Случайная строка из файла на PyQt5

from PyQt5.Qt import *
from random import choice
import sys
 
 
class Widget(QWidget):
    def __init__(self):
        super().__init__()
        self.setFixedSize(300, 200)
        self.lay = QVBoxLayout()
        self.edit = QLineEdit()
        self.btn = QPushButton('Click')
        self.lay.addWidget(self.edit)
        self.lay.addWidget(self.btn)
        with open('in.txt', 'r') as f:
            self.txt = f.readlines()
        self.btn.clicked.connect(lambda : self.edit.setText(choice(self.txt)))
        self.setLayout(self.lay)
 
 
 
if __name__ == "__main__":
    app = QApplication(sys.argv)
    ui = Widget()
    ui.show()
    sys.exit(app.exec_())

from PyQt5.Qt import QApplication, QWidget, QPushButton, QLineEdit, QVBoxLayout
import sys
import random
 
 
class W(QWidget):
    def __init__(self):
        super().__init__()
        self.btn = QPushButton('Click')
        self.edit = QLineEdit()
 
        with open('in.txt', 'r') as f:
            self.txt = f.readlines()
 
        self.btn.clicked.connect(self.btn_onclick)
        self.setFixedSize(300, 200)
        layout = QVBoxLayout()
        layout.addWidget(self.btn)
        layout.addWidget(self.edit)
        self.setLayout(layout)
 
    def btn_onclick(self):
        self.edit.setText(random.choice(self.txt))
 
 
if __name__ == "__main__":
    app = QApplication(sys.argv)
    ui = W()
    ui.show()
    sys.exit(app.exec_())