[Python] How to install the PyQt5?

I have been searching to resolve this problem for two days. I tried a lot of ways, searched the answer on google, but didn't find a single solution to the problem. I want to know why PyQt5 is not working even if it is installed.

Although the pip show option is working, and the pip install option is already satisfied but it is still causing the issue and the code is not executing.

Code

from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow
import sys

def window():
app = QApplication(sys.argv)
win = QMainWindow()
win.setGeometry(1000, 200, 300, 300)
win.setWindowTitle("ibilalkayy")

win.show()
sys.exit(app.exec_())
window()


pip show PyQt5 result

Name: PyQt5
Version: 5.15.2
Summary: Python bindings for the Qt cross platform application toolkit
Home-page: https://www.riverbankcomputing.com/software/pyqt/
Author: Riverbank Computing Limited
Author-email: info@riverbankcomputing.com
License: GPL v3
Location: /usr/lib/python3/dist-packages
Requires: PyQt5-sip
Required-by: PyQtWebEngine


pip install PyQt5==5.15.2

Requirement already satisfied: PyQt5==5.15.2 in /usr/lib/python3/dist-packages (5.15.2)
Requirement already satisfied: PyQt5-sip<13,>=12.8 in /usr/lib/python3/dist-packages (from PyQt5==5.15.2) (12.8.1)


Code execution and error

python3 /Path/to/tutorial.py
Traceback (most recent call last):
File "/Path/to/tutorial.py", line 1, in <module>
from PyQt5 import QtWidgets
ModuleNotFoundError: No module named 'PyQt5'

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