Print with line and file information

#!/usr/bin/env python
# -*-coding: utf8-*-
# Module: printat (python 2 and 3)
# Author: Gribouillis for the python forum at www.daniweb.com
# Date: 2014 June 02
# License: Public Domain
# Use this code freely

from __future__ import (absolute_import, division,
                        print_function, unicode_literals)
__version__ = "0.0.3"
import sys


def this_line(level = 0):
    """return a pair (lineno, filename) where this function is called

    If level > 0, go back up to that level in the calling stack.
    
    The filename is the name in python's co_filename member
    of code objects.
    """
    frame = sys._getframe(level + 1)
    try:
        lineno = frame.f_lineno
        filename = frame.f_code.co_filename
        return (lineno, filename)
    finally:
        del frame

def printat(*args, **kwargs):
    """Print function with additional line number and filename information.
    
    Adds a string such as "at line 31 in foo.py" to the printed output,
    to indicate the position where the printat() function was called.

    All the calls to print() in a program can be changed
    to provide additional information by adding
    
        print = printat
        
    at the top of the program.
    """
    lineno, filename = this_line(1)
    args += ('at line {n} in {f}'.format(n=lineno, f=filename),)
    print(*args, **kwargs)
    
if __name__ == '__main__':
    printat("Hello World!")

""" my output -->
$ python printat.py
Hello World! at line 49 in printat.py
"""