[Python] Python printing text: Highlight or mark some text in the string with indicators

I want to print a string buffer (or byte array) which could contains some special characters, such as \t and \n, besides that, I need to print some indicators below the line to indicate some special part of the string, something like below:

a b c d \t , e f g \n
~~~~~~~~ ^^^^^


Here is the questions:

1, the escape char and the normal char should be printed in a fixed width, but I see that repr() function can not.

2, some indicator below the first line should be printed.

3, if we still use repr() function, then I think the marker in the second line should be calculated dynamically, because repr() don't print texts in a fixed width format, thus a \t takes two chars.

Any one can help?

BTW: the whole idea is that I want to create a python pretty printer for GDB to show a token when debugging a parsing algorithm.

EDIT: Here is an example:

print (repr("abcd\t,efg\n"))


when you run the code, you get a printed string which has 12 element instread of 10, for me, ff I want to hight the token "efg", which is the index 6,7,8 in the string, if I draw a markers in the second from the index 6,7,8, I get the following.

abcd\t,efg\n
~~~


Because the "\t" has two chars not the one, which means the function repr() don't print fixed witdh chars, in this case, I would like to see:

abcd\t,efg\n
~~~

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