Python: Make a class to read files in a directory

I am trying to teach myself how to make classes in Python. I am currently able to write a class that enables me to draw multiple shapes using the same class which is pretty basic.

I am having trouble with more advanced tasks using classes, for instance I would like to be able to make a class which includes functions such as how many files are in a particular directory.

I guess my question is How would I make a class that reads into a directory and tell me how many files are in the directory?

Thanks, sorry if it isnt clear


The function you are looking for is os.listdir.

Given a directory /tmp/foo with files named bar and baz:

>>> import os
>>> os.listdir('/tmp/foo')
['baz', 'bar']

When you use os.listdir, you will also want to use os.path.isfile to test whether each entry you are dealing with is actually a file, since directory names are returned as well.

It seems a bit overkill to use a class, but here's a starting point:

import os

class DirectoryLister(object):
    def __init__(self, *args): = os.listdir(*args)

    def count(self):
        return len(

Used like:

dl = DirectoryLister('/home/jon')
print dl.count

You may also want to offer other argument to filter out non-files, or potentially look at glob to do wild card matching, etc...

os.listdir() returns a list of contents of a directory. If I understood the question correctly.

So a class would hold a function wrapper for that function, if you would like to make a new class for it. Not sure what you mean with "reads into a directory"

class YourClass:

    def __init__(self):
         #initialize here

    def countFilesInDir(self,directory):
         return len(os.listdir(directory))

or something like that

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