Python BS:获取具有和不具有颜色属性的行 [英] Python BS: Fetching rows with and without color attribute
问题描述
我有一些看起来像这样的html(表示表中的数据行，即 tr 和/tr 之间的数据是表中的一行)
I have some html that looks like this (this represents rows of data in a table, i.e the data between tr and /tr is one row in a table)
<tr bgcolor="#f4f4f4">
<td height="25" nowrap="NOWRAP"> CME_ES </td>
<td height="25" nowrap="NOWRAP"> 07:58:46 </td>
<td height="25" nowrap="NOWRAP"> Connected </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 07:58:00 </td>
**<td height="25" nowrap="NOWRAP" bgcolor="#55aa2a"> --:--:-- </td>**
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 01:25:00 </td>
<td height="25" nowrap="NOWRAP"> 22:00:00 </td>
</tr>
.
.
.
<tr bgcolor="#ffffff">
<td height="25" nowrap="NOWRAP"> CME_NQ </td>
<td height="25" nowrap="NOWRAP"> 07:58:46 </td>
<td height="25" nowrap="NOWRAP"> Connected </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 191 </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 07:58:01 </td>
**<td height="25" nowrap="NOWRAP"> --:--:-- </td>**
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 0 </td>
<td height="25" nowrap="NOWRAP"> 01:25:00 </td>
<td height="25" nowrap="NOWRAP"> 22:00:00 </td>
</tr>
我有从每个行集中获取颜色的代码:
I have code that grabs the color from each row set:
mrkt_stat = []
for td in site.findAll('td'):
if 'bgcolor' in td.attrs:
mrkt_stat.append(td.attrs['bgcolor'])
问题是，当行集没有 bgcolor 属性时，没有数据添加到 mrkt_stat 列表中.
Issue is that when the row set has no bgcolor attribute, no data is added to mrkt_stat list.
我该如何抓取，以便即使某行没有bgcolor attr，它仍将以NULL或N/A的形式添加到列表中?
How do I scrape this so that even if a row has no bgcolor attr, it will still be added to the list as NULL or N/A?
知道bgcolor attr(可能存在或可能不存在)将始终出现在行的第9行中(无论该行是否具有attr)都很有用(请查看用**括起来的html行) )
It is useful to know that the bgcolor attr (that may or may not be present) will always appear in the 9th line of a row set whether that row has the attr or not (look at the html lines enclosed with **)
输出应如下所示(每行集第9行的所有颜色属性列表，如果不存在颜色属性，则显示'N/A'):
Output should look like the following (a list of all color attrs from row 9 of each row set and display 'N/A' if there is no color attr present):
['#55aa2a',...,'N/A']
推荐答案
我想出了解决方法，尽管方法相当长，但是仍然可以解决问题
I figured out how to solve this, albeit a rather long approach, but solves the issue nontheless
keys = []
for tr in site.find_all('br'):
for td in site.find_all('tr'):
if td in keys:
pass
else:
keys.append(td)
del keys[:4]
for i in range(0, len(keys)):
g = keys[i]
color = []
for line in g:
color.append(line)
del color[:17]
check = []
h = color[0]
if 'bgcolor' in h.attrs:
check.append(h['bgcolor'])
else:
check.append('N/A')
总结到h = color[0]行是将行集的第9行存储到变量h中，然后检查bgcolor是否在此标记的属性中.如果是，它将被添加到check列表中，否则将被添加到'N/A'
To summarize up to the line h = color[0] is where I store the 9th line of the row set into a variable h and then I check if the bgcolor is in the attributes of this tag. If it is, it gets added to the check list if not, then 'N/A' gets added instead
如果能弄清楚如何缩短这种方法的话，敬请原谅:)！
GREATLY APPRECIATED if one can figure out how to shorten this approach though :)!
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