help needed running a simple function in pyqt5

[menator01]

import random as rnd

import sys
from PyQt5.QtWidgets import (QMainWindow, QApplication, QWidget, QPushButton, QGridLayout, QLabel,
QLineEdit, QListWidget, QListWidgetItem, QMessageBox)
from PyQt5.QtCore import Qt


class Window(QMainWindow):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Container
        container = QGridLayout()

        label = QLabel('How many numbers?')
        label2 = QLabel('How many spots?')

        self.entry = QLineEdit()
        self.entry.setPlaceholderText('How many numbers?')
        self.entry.setStyleSheet('border: 1px solid black;')

        self.entry2 = QLineEdit()
        self.entry2.setPlaceholderText('How many spots?')
        self.entry2.setStyleSheet('border: 1px solid black;')

        button = QPushButton('Submit')
        button.clicked.connect(lambda: self.picker(self.entry, self.entry2))
        button2 = QPushButton('Clear')
        button2.clicked.connect(self.clear)

        spinbtn = QPushButton('Spin')
        spinbtn.clicked.connect(lambda: self.odd_even())

        self.listbox = QListWidget()

        container.addWidget(label, 0, 0, 1, 1)
        container.addWidget(self.entry, 0, 1, 1, 1)
        container.addWidget(label2, 1, 0, 1, 1)
        container.addWidget(self.entry2, 1, 1, 1, 1)
        container.addWidget(button, 2, 0, 1, 1)
        container.addWidget(button2, 2, 1, 1, 1)
        container.addWidget(self.listbox, 3, 0, 1, 2)
        container.addWidget(spinbtn, 4, 0, 1, 2)

        widget = QWidget()
        widget.setLayout(container)
        self.setCentralWidget(widget)

    def odd_even(self):
        color = rnd.choice(('red', 'black'))
        item = QListWidgetItem(f"{rnd.choice(('odd', 'even'))} {color}")
        if color == 'red':
            item.setForeground(Qt.red)
        self.listbox.addItem(item)


    def clear(self):
        self.listbox.clear()

    def picker(self, how_many, spots):
        messages = ['Spot\'s can not be less than number', 'Only numbers can be entered']
        error = 0
        try:
            spots = int(spots.text())
            how_many = int(how_many.text())
            if spots < how_many:
                text = messages[0]
                error += 1
        except ValueError:
            error += 1
            text = messages[1]

        if error > 0:
            msg = QMessageBox()
            msg.setText(text)
            msg.setIcon(QMessageBox.Warning)
            msg.setWindowTitle('Warning Error!')
            msg.setStandardButtons(QMessageBox.Ok)
            msg.exec_()
        else:
            picks = []
            while len(picks) < how_many:
                pick = rnd.randint(1, spots)
                if str(pick) not in picks:
                    picks.append(f'{pick}')
            nums = ', '.join(picks)
            self.listbox.addItem(nums)
        self.entry.clear()
        self.entry2.clear()


def main():
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

main()