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！