https://www.reddit.com/r/learnpython/comments/aqcsxm/qtextedit_object_treated_as_bool/

npc.py

#! /usr/bin/python3
from PyQt5.QtWidgets import (QHBoxLayout, QVBoxLayout,
                             QComboBox, QCheckBox, QLabel,
                             QPushButton, QTextEdit, QScrollArea,)

from ..math import charactergen

class Tab:

    def __init__(self):
        self.tab()

    def tab(self):
        # Initializing the complete layout
        self.layout = QVBoxLayout()

        # The list of species to choose from. Change the values in the listOfSpecies
        # list to get different results on the page.
        speciesComboBoxLabel = QLabel()
        speciesComboBoxLabel.setText("Species:")
        speciesComboBox = QComboBox()
        listOfSpecies = ('Dragonborn', 'Dwarf', 'Eldarin', 'Elf',
                        'Halfling', 'Human', 'Tiefling', 'Goblin',
                        'Slime', 'Random Appropriate Monster')
        speciesComboBox.addItems(listOfSpecies)

        # This sets up the level scaling for the resulting character. The current
        # cap is at 30, but the algorithm should continue to function to any level.
        levelComboBoxLabel = QLabel()
        levelComboBoxLabel.setText("Level:")
        levelComboBox = QComboBox()
        for i in range(1, 31):
            levelComboBox.addItem(str(i))
            i += 1

        # This sets up the list of classes. Only four basic classes are here now,
        # but to add more, add a comma after the last item and write in whatever you
        # want, as long as it's in single quotes
        classesComboBoxLabel = QLabel()
        classesComboBoxLabel.setText("Class:")
        classesComboBox = QComboBox()
        listOfClasses = ('Fighter', 'Ranger', 'Rogue', 'Mage', 'Cleric')
        classesComboBox.addItems(listOfClasses)

        # This sets up the elements box
        elementsComboBoxLabel = QLabel()
        elementsComboBoxLabel.setText("Element:")
        elementsComboBox = QComboBox()
        listOfElements = ('Air', 'Earth', 'Water', 'Fire', 'Forest')
        elementsComboBox.addItems(listOfElements)

        # This is a toggle modifier to increase the strength of the monster and the
        # loot it's carrying. It's entirely optional and can be removed, or the
        # strength of the modifier can be changed in the "math" folder.
        bossCheckBoxLabel = QLabel()
        bossCheckBoxLabel.setText("Boss:")
        bossCheckBox = QCheckBox()

        # These are the buttons for saving and generating new NPCs.

        self.generateButton = QPushButton("Generate")
        self.generateButton.clicked.connect(self.GenerateButtonPressed)
        saveButton = QPushButton("Save")

        bottomButtonsLayout = QHBoxLayout()
        bottomButtonsLayout.addStretch(1)
        bottomButtonsLayout.addWidget(self.generateButton)
        bottomButtonsLayout.addWidget(saveButton)

        # This builds the textbox that you see the resulting character in

        self.mainTextBox = QTextEdit()
        self.mainTextBox.setPlainText('asdf')
    # mainTextBox.moveCursor(QTextCursor.Start)
        textBoxLayout = QHBoxLayout()
        textBoxLayout.addWidget(self.mainTextBox)

        # This creates the layout for the controls. Any new fields should
        # follow this same general convention.
        controls = QScrollArea()
        controls.setFixedHeight(100)
        controls.setWidgetResizable(False)
        controlsLayout = QHBoxLayout(controls)

        controls.setWidget(controlsLayout.widget())

        controlsLayout.addWidget(levelComboBoxLabel)
        controlsLayout.addWidget(levelComboBox)
        controlsLayout.addWidget(speciesComboBoxLabel)
        controlsLayout.addWidget(speciesComboBox)
        controlsLayout.addWidget(classesComboBoxLabel)
        controlsLayout.addWidget(classesComboBox)
        controlsLayout.addWidget(elementsComboBoxLabel)
        controlsLayout.addWidget(elementsComboBox)
        controlsLayout.addWidget(bossCheckBoxLabel)
        controlsLayout.addWidget(bossCheckBox)

        # Adds all of the disparate groups of controls to the total layout
        self.layout.addWidget(controls)
        self.layout.addLayout(textBoxLayout)
        self.layout.addLayout(bottomButtonsLayout)

    def GenerateButtonPressed(self):
        print("Party")
        self.mainTextBox.setPlainText('cdhcihfif')