PyQt Can't pass correct parameters by button.clicked

[howxy]

    for n in range(0, 6):
        getattr(self, 'Button_input%s' % n).pressed.connect(lambda v=n: self.KvalueChanged(v))
    def KvalueChanged(self,v):
        print(v)

using pressed can return correct int v

    for n in range(0, 6):
        getattr(self, 'Button_input%s' % n).clicked.connect(lambda v=n: self.KvalueChanged(v))
    def KvalueChanged(self,v):
        print(v)

using clicked return bool v

[ChrisW67]

I can only assume that the for loop is in the class constructor for the class containing Kvaluechanged. This code on its own will not generate output. How you are triggering the buttons is not evident. If you post a complete program demonstrating the problem then it is more likely that someone will respond.

BTW: it seems that you are trying to implement something that QSignalMapper already exists for.

[howxy]

the complete program:
ui.py

from PySide2.QtCore import *
from PySide2.QtGui import *
from PySide2.QtWidgets import *


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        if not MainWindow.objectName():
            MainWindow.setObjectName(u"MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(u"centralwidget")
        self.layoutWidget_5 = QWidget(self.centralwidget)
        self.layoutWidget_5.setObjectName(u"layoutWidget_5")
        self.layoutWidget_5.setGeometry(QRect(330, 140, 258, 71))
        self.verticalLayout_5 = QVBoxLayout(self.layoutWidget_5)
        self.verticalLayout_5.setObjectName(u"verticalLayout_5")
        self.verticalLayout_5.setContentsMargins(0, 0, 0, 0)
        self.lineEdit_k3 = QLineEdit(self.layoutWidget_5)
        self.lineEdit_k3.setObjectName(u"lineEdit_k3")

        self.verticalLayout_5.addWidget(self.lineEdit_k3)

        self.Button_input3 = QPushButton(self.layoutWidget_5)
        self.Button_input3.setObjectName(u"Button_input3")

        self.verticalLayout_5.addWidget(self.Button_input3)

        self.layoutWidget_3 = QWidget(self.centralwidget)
        self.layoutWidget_3.setObjectName(u"layoutWidget_3")
        self.layoutWidget_3.setGeometry(QRect(40, 250, 258, 71))
        self.verticalLayout_3 = QVBoxLayout(self.layoutWidget_3)
        self.verticalLayout_3.setObjectName(u"verticalLayout_3")
        self.verticalLayout_3.setContentsMargins(0, 0, 0, 0)
        self.lineEdit_k4 = QLineEdit(self.layoutWidget_3)
        self.lineEdit_k4.setObjectName(u"lineEdit_k4")

        self.verticalLayout_3.addWidget(self.lineEdit_k4)

        self.Button_input4 = QPushButton(self.layoutWidget_3)
        self.Button_input4.setObjectName(u"Button_input4")

        self.verticalLayout_3.addWidget(self.Button_input4)

        self.layoutWidget_4 = QWidget(self.centralwidget)
        self.layoutWidget_4.setObjectName(u"layoutWidget_4")
        self.layoutWidget_4.setGeometry(QRect(330, 250, 258, 71))
        self.verticalLayout_4 = QVBoxLayout(self.layoutWidget_4)
        self.verticalLayout_4.setObjectName(u"verticalLayout_4")
        self.verticalLayout_4.setContentsMargins(0, 0, 0, 0)
        self.lineEdit_k5 = QLineEdit(self.layoutWidget_4)
        self.lineEdit_k5.setObjectName(u"lineEdit_k5")

        self.verticalLayout_4.addWidget(self.lineEdit_k5)

        self.Button_input5 = QPushButton(self.layoutWidget_4)
        self.Button_input5.setObjectName(u"Button_input5")

        self.verticalLayout_4.addWidget(self.Button_input5)

        self.layoutWidget = QWidget(self.centralwidget)
        self.layoutWidget.setObjectName(u"layoutWidget")
        self.layoutWidget.setGeometry(QRect(330, 30, 258, 71))
        self.verticalLayout = QVBoxLayout(self.layoutWidget)
        self.verticalLayout.setObjectName(u"verticalLayout")
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.lineEdit_k1 = QLineEdit(self.layoutWidget)
        self.lineEdit_k1.setObjectName(u"lineEdit_k1")

        self.verticalLayout.addWidget(self.lineEdit_k1)

        self.Button_input1 = QPushButton(self.layoutWidget)
        self.Button_input1.setObjectName(u"Button_input1")

        self.verticalLayout.addWidget(self.Button_input1)

        self.layoutWidget_2 = QWidget(self.centralwidget)
        self.layoutWidget_2.setObjectName(u"layoutWidget_2")
        self.layoutWidget_2.setGeometry(QRect(40, 140, 258, 71))
        self.verticalLayout_2 = QVBoxLayout(self.layoutWidget_2)
        self.verticalLayout_2.setObjectName(u"verticalLayout_2")
        self.verticalLayout_2.setContentsMargins(0, 0, 0, 0)
        self.lineEdit_k2 = QLineEdit(self.layoutWidget_2)
        self.lineEdit_k2.setObjectName(u"lineEdit_k2")

