multithreading for youtube-dl

import youtube_dl
import threading
import sys

# help command
if sys.argv[1] == "help":
    print("Usage: python multithreaded.py YT-Playlist-Link")
    print("Usage: python multithreaded.py YT-Playlist-Link StartAtInt")
    print("Usage: python multithreaded.py YT-Playlist-Link StartAtInt EndAtInt")
    sys.exit(0)

# Optional StartAt and EndAt parameter
hasstart = False
hasend = False
try:
    if sys.argv[2] != None:
        hasstart = True
        startat = int(sys.argv[2])

    if sys.argv[3] != None:
        hasend = True
        endat = int(sys.argv[3])
except:
    pass

# Method executed by individual threads
def download(url: str, title: str):
    ydl_opts = {
        'format': 'best',
        'outtmpl': title + '.%(ext)s',
        'noplaylist': True,
        'ignoreerrors': True,
        'abort_on_unavailable_fragments': True,
        'quiet': True,
    }
    try:
        with youtube_dl.YoutubeDL(ydl_opts) as ydl:
            ydl.download([url])
            print("Download comlete: " + title)
    except Exception as e:
        print("Download exception: " + str(e))

# Select options based on input parameters
if not hasstart and not hasend:
    ydl_opts = {
        'ignoreerrors': True,
        'abort_on_unavailable_fragments': True,
    }
elif hasstart and not hasend:
    ydl_opts = {
        'ignoreerrors': True,
        'abort_on_unavailable_fragments': True,
        'playliststart': startat,
    }
elif hasend:
    ydl_opts = {
        'ignoreerrors': True,
        'abort_on_unavailable_fragments': True,
        'playliststart': startat,
        'playlistend': endat,
    }

# Get all videos in the playlist and run download in individual thread
try:
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        result = ydl.extract_info(sys.argv[1], download=False)
        for video in result['entries']:
            try:
                threading.Thread(target=download, args=(video['webpage_url'], video['title'])).start()
            except:
                print("Skipped one due to error")
                continue
except KeyboardInterrupt:
    # Doesnt work for some reason
    for thread in threading.enumerate():
        thread.join()
except Exception as e:
    print("General exception: " + str(e))