Docopt and Classes - class

Question

Ive gotten quite comfortable over the last year coding in python on an off, but I have stayed away from Classes (as in structuring my code in them) because I have not understood them.
I am now trying to get my head around what I need to change in my coding practices to take advantage of using Classes in all their glory.
I have been trying to use an example script I wrote and pipe that to a Class based version. Safe to say I am sucking bad and cant get my simple script to work. Im sure there are a myriad of this Im most likely doing incorrectly. I would really appreciate someone pointing them out to me.
I dont mind finger points and belly laughs too ^_^
Coder After (not working)
"""
Description:
This script is used to walk a directory and print out each filename and directory including the full path.
Author: Name
Usage:
DirLister.py (-d <directory>)
DirLister.py -h | --help
DirLister.py --version
Options:
-d <directory> The top level directory you want to list files and directories from.
-h --help Show this screen.
--version Show version.
"""
import os
from docopt import docopt
class walking:
def __init__(self, directory):
self.directory = arguments['-d']
def walk(self, directory):
for root, dirs, files in os.walk(self.directory):
for filename in files:
print os.path.join(root, filename)
if __name__ == '__main__':
arguments = docopt(__doc__, version= '1.0.0')
print arguments
if arguments['-d'] is None:
print __doc__
exit(0)
else:
walking.walk(directory)
Original Non-Class Based Code (working)
"""
Description:
This script is used to walk a directory and print out each filename and directory including the full path.
Author: Name
Usage:
DirLister.py (-d <directory>)
DirLister.py -h | --help
DirLister.py --version
Options:
-d <directory> The top level directory you want to list files and directories from.
-h --help Show this screen.
--version Show version.
"""
import os
from docopt import docopt
arguments = docopt(__doc__, version= '1.0.0')
def walk(dir):
for root, dirs, files in os.walk(dir):
for filename in files:
print os.path.join(root, filename)
if __name__ == '__main__':
if arguments['-d'] is None:
print __doc__
exit(0)
else:
walk(arguments['-d'])

Answer 1

You've forgotten to post the error you get (since you say it's not working).
But indeed there are several issues. First, I'd call the class Walking.
Then in your __init__ function, you try to access arguments which is neither a global variable nor an argument; you wanted to write:
def __init__(self, directory):
self.directory = directory
But you also need to create an instance of your class in you main:
walking = Walking(arguments['-d'])
That assumes that the name of the class is Walking instead of walking. I advise you to look at PEP8 for the naming conventions.
The general idea is that the class is the type of an object, but not the object itself*, so the class Walking: block is basically defining a new kind of objects. And then you can create objects that are instances of this class. It's the same when you create a list: mylist = list() (but there are also other ways for lists like mylist = [1, 2]).
*It happens that most things in Python are objects, including classes, but they have obviously other methods and they have another base class.