        self.verticalLayout_2.addWidget(self.lineEdit_k2)

        self.Button_input2 = QPushButton(self.layoutWidget_2)
        self.Button_input2.setObjectName(u"Button_input2")

        self.verticalLayout_2.addWidget(self.Button_input2)

        self.layoutWidget_6 = QWidget(self.centralwidget)
        self.layoutWidget_6.setObjectName(u"layoutWidget_6")
        self.layoutWidget_6.setGeometry(QRect(30, 30, 258, 71))
        self.verticalLayout_6 = QVBoxLayout(self.layoutWidget_6)
        self.verticalLayout_6.setObjectName(u"verticalLayout_6")
        self.verticalLayout_6.setContentsMargins(0, 0, 0, 0)
        self.lineEdit_k0 = QLineEdit(self.layoutWidget_6)
        self.lineEdit_k0.setObjectName(u"lineEdit_k0")

        self.verticalLayout_6.addWidget(self.lineEdit_k0)

        self.Button_input0 = QPushButton(self.layoutWidget_6)
        self.Button_input0.setObjectName(u"Button_input0")

        self.verticalLayout_6.addWidget(self.Button_input0)

        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QMenuBar(MainWindow)
        self.menubar.setObjectName(u"menubar")
        self.menubar.setGeometry(QRect(0, 0, 800, 23))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QStatusBar(MainWindow)
        self.statusbar.setObjectName(u"statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)

        QMetaObject.connectSlotsByName(MainWindow)
    # setupUi

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None))
        self.Button_input3.setText(QCoreApplication.translate("MainWindow", u"Button_input3", None))
        self.Button_input4.setText(QCoreApplication.translate("MainWindow", u"Button_input4", None))
        self.Button_input5.setText(QCoreApplication.translate("MainWindow", u"Button_input5", None))
        self.Button_input1.setText(QCoreApplication.translate("MainWindow", u"Button_input1", None))
        self.Button_input2.setText(QCoreApplication.translate("MainWindow", u"Button_input2", None))
        self.Button_input0.setText(QCoreApplication.translate("MainWindow", u"Button_input0", None))
    # retranslateUi

main.py(import is not included)

class myMainWindow(Ui_MainWindow, QMainWindow):
    def __init__(self):
        super(Ui_MainWindow, self).__init__()
        self.setupUi(self)
        for n in range(0, 6):
            getattr(self, 'Button_input%s' % n).pressed.connect(lambda v=n: self.KvalueChanged(v))


    def KvalueChanged(self,v):
        print(v)
        getattr(self, 'lineEdit_k%s' % v).setText(str(v))


if __name__ == '__main__':
    app = QApplication(sys.argv) 
    vieo_gui = myMainWindow()
    vieo_gui.show()
    sys.exit(app.exec_())

the correct result is

while 'pressed' changed 'clicked'

class myMainWindow(Ui_MainWindow, QMainWindow):
    def __init__(self):
        super(Ui_MainWindow, self).__init__()
        self.setupUi(self)
        for n in range(0, 6):
            getattr(self, 'Button_input%s' % n).clicked.connect(lambda v=n: self.KvalueChanged(v))


    def KvalueChanged(self,v):
        print(v)
        getattr(self, 'lineEdit_k%s' % v).setText(str(v))


if __name__ == '__main__':
    app = QApplication(sys.argv) 
    vieo_gui = myMainWindow()
    vieo_gui.show()
    sys.exit(app.exec_())

the result is wrong when button is clicked

error message :
Traceback (most recent call last):
File "D:\python_project\hohww\object-fall-detect\PythonApplication3\module3.py", line 29, in <lambda>
getattr(self, 'Button_input%s' % n).clicked.connect(lambda v=n: self.KvalueChanged(v))
File "D:\python_project\hohww\object-fall-detect\PythonApplication3\module3.py", line 34, in KvalueChanged
getattr(self, 'lineEdit_k%s' % v).setText(str(v))
AttributeError: 'myMainWindow' object has no attribute 'lineEdit_kFalse'

why the v is changed from int to False

[JonB]

@howxy said in PyQt Can't pass correct parameters by button.clicked:

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

This works because QPushButton.pressed() signal does not take any parameter.

getattr(self, 'Button_input%s' % n).clicked.connect(lambda v=n: self.KvalueChanged(v))

This does not work because QPushButton.clicked(bool checked = False) signal does take a parameter --- the checked state. From Python you need

btn.clicked.connect(lambda checked, v=n: self.KvalueChanged(v))

Something like that --- the lambda must be shown to accept the checked argument, any arguments you add must come after proper specification of the arguments actually passed by the signal. Your way the v=n argument was actually accepting the checked argument, hence showing as False.

I have not looked at your "complete program" post.

[howxy]

@JonB Thank you ! I get it.