Question

我有一些代码可以查询广播流中的元数据。它将当前正在播放的歌曲（艺术家-标题）放入一个效果很好的变量中。我想使此脚本连续执行，但仅在歌曲改变时才执行。例如，脚本正在运行...当前正在播放的歌曲是“艺术家1-标题1”，并存储在now_playing中，随着脚本的运行，我希望它检测到now_playing何时实际上不同于之前的内容并执行一个事件

#!/usr/bin/env python
from __future__ import print_function
import re
import struct
import sys
try:
    import urllib2
except ImportError:  # Python 3
    import urllib.request as urllib2

url = 'http://soundcheck.xyz:8000'  # radio stream
encoding = 'latin1' # default: iso-8859-1 for mp3 and utf-8 for ogg streams
request = urllib2.Request(url, headers={'Icy-MetaData': 1})  # request metadata
response = urllib2.urlopen(request)
metaint = int(response.headers['icy-metaint'])
for _ in range(10): # # title may be empty initially, try several times
    response.read(metaint)  # skip to metadata
    metadata_length = struct.unpack('B', response.read(1))[0] * 16  # length byte
    metadata = response.read(metadata_length).rstrip(b'\0')
    # extract title from the metadata
    m = re.search(br"StreamTitle='([^']*)';", metadata)
    if m:
        title = m.group(1)

        if title:

                break
else:
    sys.exit('no title found')

print("Now Playing:" + title.decode(encoding, errors='replace'))
print("Previous Song:" + last_song)

Answer 1

您可以创建一个永远运行的循环：

prev_song = ""
while True:
    # Your code to download song goes here.......

    # Only print the result if changed
    if title != prev_song:
        prev_song = title
        print("Now Playing:" + title.decode(encoding, errors='replace'))

    # Sleep for a little bit before checking again
    time.sleep(5)

变量值更改时触发动作（连续运行）

1 个答案: