self.pushButton_3.clicked.connect(self.exit)
时间: 2023-12-24 14:04:42 浏览: 25
这也是一个PyQt5中信号与槽机制的用法,`self.pushButton_3`表示主窗口中的另一个按钮控件,`.clicked`表示按钮控件被单击时触发的信号,`.connect`表示将该信号与一个槽函数进行连接,`self.exit`表示一个槽函数,它会在按钮被单击时自动执行。简而言之,这一行代码的作用是将主窗口中的另一个按钮信号与一个槽函数进行连接,当用户单击该按钮时,会自动执行`self.exit`函数。这个函数通常会用来实现退出程序的相关逻辑,例如关闭程序窗口、保存用户数据、释放资源等。需要根据具体的需求和业务逻辑来实现该函数。
相关问题
import sys from PyQt5.QtWidgets import QApplication, QWidget , QMainWindow from Calui1 import Ui_Form class Mywindow(QWidget,Ui_Form): def __init__(self): super(Mywindow,self).__init__() self.setupUi(self) def btnClear_clicked(self): self.lineEdit.clear() def btn1(self): self.lineEdit.insert("1") def btn2(self): self.lineEdit.insert("2") def btn3(self): self.lineEdit.insert("3") def btn4(self): self.lineEdit.insert("4") def btn5(self): self.lineEdit.insert("5") def btn6(self): self.lineEdit.insert("6") def btn7(self): self.lineEdit.insert("7") def btn8(self): self.lineEdit.insert("8") def btn9(self): self.lineEdit.insert("9") def btn0(self): self.lineEdit.insert("0") def btn_plus(self): self.lineEdit.insert("+") def btn_sub(self): self.lineEdit.insert("-") def btn_mul(self): self.lineEdit.insert("*") def btn_div(self): self.lineEdit.insert("/") def btnequal(self): text=self.lineEdit.text() self.lineEdit.insert("= %.2f" %(eval(text))) if __name__=='__main__': app=QApplication(sys.argv) win=Mywindow() win.pushButton_7.clicked.connect(win.btnClear_clicked()) win.pushButton.clicked.connect(win.btn1()) win.pushButton_2.clicked.connect(win.btn2()) win.pushButton_3.clicked.connect(win.btn3()) win.pushButton_4.clicked.connect(win.btn_plus()) win.pushButton_5.clicked.connect(win.btn4()) win.pushButton_6.clicked.connect(win.btn7()) win.pushButton_8.clicked.connect(win.btn5()) win.pushButton_9.clicked.connect(win.btn8()) win.pushButton_10.clicked.connect(win.btn0()) win.pushButton_11.clicked.connect(win.btn6()) win.pushButton_12.clicked.connect(win.btn9()) win.pushButton_13.clicked.connect(win.btnequal()) win.pushButton_14.clicked.connect(win.btn_sub()) win.pushButton_15.clicked.connect(win.btn_mul()) win.pushButton_16.clicked.connect(win.btn_div()) win.show() sys.exit(app.exec_())错在哪
你忘记了在导入模块时使用逗号分隔,应该改为:
```python
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow
from Calui1 import Ui_Form
class Mywindow(QWidget,Ui_Form):
def __init__(self):
super(Mywindow,self).__init__()
self.setupUi(self)
def btnClear_clicked(self):
self.lineEdit.clear()
def btn1(self):
self.lineEdit.insert("1")
def btn2(self):
self.lineEdit.insert("2")
def btn3(self):
self.lineEdit.insert("3")
def btn4(self):
self.lineEdit.insert("4")
def btn5(self):
self.lineEdit.insert("5")
def btn6(self):
self.lineEdit.insert("6")
def btn7(self):
self.lineEdit.insert("7")
def btn8(self):
self.lineEdit.insert("8")
def btn9(self):
self.lineEdit.insert("9")
def btn0(self):
self.lineEdit.insert("0")
def btn_plus(self):
self.lineEdit.insert("+")
def btn_sub(self):
self.lineEdit.insert("-")
def btn_mul(self):
self.lineEdit.insert("*")
def btn_div(self):
self.lineEdit.insert("/")
def btnequal(self):
text=self.lineEdit.text()
self.lineEdit.insert("= %.2f" %(eval(text)))
if __name__=='__main__':
app=QApplication(sys.argv)
win=Mywindow()
win.pushButton_7.clicked.connect(win.btnClear_clicked)
win.pushButton.clicked.connect(win.btn1)
win.pushButton_2.clicked.connect(win.btn2)
win.pushButton_3.clicked.connect(win.btn3)
win.pushButton_4.clicked.connect(win.btn_plus)
win.pushButton_5.clicked.connect(win.btn4)
win.pushButton_6.clicked.connect(win.btn7)
win.pushButton_8.clicked.connect(win.btn5)
win.pushButton_9.clicked.connect(win.btn8)
win.pushButton_10.clicked.connect(win.btn0)
win.pushButton_11.clicked.connect(win.btn6)
win.pushButton_12.clicked.connect(win.btn9)
win.pushButton_13.clicked.connect(win.btnequal)
win.pushButton_14.clicked.connect(win.btn_sub)
win.pushButton_15.clicked.connect(win.btn_mul)
win.pushButton_16.clicked.connect(win.btn_div)
win.show()
sys.exit(app.exec_())
```
