IDLE 3.8.3 -- bug report

[Halvard Tislavoll]

I'am dealing with a bug

My machine:        
                    Type: Laptop
                    System: Hewlett-Packard
                    product: HP EliteBook 8770w
                    v: A1029D1102
                    Prosessor: Intel© Core™ i7-3720QM CPU @ 2.60GHz × 4
                    RAM: 15.6 GiB
                    Hd: 2577.6 GB
                    Graphic card: NVIDIA Corporation GK104GLM [Quadro K3000M]

Operating system:   Linux Mint 20 Cinnamon
                    Cinnamon version: 4.6.6
                    Linux kernal: 5.4.0-42-generic

pyenv 1.2.20
Python 3.8.4 (default, Jul 20 2020, 20:20:14)
IDLE 3.8.4

I have been using IDLE for many years. But now I can not do it.

Example:
I write a heading for a python script in my text editor, xed and save as 'test.py'.
..............................................................................................................................
    #! /usr/bin/env python
    #  -*- coding: utf-8 -*-

    # ... pandas-techniques-python-data-manipulation/

    import pandas as pd
    import numpy as np

    #-----------------------------------------------------------
...............................................................................................................................
Then I open 'test.py' in IDLE. Everything looks normal.

I am testing whether it is possible to save with the shortcut ctrl-s. OK.

But then I write the following line:

    print ("\ n # 1 - Boolean Indexing in Pandas \ n")

Result:
storage no longer works. And IDLE becomes useless!

The problem is that print statement no longer support my sign "-" U + 2013 EN DASH

but this sign goes well;  "-" U + 002D HYPHEN-MINUS

Want to get this fixed

Thank you in advance, Halvard Tislavoll