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Recursively list all files in directory (Unix)

Sairah George Published at Dev
21
Sairah George

I am trying to list all files a directory recursively using python. I saw many solutions using os.walk. But I don't want to use os.walk. Instead I want to implement recursion myself.

import os
fi = []
def files(a):
        f =  [i for i in os.listdir(a) if os.path.isfile(i)]
        if len(os.listdir(a)) == 0:
                return
        if len(f) > 0:
                fi.extend(f)
        for j in [i for i in os.listdir(a) if os.path.isdir(i)]:
                files(j)


files('.')
print fi

I am trying to learn recursion. I saw following Q?A, but I am not able to implement correctly it in my code.

Elisha

os.listdir return only the filename (without the full path) so I think calling files(j) will not work correctly.
try using files(os.path.join(dirName,j))

or something like this:

def files(a):
    entries =  [os.path.join(a,i) for i in os.listdir(a)]

    f =  [i for i in entries if os.path.isfile(i)]
    if len(os.listdir(a)) == 0:
            return
    if len(f) > 0:
            fi.extend(f)
    for j in [i for i in entries if os.path.isdir(i)]:
            files(j)

I tried to stay close to your structure. However, I would write it with only one loop over the entries, something like that:

def files(a):
    entries =  [os.path.join(a,i) for i in os.listdir(a)]
    if len(entries) == 0:
            return

    for e in entries:
        if os.path.isfile(e):
            fi.append(e)

        elif os.path.isdir(e):
            files(e)

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