import sys from PyQt5.QtWidgets import QApplication, QWidget , QMainWindow from Calui1 import Ui_Form class Mywindow(QWidget,Ui_Form): def init(self): super(Mywindow,self).init() self.setupUi(self) def btnClear_clicked(self): self.lineEdit.clear() def btn1(self): self.lineEdit.insert("1") def btn2(self): self.lineEdit.insert("2") def btn3(self): self.lineEdit.insert("3") def btn4(self): self.lineEdit.insert("4") def btn5(self): self.lineEdit.insert("5") def btn6(self): self.lineEdit.insert("6") def btn7(self): self.lineEdit.insert("7") def btn8(self): self.lineEdit.insert("8") def btn9(self): self.lineEdit.insert("9") def btn0(self): self.lineEdit.insert("0") def btn_plus(self): self.lineEdit.insert("+") def btn_sub(self): self.lineEdit.insert("-") def btn_mul(self): self.lineEdit.insert("*") def btn_div(self): self.lineEdit.insert("/") def btnequal(self): text=self.lineEdit.text() self.lineEdit.insert("= %.2f" %(eval(text))) if name=='main': app=QApplication(sys.argv) win=Mywindow() win.pushButton_7.clicked.connect(win.btnClear_clicked()) win.pushButton.clicked.connect(win.btn1()) win.pushButton_2.clicked.connect(win.btn2()) win.pushButton_3.clicked.connect(win.btn3()) win.pushButton_4.clicked.connect(win.btn_plus()) win.pushButton_5.clicked.connect(win.btn4()) win.pushButton_6.clicked.connect(win.btn7()) win.pushButton_8.clicked.connect(win.btn5()) win.pushButton_9.clicked.connect(win.btn8()) win.pushButton_10.clicked.connect(win.btn0()) win.pushButton_11.clicked.connect(win.btn6()) win.pushButton_12.clicked.connect(win.btn9()) win.pushButton_13.clicked.connect(win.btnequal()) win.pushButton_14.clicked.connect(win.btn_sub()) win.pushButton_15.clicked.connect(win.btn_mul()) win.pushButton_16.clicked.connect(win.btn_div()) win.show() sys.exit(app.exec_())为什么会报错
这段代码有几个问题:
1. 在第一行导入语句中,`from PyQt5.QtWidgets import QApplication, QWidget , QMainWindow` 中间缺少逗号,应该为 `from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow`。
2. 在 `Mywindow` 类的构造函数中,`init` 方法应该为 `__init__`。
3. 在 `Mywindow` 类中,所有的按钮槽函数应该以 `on_` 开头,例如 `on_btnClear_clicked`。
4. 在 `btnequal` 方法中,如果用户输入了非法表达式,可能会引发 `ZeroDivisionError` 异常,建议添加异常处理代码。
修改后的代码如下:
```
import sys
from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow
from Calui1 import Ui_Form
class Mywindow(QWidget,Ui_Form):
def __init__(self):
super(Mywindow,self).__init__()
self.setupUi(self)
def on_btnClear_clicked(self):
self.lineEdit.clear()
def on_btn1_clicked(self):
self.lineEdit.insert("1")
def on_btn2_clicked(self):
self.lineEdit.insert("2")
def on_btn3_clicked(self):
self.lineEdit.insert("3")
def on_btn4_clicked(self):
self.lineEdit.insert("4")
def on_btn5_clicked(self):
self.lineEdit.insert("5")
def on_btn6_clicked(self):
self.lineEdit.insert("6")
def on_btn7_clicked(self):
self.lineEdit.insert("7")
def on_btn8_clicked(self):
self.lineEdit.insert("8")
def on_btn9_clicked(self):
self.lineEdit.insert("9")
def on_btn0_clicked(self):
self.lineEdit.insert("0")
def on_btn_plus_clicked(self):
self.lineEdit.insert("+")
def on_btn_sub_clicked(self):
self.lineEdit.insert("-")
def on_btn_mul_clicked(self):
self.lineEdit.insert("*")
def on_btn_div_clicked(self):
self.lineEdit.insert("/")
def on_btnequal_clicked(self):
try:
text = self.lineEdit.text()
result = eval(text)
self.lineEdit.setText("= %.2f" % result)
except ZeroDivisionError:
self.lineEdit.setText("除数不能为零")
except Exception as e:
self.lineEdit.setText(str(e))
if __name__=='__main__':
app = QApplication(sys.argv)
win = Mywindow()
win.pushButton_7.clicked.connect(win.on_btnClear_clicked)
win.pushButton.clicked.connect(win.on_btn1_clicked)
win.pushButton_2.clicked.connect(win.on_btn2_clicked)
win.pushButton_3.clicked.connect(win.on_btn3_clicked)
win.pushButton_4.clicked.connect(win.on_btn_plus_clicked)
win.pushButton_5.clicked.connect(win.on_btn4_clicked)
win.pushButton_6.clicked.connect(win.on_btn7_clicked)
win.pushButton_8.clicked.connect(win.on_btn5_clicked)
win.pushButton_9.clicked.connect(win.on_btn8_clicked)
win.pushButton_10.clicked.connect(win.on_btn0_clicked)
win.pushButton_11.clicked.connect(win.on_btn6_clicked)
win.pushButton_12.clicked.connect(win.on_btn9_clicked)
win.pushButton_13.clicked.connect(win.on_btnequal_clicked)
win.pushButton_14.clicked.connect(win.on_btn_sub_clicked)
win.pushButton_15.clicked.connect(win.on_btn_mul_clicked)
win.pushButton_16.clicked.connect(win.on_btn_div_clicked)
win.show()
sys.exit(app.exec_())
```
希望能帮到你!