How to get imported class to change attribute of main.py label stylesheet [closed] - python-3.x

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I am using PyQt5 to create a gui, defining a buttons class in a separate .py file and importing it, then trying to use a method from my buttons class to change the color of a label in my Ui_MainWindow which is my gui class in main.py
I have isolated this code from a larger project which outlines what I am attempting to accomplish.
Here is my buttons class which is saved and imported as buttons:
class buttons(object):
def __init__(self, Ui_MainWindow):
print('creating buttons object')
def func(self):
Ui_MainWindow.label.setStyleSheet("background-color: green;")
Here is my main.py with my Ui_MainWindow class which constructs the gui:
from PyQt5 import QtCore, QtGui, QtWidgets
import buttons
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(311, 228)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
# Push button created
self.pushButton = QtWidgets.QPushButton(self.centralwidget, clicked = lambda: (btn_obj.func()))
self.pushButton.setGeometry(QtCore.QRect(0, 70, 131, 81))
self.pushButton.setObjectName("pushButton")
self.label = QtWidgets.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(180, 50, 121, 101))
self.label.setStyleSheet("background-color: rgb(255, 0, 4);")
self.label.setText("")
self.label.setObjectName("label")
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 311, 21))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
# CREATE A BUTTONS OBJECT SO WE CAN CALL ITS METHOD
btn_obj = buttons.buttons(self)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.pushButton.setText(_translate("MainWindow", "PushButton"))
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
This is throwing the error:
Traceback (most recent call last):
File "c:\Users\Gaming\Google Drive\Code\Python\help\main.py", line 13, in <lambda>
self.pushButton = QtWidgets.QPushButton(self.centralwidget, clicked = lambda: (btn_obj.func()))
File "c:\Users\Gaming\Google Drive\Code\Python\help\buttons.py", line 6, in func
Ui_MainWindow.label.setStyleSheet("background-color: green;")
NameError: name 'Ui_MainWindow' is not defined
If I understand correctly, since the label in question is an attribute of a Ui_MainWindow object, and not the class itself it is unable to be changed with my current code. I am hoping someone could show/tell me the proper way to implement this sort of thing. Thank you in advance.

Answer 1

Change:
class buttons(object):
def __init__(self, Ui_MainWindow):
print('creating buttons object')
def func(self):
Ui_MainWindow.label.setStyleSheet("background-color: green;")
To:
class buttons(object):
def __init__(self, Ui_MainWindow):
print('creating buttons object')
self.Ui_MainWindow = Ui_MainWindow
def func(self):
self.Ui_MainWindow.label.setStyleSheet("background-color: green;")