vars.py

#!/usr/bin/env python

"""Looking up environment variables through `vars`."""

def ohai():
    """A simple function."""
    print 'ohai'


class Foo(object):
    """A simple class."""
    def __init__(self):
        print 'Foo'


def find_it(name):
    """Find the environment variable."""
    environment = vars()
    try:
        environment[name]
    except KeyError:
        print 'Nothing found.'


def main():
    find_it('ohai')
    find_it('Foo')
    find_it('ctbarna')

if __name__ == '__main__':
    main()