Remove a column from multiple files

[skiabox]

I have a group of files (A.txt, AA.txt etc) in the form

A.txt :
A,45,56,78,98,11,23
A,98,90,33,76,30,40

AA.txt :
AA,65,76,34,76,98,12
AA,12,76,33,76,33,89

How can I quickly remove the symbol column (A,AA) from all these files using Python?
(I want to use python because the number of txt files is 3200)

Thank you.

[Gribouillis]

You can try something like this

#!/usr/bin/env python
# -*-coding: utf8-*-
# Title: remcol.py

# WARNING: UNTESTED

import os

class Error(Exception):
    pass

def remove_column(srcdir, dstdir = None):
    if dstdir is None:
        dstdir = os.path.join(os.path.expanduser("~"), "columnremoved")
    if os.path.exists(dstdir):
        # this guarantees that this function won't overwrite anything on the disk
        raise Error(("destination directory exists", dstdir))
    else:
        os.mkdir(dstdir)
    for filename in os.listdir(srcdir):
        if not filename.endswith(".txt"):
            continue
        inname = os.path.join(srcdir, filename)
        outname = os.path.join(dstdir, filename)
        with open(outname, "w") as ofh:
            with open(inname, "r") as ifh:
                for line in ifh:
                    line = line.split(",", 1)[1]
                    ofh.write(line)
    return dstdir

if __name__ == "__main__":
    dstdir = remove_column(r"/path/to/the/directory/containing/the/3200/files")
    print("output files written to directory '%s'" % dstdir)

[skiabox]

Man that was awesome.Python is really quick!It processed all this files in about 5 seconds!I am stunned!By the way what books do you suggest so that I can learn python?
Thank you again for this exceptional script.

[Gribouillis]

By the way what books do you suggest so that I can learn python?

I suggest to start with 'dive into python' (or into python 3 if you want to use python 3). Notice that a good part of proficiency in python programming comes from knowing existing libraries (especially the standard library). This can be acquired only by writing many scripts (and reading the python forum).