Flask outputs unrecognizable characters in conzole

Question

I've just installed Flask and it's my first time using it. After following the demo on the site, I managed to set up the webserver, but for some reason, it outputs unreadable characters

D:\Dafuq\SELF\Flask\Blog>python app.py
Unicode characters: љњертѕуиопасдфгхјклчќзџцвбнм
 * Serving Flask app "app" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Restarting with stat
Unicode characters: љњертѕуиопасдфгхјклчќзџцвбнм
 * Debugger is active!
 * Debugger PIN: 782-294-512
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [16/Feb/2019 09:52:35] "[37mGET / HTTP/1.1[0m" 200 -
127.0.0.1 - - [16/Feb/2019 09:52:36] "[33mGET /favicon.ico HTTP/1.1[0m" 404 -

I outputed some unicode characters, and the console prints them with no issue. What could be the problem for the unrecognized characters at the GET request lines?

Thank you

unreadable? which ones? Oh the [33m stuff I suppose. Those are ANSI escape code for colors in console. If the console doesn't understand them or output is redirected, they are displayed as is, and it's ugly — Jean-François Fabre, Feb 16 '19 at 09:03
maybe this can help, or is a duplicate https://stackoverflow.com/questions/14693701/how-can-i-remove-the-ansi-escape-sequences-from-a-string-in-python — Jean-François Fabre, Feb 16 '19 at 09:05

score 1 · Answer 1 · answered Sep 20 '19 at 20:27

1

Do you use a "termcolor" package or something that deals with colors in the terminal? I just deleted it and the problem disappeared.

answered Sep 20 '19 at 20:27

Akari Amano

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score 1 · Answer 2 · answered Feb 07 '21 at 16:29

1

I know this is old, but I had the same issue and wanted to share. This seems to be a problem with Windows, as stated in this issue.

The following fixed it:

import os
import sys

if sys.platform.lower() == "win32": 
    os.system('color')

answered Feb 07 '21 at 16:29

Pyxels

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score 0 · Answer 3 · answered Jun 12 '21 at 22:09

The following solution taken from this SuperUser post worked for me to remove the ANSI characters:

The registry key at HKEY_CURRENT_USER\Console\VirtualTerminalLevel sets the global default behavior for processing ANSI escape sequences. Create a DWORD key (if necessary) and set its value to 1 to globally enable (or 0 to disable`) ANSI processing by default.
[HKEY_CURRENT_USER\Console]
"VirtualTerminalLevel"=dword:00000001

Flask outputs unrecognizable characters in conzole

3 Answers3