Question

我从网络服务器上获取文字并尝试在我的覆盆子pi屏幕上显示当前歌曲。使用LCD 16x2

#!/usr/bin/python
# Example using a character LCD connected to a Raspberry Pi or BeagleBone Black.
import math
import time
import urllib2
from BeautifulSoup import BeautifulSoup


import Adafruit_CharLCD as LCD


page = urllib2.urlopen('http://192.168.0.99:9000/status.html').read()
soup = BeautifulSoup(page)
soup.prettify()
mysong = soup.findAll('div', attrs={'class':'playingSong'}) 
# Print a two line message
lcd.message(mysong)

我已经从上面取出了所有的LCD内容，因为它工作正常，但是不正确。我试图获得的HTML元素是：

 <div class="playingSong"><a href="/songinfo.html?item=683&amp;player=00%3A22%3A19%3A0a%3Af2%3A9f" target="browser">Beetlebum</a>

我收到错误：

pi@raspberrypi ~/Adafruit_Python_CharLCD/examples $ sudo python tom.py          Traceback (most recent call last):
  File "tom.py", line 46, in <module>
    lcd.message(mysong)
  File "build/bdist.linux-armv6l/egg/Adafruit_CharLCD/Adafruit_CharLCD.py", line 247, in message
TypeError: ord() expected string of length 1, but Tag found

Answer 1

您正在将BeautifulSoup.ResultSet（包含Tag个对象）传递给lcd.message()。相反，您需要首先从结果集中获取元素，然后获取元素的文本：

text = mysong[0].getText()
lcd.message(text)

如果您知道只希望匹配一个元素，请使用find代替findAll：

mysong = soup.find('div', attrs={'class':'playingSong'})
text = mysong.getText()
lcd.message(text)

从URL抓取文本并在pi上显示

1 个答案: