Question

[...]
    soup = BeautifulSoup(url) 
    for row in soup.find("table", { "class" : "grid-border-args" }).findAll("tr"):
        if row.find("td", {"class" : "row-label-one"}) != None:
            uur = row.find("td", {"class" : "row-label-one"})
            if row.find("td", {"class" : "object-cell-border"}) != None:
                vakken = row.findAll("td", {"class" : "object-cell-border"})
                for vak in vakken:
                    duur = vak.find("td", {"class" : "object-cell-border"}).attrs["rowspan"]

此代码呈现错误：“'NoneType'对象没有属性'attrs'” 返回“none”确实是正确的，但我不明白为什么，因为每个'vak'都以td类开头，并且具有我正在寻找的属性。例如：

<td class="object-cell-border" colspan="1" rowspan="4" style="border-right:3px solid #000000;">
<!-- START OBJECT-CELL -->
<table border="0" cellspacing="0" class="object-cell-args" width="100%">
<col class="object-cell-0-0"></col>
<tr>
<td align="left">Lineaire algebra : stelsels, matrices en afbeeldingen</td>
</tr>
</table>
<table border="0" cellspacing="0" class="object-cell-args" width="100%">
<col class="object-cell-1-0"></col>
<col class="object-cell-1-2"></col>
<tr>
<td align="left">D.0.02</td>
<td align="right">3-6, 8, 10-14</td>
</tr>
</table>
<table border="0" cellspacing="0" class="object-cell-args" width="100%">
<col class="object-cell-2-0"></col>
<col class="object-cell-2-2"></col>
<tr>
<td align="left">CARA PHILIPPE</td>
<td align="right"></td>
</tr>
</table>
<!-- END OBJECT-CELL -->
</td>

为什么不让我获得第一个td-tag？

Answer 1

这部分需要嵌套td个元素object-cell-border：

vakken = row.findAll("td", {"class" : "object-cell-border"})
for vak in vakken:
    duur = vak.find("td", {"class" : "object-cell-border"}).attrs["rowspan"]

也就是说，首先您找到该类的所有td元素并将其分配给vakken。然后，对于每个td，您在其中搜索以找到具有相同类的后代td。

BeautifulSoup：找不到具有特定属性的标签

1 个答案: