Python/LXML/FindAll -无法将元素打印为字符串(python的全新功能)
Python/LXML/FindAll -无法将元素打印为字符串(python的全新功能)
提问于 2018-10-18 04:46:39
当我在“打印”行中使用"findall“时(我在代码中用">>>”注意到了)，列表中的对象显示为XML元素。".text“函数似乎没有任何效果，不管我把它放在行中的什么地方。这些元素都是IPv4或IPv6地址-不确定这是否重要。大多数解决方案都不同于我正在做的事情，我和我的同事被难住了。这是我的第一个Python脚本。
输入样本(缩短)
<rpc-reply xmlns:junos="http://xml.juniper.net/junos/18.2R1/junos">
<isis-database-information xmlns="http://xml.juniper.net/junos/18.2R1/junos-routing" junos:style="extensive">
<isis-database>
<level>1</level>
<isis-database-entry>
-----OUTPUT OMITTED----
<isis-prefix xmlns="http://xml.juniper.net/junos/18.2R1/junos-routing" junos:style="normal">
<protocol-name>IP</protocol-name>
<isis-topology-id>IPV4 Unicast</isis-topology-id>
Trying to print >>> <address-prefix>1.7.11.0/32</address-prefix>
<metric>16</metric>
<prefix-flag>Internal</prefix-flag>
<prefix-status>up</prefix-status>
</isis-prefix>
<isis-prefix xmlns="http://xml.juniper.net/junos/18.2R1/junos-routing" junos:style="normal">
<protocol-name>IP</protocol-name>
<isis-topology-id>IPV4 Unicast</isis-topology-id>
<address-prefix>1.11.12.0/24</address-prefix>
<metric>32</metric>
<prefix-flag>Internal</prefix-flag>
<prefix-status>up</prefix-status>
</isis-prefix>输出示例(缩短)
##################################################
##################################################
LSP ID: D17-HYBC03.00-00
IP Address: [<Element address-prefix at 0x7f4cdd4d0710>, <Element address-prefix at 0x7f4cdd4d0a70>]
IPv4 Node-SID: None
IPv6 Node-SID: None
First SRGB Label: None
Last SRGB Label: None
##################################################
##################################################
LSP ID: D18-HYBC04.00-00
IP Address: [<Element address-prefix at 0x7f4cdd4d0710>, <Element address-prefix at 0x7f4cdd4d0998>]
IPv4 Node-SID: 2018
IPv6 Node-SID: None
First SRGB Label: 16000
Last SRGB Label: 23999
##################################################
##################################################
LSP ID: D07-DSRJ01.00-00
IP Address: [<Element address-prefix at 0x7f4cdd4d0a28>, <Element address-prefix at 0x7f4cdd4d0908>, <Element address-prefix at 0x7f4cdd4d0710>, <Element address-prefix at 0x7f4cdd4d09e0>]
IPv4 Node-SID: 7
IPv6 Node-SID: 1007
First SRGB Label: 16000
Last SRGB Label: 23999
##################################################
##################################################
LSP ID: D08-DSRJ02.00-00
IP Address: [<Element address-prefix at 0x7f4cdd4d0998>, <Element address-prefix at 0x7f4cdd4d0878>, <Element address-prefix at 0x7f4cdd4d0908>, <Element address-prefix at 0x7f4cdd4d0638>]
IPv4 Node-SID: 8
IPv6 Node-SID: 1008
First SRGB Label: 16000
Last SRGB Label: 23999代码
from jnpr.junos import Device
from lxml import etree
####################
###etree.dump(DB)###
####################
if __name__ == '__main__':
NODE = Device(host='x.x.x.x', user='root', password='test').open()
DB = NODE.rpc.get_isis_database_information(level='1', extensive = True, normalize = True, )
DB_ROOT = DB.findall('.//isis-database/isis-database-entry')
for DB_ENTRY in DB_ROOT:
LSPID = 'lsp-id'
PREFIX = 'isis-prefix'
PREFIX_ADDRESS = 'address-prefix'
SID_V4 = 'isis-node-segment/isis-node-segment-ipv4-index'
SID_V6 = 'isis-node-segment/isis-node-segment-ipv6-index'
LABEL_FIRST = 'isis-node-segment/isis-node-segment-block/isis-node-segment-block-first-label'
LABEL_LAST = 'isis-node-segment/isis-node-segment-block/isis-node-segment-block-last-label'
print('#' * 50)
print('#' * 50)
print("LSP ID:\t{LSPID}".format(LSPID=DB_ENTRY.findtext(LSPID)))
>>> print("IP Address:\t{PREFIX_ADDRESS}".format(PREFIX_ADDRESS=DB_ENTRY.findall("isis-prefix/[metric='0']address-prefix")))
print("IPv4 Node-SID:\t{SID_V4}".format(SID_V4=DB_ENTRY.findtext(SID_V4)))
print("IPv6 Node-SID:\t{SID_V6}".format(SID_V6=DB_ENTRY.findtext(SID_V6)))
print("First SRGB Label:\t{LABEL_FIRST}".format(LABEL_FIRST=DB_ENTRY.findtext(LABEL_FIRST)))
print("Last SRGB Label:\t{LABEL_LAST}".format(LABEL_LAST=DB_ENTRY.findtext(LABEL_LAST)))回答 1
Stack Overflow用户
发布于 2018-10-18 06:19:20
如果DB_ENTRY是<isis-database-entry>节点，那么DB_ENTRY.findall("isis-prefix/address-prefix")将会找到所有(2)个<address-prefix>标签的列表。
是的，这就是输出示例中显示的内容：IP Address: [<Element address-prefix at 0x7f4cdd4d0710>,...]
看起来你真的想要两个循环，就像这样：
for DB_ENTRY in list(DB_ROOT):
for ISIS_PREFIX in DB_ENTRY:
print("IP Address:\t{PREFIX_ADDRESS}".format(PREFIX_ADDRESS=ISIS_PREFIX.findall("address-prefix")[0].text))它已更改为ISIS_PREFIX.findall()，而不是DB_ENTRY.findall()。该.findall()返回一个1的列表，因此我在末尾添加了[0]以从列表中获取IP地址节点，然后添加.text以返回实际的IP地址而不是XML节点信息。
我的测试显示了以下输出：
IP Address: 1.7.11.0/32
IP Address: 1.11.12.0/24页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/52863357
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