keep getting 'encoding' error

[snippsat]

Do you use Python 3.6 as i posted link to?
# coding=utf-8 is not needed in Python 3 as it's use utf-8 as default encoding.
Here a example:
hello.py saved in folder C:\foo\hello.py

print("Hello World")

Start cmd:

Microsoft Windows [Version 10.0.16299.248]
(c) 2017 Microsoft Corporation. Med enerett.

C:\WINDOWS\system32>cd\

# Test python version
C:\>python -V
Python 3.6.4

# Test pip
C:\>pip -V
pip 9.0.1 from c:\python36\lib\site-packages (python 3.6)

# Run with path to file
C:\>python C:/foo/hello.py
Hello World

# Navigate to foo folder and run
C:\>cd foo
C:\foo>python hello.py
Hello World

C:\foo>

If this doesn't work try saving hello.py with and other editor.
To make sure that that editor you use don't mess up with byte order mark (BOM).