import os

def findFilesRecursively(path, pred = None, ls = None):
    if not ls:
        ls = []

    for p in os.listdir(path):
        p = os.path.join(path, p)
        if os.path.isdir(p):
            findFilesRecursively(p, pred, ls)
        elif os.path.isfile(p):
            if not pred or pred(p):
                ls.append(p)

    return ls

ls = findFilesRecursively(os.getcwd(), lambda x: x.endswith('.py'))
for f in ls:
    print(f)