Contextmanager usage to make error handling more pythonic. Back ported ignored from Py3K.

gistfile1.py

"""Example taken from Raymond Hettinger's Pycon 2013 talk"""
import sys
import os
from contextlib import contextmanager

_file_name = "Exampl3.fil3.tmp"


def terrible_example():
    """Terrible. Race condition"""
    if os.path.exists(_file_name):
        os.remove(_file_name)


def bad_example():
    """Solves Race condition. Ask for forgiveness, not permission model.
     Not very pythonic.
    """
    try:
        os.remove(_file_name)
    except OSError:
        pass


@contextmanager
def ignored(*exceptions):
    try:
        yield
    except exceptions:
        pass


def good_example():
    """Pythonic approach a using contextmanager"""
    with ignored(OSError):
        os.remove(_file_name)


def main():
    terrible_example()
    bad_example()
    good_example()
    return 0


if __name__ == '__main__':
    sys.exit(main())