How to colorize the output of Python errors in the Gnome terminal?

Question

Note: I am asking this question after researching how to actually do it. Other questions which are somewhat similar, but actually differ from my question relate to:

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Answer 1

FWIW, you can wrap the script in a main function, and call the main function within a try ... except block, get the error message, colourize it and print it;

To get the error message you need a call to sys.exc_info. traceback.format_exception formats the stack-trace and the exception information. Using basic regex you can wrap every ..Err.. inside a \033[91m...Err...\033[0m which turns the colour into red:

def main():
   with open('xxx.txt', 'r') as fin:
        return fin.read()

try:
    main()
except:
    import re
    from sys import exc_info
    from traceback import format_exception

    RED, REV = r'\033[91m', r'\033[0m'
    err = ''.join(format_exception(*exc_info()))
    print(re.sub(r'(\w*Err\w*)', RED + r'\1' + REV, err))

Result: