Untitled

#Left, Middle, Right
from PyQt5.QtCore import Qt

from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QRadioButton, QVBoxLayout, QHBoxLayout, QGroupBox, QPushButton

app = QApplication([])

window = QWidget()
window.setWindowTitle('Left, Middle, Right')
window.resize(400, 200)

btn1 = QPushButton('Left')
btn2 = QPushButton('Middle')
btn3 = QPushButton('Right')

v_main = QVBoxLayout()

hl_1 = QHBoxLayout()
hl_1.addWidget(btn1)
hl_1.addWidget(btn2)
hl_1.addWidget(btn3)

v_main.addLayout(hl_1)

window.setLayout(v_main)

window.show()

app.exec_()