Passing a python function as an arg to a function in PyQt5 - python-3.x

Question

Sorry for the long post but wished to give as much as poss
There is a lot of code not shown here but I'm trying to clean up a huge function of buttons in a PyQt5 Gui
I have a GUI output and all is working well and I'm now making an attempt to remove the repeated code and so creating a function to create the buttons.
In a functioned name initUI I have around 20 buttons. As can be seen from the code, the old way was creating each one separately.
What I have done is to create a function that the parameters are sent to and this then creates them.
This does work apart from defRun arg sent to button.
This is passing a call to another function I've highlighted with >>>>arg<<<< this isn't really in the code
class iac2tf(QMainWindow):
def __init__(self):
super(iac2tf, self).__init__()
self.initUI()
self.setGeometry(0, 0, 1700, 1000)........
def button (self, buttonName, buttonText, >>>>defRun<<<<, buttonWidth, buttonHeight, buttonx, buttony):
self.buttonName = QtWidgets.QPushButton(buttonText,self)
>>>>self.buttonName.clicked.connect(lambda:self.defRun)<<<<
self.buttonName.resize(buttonWidth,buttonHeight)
self.buttonName.move(buttonx,buttony)
self.buttonName.show()
def initUI(self):
#passed style
self.openFilebutton = self.button('openFile', 'Open File', >>>'open()'<<<< ,110,30,5,50)
#Old style
self.ProcessFile = QtWidgets.QPushButton('Process File',self)
self.ProcessFile.clicked.connect(self.processFile)
self.ProcessFile.resize(110,30)
self.ProcessFile.move(5, 80)
/......
....../
def open(self):
options = QFileDialog.Options()
options |= QFileDialog.DontUseNativeDialog
file, _ = QFileDialog.getOpenFileNames(self, 'Ope.......
app = QApplication(sys.argv)
win = iac2tf()
win.show()
I've tried passing Knowing some would fail but wanted to cover all bases and was exasperated
str(open)
GUI opens with
<built-in function open>
On clicking button
File "/home/bob/present/proj/WorksArea/gui.py", line 38, in <lambda>
self.buttonName.clicked.connect(lambda:self.defRun)
AttributeError: 'iac2tf' object has no attribute 'defRun'
str(open())
self.openFilebutton = self.button('openFile', 'Open File', str(open()) ,110,30,5,50)
TypeError: Required argument 'file' (pos 1) not found
str(self.open)
GUI opens with
<bound method iac2tf.open of <__main__.iac2tf object at 0x7f87e73da948>>
On clicking button
Traceback (most recent call last):
File "/home/bob/present/proj/WorksArea/gui.py", line 38, in <lambda>
self.buttonName.clicked.connect(lambda:self.defRun)
AttributeError: 'iac2tf' object has no attribute 'defRun'
str(self.open())
Open file selection menu ie starts open func
self.open
GUI starts
<bound method iac2tf.open of <__main__.iac2tf object at 0x7fdcb2dee948>>
On clicking button
Traceback (most recent call last):
File "/home/bob/present/proj/WorksArea/gui.py", line 38, in <lambda>
self.buttonName.clicked.connect(lambda:self.defRun)
AttributeError: 'iac2tf' object has no attribute 'defRun'
'self.open'
'self.open()'
'open()'
'open'
opens GUI without error
on clicking button
Traceback (most recent call last):
File "/home/bob/present/proj/WorksArea/gui.py", line 38, in <lambda>
self.buttonName.clicked.connect(lambda:self.defRun)
AttributeError: 'iac2tf' object has no attribute 'defRun'
open
opens GUI with
<built-in function open>
on clicking button
Traceback (most recent call last):
File "/home/bob/present/proj/WorksArea/gui.py", line 38, in <lambda>
self.buttonName.clicked.connect(lambda:self.defRun)
AttributeError: 'iac2tf' object has no attribute 'defRun'
open()
self.openFilebutton = self.button('openFile', 'Open File', open() ,110,30,5,50)
TypeError: Required argument 'file' (pos 1) not found
passing to a local to func var all of above but is as is :(

Answer 1

Here is an example of passing functions as arguments.
class Template(QWidget):
def __init__(self):
super().__init__()
self.vbox = QVBoxLayout(self)
self.create_button('Open', self.open)
self.create_button('Close', self.close)
def create_button(self, text, slot):
btn = QPushButton(text)
btn.clicked.connect(slot)
self.vbox.addWidget(btn)
def open(self):
QFileDialog.getOpenFileName(self)
Also worth noting that the arg buttonName is never actually used in this function:
def button (self, buttonName, buttonText, >>>>defRun<<<<, buttonWidth, buttonHeight, buttonx, buttony):
self.buttonName = QtWidgets.QPushButton(buttonText,self)
. . .
That variable only exists in the local scope of the function, and self.buttonName refers to another object entirely. That is to say, if you wanted to refer to a button you created where you passed 'openFile' for the buttonName arg, it would not be called self.openFile, it would be called literally self.buttonName. You could however, use exec() to achieve this, although it is generally discouraged.