How can I extract video ID from YouTube's link in Python?

I know this can be easily done using PHP's parse_url and parse_str functions:

$subject = "http://www.youtube.com/watch?v=z_AbfPXTKms&NR=1";
$url = parse_url($subject);
parse_str($url['query'], $query);
var_dump($query);

But how to achieve this using Python? I can do urlparse but what next?

Python has a library for parsing URLs.

import urlparse
url_data = urlparse.urlparse("http://www.youtube.com/watch?v=z_AbfPXTKms&NR=1")
query = urlparse.parse_qs(url_data.query)
video = query["v"][0]

I've created youtube id parser without regexp:

def video_id(value):
    """
    Examples:
    - http://youtu.be/SA2iWivDJiE
    - http://www.youtube.com/watch?v=_oPAwA_Udwc&feature=feedu
    - http://www.youtube.com/embed/SA2iWivDJiE
    - http://www.youtube.com/v/SA2iWivDJiE?version=3&amp;hl=en_US
    """
    query = urlparse(value)
    if query.hostname == 'youtu.be':
        return query.path[1:]
    if query.hostname in ('www.youtube.com', 'youtube.com'):
        if query.path == '/watch':
            p = parse_qs(query.query)
            return p['v'][0]
        if query.path[:7] == '/embed/':
            return query.path.split('/')[2]
        if query.path[:3] == '/v/':
            return query.path.split('/')[2]
    # fail?
    return None

Here is RegExp it cover these cases

((?<=(v|V)/)|(?<=be/)|(?<=(\?|\&)v=)|(?<=embed/))([\w-]+)

match = re.search(r"youtube\.com/.*v=([^&]*)", "http://www.youtube.com/watch?v=z_AbfPXTKms&test=123")
if match:
    result = match.group(1)
else:
    result = ""

Untested.

No need for regex. Split on ?, take the second, split on =, take the second, split on &, take the first.

Here is something you could try using regex for the youtube video ID:

# regex for the YouTube ID: "^[^v]+v=(.{11}).*"
result = re.match('^[^v]+v=(.{11}).*', url)
print result.group(1)

I made Mikhail Kashkin's solution Python3 friendly

from urllib.parse import urlparse

def video_id(url):
    """
    Examples:
    - http://youtu.be/SA2iWivDJiE
    - http://www.youtube.com/watch?v=_oPAwA_Udwc&feature=feedu
    - http://www.youtube.com/embed/SA2iWivDJiE
    - http://www.youtube.com/v/SA2iWivDJiE?version=3&amp;hl=en_US
    """
    o = urlparse(url)
    if o.netloc == 'youtu.be':
        return o.path[1:]
    elif o.netloc in ('www.youtube.com', 'youtube.com'):
        if o.path == '/watch':
            id_index = o.query.index('v=')
            return o.query[id_index+2:id_index+13]
        elif o.path[:7] == '/embed/':
            return o.path.split('/')[2]
        elif o.path[:3] == '/v/':
            return o.path.split('/')[2]
    return None  # fail?

来源：https://stackoverflow.com/questions/4356538/how-can-i-extract-video-id-from-youtubes-link-in-python

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python

regex

parsing

url-parsing