Having Python 3.7.6 and having already installed pyserial, pip install pyserial --user Requirement already satisfied: pyserial in c:\users\myusername\appdata\local\programs\python\python37\lib\site-packages (3.4) pip install pyserial Requirement already satisfied: pyserial in c:\users\myusername\appdata\local\programs\python\python37\lib\site-packages (3.4) I expect that I can import serial via import serial which fails. No module named 'serial' This is as follows python3 Python 3.7.6 (tags/v3.7.6:43364a7ae0, Dec 19 2019, 01:54:44) [MSC v.1916 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import serial Traceback (most recent call last): File "<stdin>", line 1, in <module> ModuleNotFoundError: No module named 'serial' Am I doing any mistake? PS. The result of import sys; print(sys.path) is [ '', 'C:\\Program Files\\WindowsApps\\PythonSoftwareFoundation.Python.3.7_3.7.1776.0_x64__qbz5n2kfra8p0\\python37.zip', 'C:\\Program Files\\WindowsApps\\PythonSoftwareFoundation.Python.3.7_3.7.1776.0_x64__qbz5n2kfra8p0\\DLLs', 'C:\\Program Files\\WindowsApps\\PythonSoftwareFoundation.Python.3.7_3.7.1776.0_x64__qbz5n2kfra8p0\\lib', 'C:\\Program Files\\WindowsApps\\PythonSoftwareFoundation.Python.3.7_3.7.1776.0_x64__qbz5n2kfra8p0', 'C:\\Program Files\\WindowsApps\\PythonSoftwareFoundation.Python.3.7_3.7.1776.0_x64__qbz5n2kfra8p0\\lib\\site-packages' ] PS. The result of where pip is C:\Users\myusername\AppData\Local\Programs\Python\Python37\Scripts\pip.exe C:\Users\myusername\AppData\Local\Microsoft\WindowsApps\pip.exe Continue reading...