python中xml格式数据的提取

Question

我有以下xml格式的nmap输出：

<ports><extraports state="closed" count="991">
<extrareasons reason="conn-refused" count="991"/>
</extraports>
<port protocol="tcp" portid="22"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="ssh" method="table" conf="3"/></port>
<port protocol="tcp" portid="25"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="smtp" method="table" conf="3"/></port>
<port protocol="tcp" portid="139"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="netbios-ssn" method="table" conf="3"/></port>
<port protocol="tcp" portid="443"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="https" method="table" conf="3"/></port>

我要获取打开的端口号：

print 'Port Number: '+host.find('ports').find('port').get('portid')

但结果只是22。你知道吗

如何获得结果：

22
25
139
443

Answer 1

找到所有port元素，并获得portid属性。你知道吗

使用^{}和list comprehension：

>>> import xml.etree.ElementTree as ET
>>> root = ET.fromstring('''
<ports><extraports state="closed" count="991">
<extrareasons reason="conn-refused" count="991"/>
</extraports>
<port protocol="tcp" portid="22"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="ssh" method="table" conf="3"/></port>
<port protocol="tcp" portid="25"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="smtp" method="table" conf="3"/></port>
<port protocol="tcp" portid="139"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="netbios-ssn" method="table" conf="3"/></port>
<port protocol="tcp" portid="443"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="https" method="table" conf="3"/></port>
</ports>
''')
>>> [port.get('portid') for port in root.findall('.//port')]
['22', '25', '139', '443']