWidget): def __init__(self):
super(Example, self).__init__()
self.initUI() self.reset() def initUI(self):
self.setWindowTitle('简易计算器')
grid = QtWidgets.QGridLayout() self.display = QtWidgets.QLineEdit('')
self.display.setFont(QtGui.QFont("Times", 20))
self.display.setReadOnly(True)
self.display.setAlignment(QtCore.Qt.AlignRight)
self.display.setMaxLength(15)
grid.addWidget(self.display,0,0,1,4) names = ['Clear', 'Back', '', 'Close',
'', '', '', '/',
'', '', '', '*',
'', '', '', '-',
'', '.', '=', '+']
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(60,30))
button.clicked.connect(self.buttonClicked) # 给每个按钮设置信号/槽
if c == 2:
pass
#grid.addWidget(QtWidgets.QLabel(''), 0, 2) #替换第三个按钮为文本标签！
else:
grid.addWidget(button, pos[c][0]+1, pos[c][1])
c = c + 1 self.setLayout(grid) def buttonClicked(self):
#sender = self.sender(); # 确定信号发送者
#self.display.setText(sender.text())
text = self.sender().text()
if text in '+-*/':
self.history.append(self.number) # 数字入栈
self.history.append(text) # 运算符入栈
self.operator = text # 设置当前运算符
self.number = "" # 数字清空
self.numberType = "int"
return
elif text == "=":
self.calculate() # 计算
elif text == "Back":
pass
elif text == "Clear":
self.reset()
elif text == "Close":
self.close()
elif text == ".":
if self.numberType == "int":
self.number += text
self.numberType = "float"
else:
self.number = self.number + text if self.number != "" else text self.display.setText(self.number) def calculate(self):
pass def reset(self):
self.number = ""
self.result = 0
self.history = []
self.operator = '' # +,-,*,/
self.numberType = 'int' # int与float两种，如果输入了小数点则为实数 app = QtWidgets.QApplication(sys.argv)
ex = Example()
ex.show()
sys.exit(app.exec_())