Search/[delete] multiple word processor files

#!/usr/bin/env python3

#Dependencies: catdoc, Python 3.x
#on Ubuntu, you can install it with this: sudo apt-get install catdoc

import subprocess, shlex, glob, os, zipfile, re, html.parser, sys;

def files_with_word(word, path, delete=None):
    if delete==None or delete=="delete" or delete==True or delete==False:
        pass;
    else:
        print("The third argument must either be the word, ‘delete’, or it must be omitted.\n\nNo files deleted.");
        return;
    files_with_word_list=[];
    for x in glob.glob(os.path.join(path, "*.doc")):
        command=shlex.split('catdoc -w "' + x + '"');
        file_text, err=subprocess.Popen(command, stdout=subprocess.PIPE).communicate();
        if word in str(file_text):
            files_with_word_list.append(x);
    for x in glob.glob(os.path.join(path, "*.docx"))+glob.glob(os.path.join(path, "*.odt")):
        z=zipfile.ZipFile(x);
        zippath="word/document.xml";
        if x.endswith("odt")==True:
            zippath="content.xml";
        file_text=z.read(zippath).decode();
        file_text=re.sub(r"<[^>]*>", r"", file_text)[1:];
        file_text=html.parser.HTMLParser().unescape(file_text);
        #print(file_text); #This is for debugging purposes.
        if word in file_text:
            files_with_word_list.append(x);
    print("\n".join(files_with_word_list));
    if delete=="delete" or delete==True:
        for x in files_with_word_list:
            print("Deleting " + x);
            os.remove(x);

if len(sys.argv)<=2 or len(sys.argv)>4:
    if len(sys.argv)==2 and sys.argv[1] not in {"--help", "-h", "--h", "-help"}:
        answer=input("Do you wish to delete the files? ");
        if answer.lower().strip() in {"y", "yes", "sure", "okay", "yeah", "yep", "yea", "of course", "certainly", "assuredly", "affirmative", "why not"}:
            files_with_word(sys.argv[1], "", "delete");
        else:
            files_with_word(sys.argv[1], "");
            print("(Files not deleted.)");
    else:
        print("This program searches word processor files (doc, docx and odt) for words or phrases, and optonally allows you to delete any matches it finds.\nUsage:\nfindwpdir.py phrase path [delete]\n(You may omit the path for the current directory.)");
else:
    try:
        files_with_word(sys.argv[1], sys.argv[2], sys.argv[3]);
    except IndexError:
        files_with_word(sys.argv[1], sys.argv[2]);