How can I use function with 2 arguments includes 'self' in Python?-CodePudding

To solve the closed question, I post full code here.

import os
import sys
from PyQt5.QtWidgets import * 
from PyQt5 import uic

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
form_class = uic.loadUiType(BASE_DIR   "./test.ui")[0]

class WindowClass(QMainWindow, form_class):
    def __init__(self) :
        super().__init__()
        self.setupUi(self)

        self.button.clicked.connect(self.func)

    def func(self, a):
        global b
        b = a

    
if __name__ == "__main__" :
    app = QApplication(sys.argv) 
    myWindow = WindowClass() 
    myWindow.show()
    app.exec_()

and also it needs ui file in same directory,

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget  name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>298</width>
    <height>197</height>
   </rect>
  </property>
  <property name="maximumSize">
   <size>
    <width>298</width>
    <height>197</height>
   </size>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget  name="centralwidget">
   <widget  name="button">
    <property name="geometry">
     <rect>
      <x>100</x>
      <y>80</y>
      <width>75</width>
      <height>23</height>
     </rect>
    </property>
    <property name="text">
     <string>PushButton</string>
    </property>
   </widget>
  </widget>
  <widget  name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

In this code,

class WindowClass(QMainWindow, form_class):
    def __init__(self) :
        super().__init__()
        self.setupUi(self)

        self.button.clicked.connect(self.func(1))
    
    def func(self, a):
        global b
        b = a

This results in an argument error(TypeError: argument 1 has unexpected type 'NoneType'). Is there any way to use the function func?

I tried wc = WindowClass() and changed code into:

class WindowClass(QMainWindow, form_class):
    def __init__(self) :
        super().__init__()
        self.setupUi(self)
        wc = WindowClass()
        self.button.clicked.connect(wc.func(1))
    
    def func(self, a):
        global b
        b = a

This results in a fatal initializing error(Fatal Python error: _Py_CheckRecursiveCall: Cannot recover from stack overflow. Python runtime state: initialized Current thread 0x000097e8 (most recent call first):).

The code works perfect when it is:

class WindowClass(QMainWindow, form_class):
    def __init__(self) :
        super().__init__()
        self.setupUi(self)

        self.button.clicked.connect(self.func)
    
    def func(self):
        global b
        b = 1

However, I have to use func as 2 arguments. How can I do this?

CodePudding user response：

Try using partial:

from functools import partial

self.button.clicked.connect(partial(self.func, 1))

My guess is that connect expects a 0 argument function. Partial fixates the argument and creates a 0 argument function.