Retrieves a variable amount of random files of a given type and copys them to an output directory

Randomizer

import sys
import os
import string
import random
import shutil

# Usage: "python Randomizer.py root_dir out_dir number_to_get [file_extensions]"
# file_extensions e.g. -> ".mp3 .wav .ogg .flac"

if __name__ == '__main__':
    # Directory to get stuff, number of stuff to get
    root = sys.argv[1]
    out = sys.argv[2]
    num = sys.argv[3]
    
    # List of exceptable file extensions
    file_types = list()  
    for arg in list(sys.argv[4:]):
        file_types.append(arg)
        
    #clear output dir
    for out_root, out_subFolders, out_files in os.walk(out):
        for file in out_files:
            os.remove(os.path.join(out,file))
      
    #create candidates for random list
    candidate_list = list()       
    for in_root, in_subFolders, in_files in os.walk(root):
        for file in in_files:
            ext_index = string.rfind(file,".")
            if ext_index != -1: #no extension
                for type in file_types:
                    if file[ext_index + 1:] == type:
                        candidate_list.append([os.path.join(in_root,file), file])
    
    #shuffle the mo' fuckas
    random.shuffle(candidate_list)

    #slice em to the number we gave
    final_list = candidate_list[:int(num)]
    
    #copy the files
    for list in final_list:
        shutil.copyfile(list[0],os.path.join(out,list[1]))