[Python] PYQt graph plot widget output not plotting as required

Can please someone help me with pyqt graph output. The issue is it looks like y axis is floating. There is gap from 0 to 5 on y axis as shown in figure below: enter image description here

Please assist. Thanks!

This is a simple testing code:

import sys
from PyQt5.QtWidgets import QApplication
import pyqtgraph as pg

app = QApplication(sys.argv)
pg.plot(x = [0,1,2,4], y = [5,6,7,8])
status = app.exec_()
sys.exit(status)


A possible solution for the problem

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