无法从 Python 中的其他类获取值

Question

我尝试在其他类的 Window1 中使用 txtbox 中的值 通过单击 Window1 中的按钮 我尝试了 100 多种方法，但仍然不行！ 当我单击按钮时，如何在 Window1 中获取 txtbox 的值 运行 callstock 并首先在 callstock 中从 Window1 获取文本框的值 注意：当我设置值“示例”时，代码工作正常 但我无法从 Window1 类中获得该值

class Window1(QWidget):
    def __init__(self):
        super().__init__()
        self.setGeometry(550,200,500,500)
        self.setWindowTitle('program')
        self.UI()

    def UI(self):
        self.txtbox = QLineEdit(self)
        self.txtbox.move(150,10)
        self.txtbox.setPlaceholderText("name")
        btnfind = QPushButton("Find",self)
        btnfind.move(175,35)
        btnfind.clicked.connect(self.getValues)
        self.show()
    def sendval(self):
        txt = self.txtbox.text()
        return txt
    def getValues(self):
        self.newB = callstock()

class callstock(QWidget):
    def __init__(self):
        super().__init__()
        wi = Window1.sendval(self)
        self.setWindowTitle(wi)
        self.setGeometry(10,10,500,500)
        self.UI()
        self.figview1 = showchart1(name=wi,day=200)
        self.figview1.setGeometry(10,10,500,500)
        self.figview1.move(0,0)
        self.figview1.show()
    def UI(self):
        pass

def main():
    app = QApplication(sys.argv)
    window = Window1()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

Answer 1

您必须将第一类的实例作为参数发送到第二类 - 在您的代码中它将是 self，这意味着 Window1 的实例

   self.newB = callstock(self)

二等舱必须得到它 - 即。如other_class

class callstock(QWidget):
    
    def __init__(self, other_class):    # <-- get instance in `other_class`
        super().__init__()
        
        wi = other_class.txtbox.text()  # <-- use it 

---

最少的工作代码：

from PyQt5.Qt import *

class Window1(QWidget):
    
    def __init__(self):
        super().__init__()
        self.setGeometry(550, 200, 500, 500)  # PEP8: space after comma
        self.setWindowTitle('program')
        self.UI()

    def UI(self):
        self.txtbox = QLineEdit(self)
        self.txtbox.move(150, 10)  # PEP8: space after comma
        self.txtbox.setPlaceholderText("name")
        
        btnfind = QPushButton(self, text="Find")  # PEP8: space after comma
        btnfind.move(175, 35)  # PEP8: space after comma
        btnfind.clicked.connect(self.getValues)
        
        self.show()

    def getValues(self):
        self.newB = CallStock(self)  # <-- send instance of `Window1` as argument


class CallStock(QWidget):  # PEP8: `CamelCaseName` for classes
    
    def __init__(self, other_class):    # <-- get instance in variable `other_class`
        super().__init__()
        
        wi = other_class.txtbox.text()  # <-- use it
        
        self.setWindowTitle(wi)
        self.setGeometry(10, 10, 500, 500)  # PEP8: space after comma
        self.UI()

        self.figview1 = QLabel(self, text="Text from Window1: " + wi)
        #self.figview1 = showchart1(name=wi, day=200)  # PEP8: space after comma
        self.figview1.setGeometry(10, 10, 500, 500)  # PEP8: space after comma
        self.figview1.move(0, 0)  # PEP8: space after comma
        self.figview1.show()
        
        self.show()
        
    def UI(self):
        pass

def main():
    app = QApplication([])
    window = Window1()
    app.exec()

if __name__ == '__main__':
    main()

---

PEP 8 -- Style Guide for Python Code

---

编辑：

你也可以只发送文本而不是完整的实例

    self.newB = CallStock(self.txtbox.text())

和

class CallStock(QWidget):  # PEP8: `CamelCaseName` for classes
    
    def __init__(self, wi):  # <-- get text in variable `wi`

最少的工作代码：

from PyQt5.Qt import *

class Window1(QWidget):
    
    def __init__(self):
        super().__init__()
        self.setGeometry(550, 200, 500, 500)  # PEP8: space after comma
        self.setWindowTitle('program')
        self.UI()

    def UI(self):
        self.txtbox = QLineEdit(self)
        self.txtbox.move(150, 10)  # PEP8: space after comma
        self.txtbox.setPlaceholderText("name")
        
        btnfind = QPushButton(self, text="Find")  # PEP8: space after comma
        btnfind.move(175, 35)  # PEP8: space after comma
        btnfind.clicked.connect(self.getValues)
        
        self.show()

    def getValues(self):
        self.newB = CallStock(self.txtbox.text())


class CallStock(QWidget):  # PEP8: `CamelCaseName` for classes
    
    def __init__(self, wi):
        super().__init__()
        
        self.setWindowTitle(wi)
        self.setGeometry(10, 10, 500, 500)  # PEP8: space after comma
        self.UI()

        self.figview1 = QLabel(self, text="Text from Window1: " + wi)
        #self.figview1 = showchart1(name=wi, day=200)  # PEP8: space after comma
        self.figview1.setGeometry(10, 10, 500, 500)  # PEP8: space after comma
        self.figview1.move(0, 0)  # PEP8: space after comma
        self.figview1.show()
        
        self.show()
        
    def UI(self):
        pass

def main():
    app = QApplication([])
    window = Window1()
    app.exec()

if __name__ == '__main__':
    main()