完全匹配字符串列表中的字符串

Question

I have a list of a device's port numbers that I want to match against but I don't want duplicates and it needs to match exactly.

Here's an example of the list:

port_list = ['port 1.1', 'port 1.2', 'port 1.3', 'port 1.4', 'port 1.5', 
'port 1.6', 'port 1.7', 'port 1.8', 'port 1.9', 'port 1.10','port 1.11', 
'port 1.12', 'port 1.13', 'port 1.14', 'port 1.15', 'port 1.16', 'port 1.17', 
'port 1.18', 'port 1.19', 'port 1.20', 'port 1.21',  'port 1.22','port 1.23', 
'port 1.24']

I found this code that works except for when I have say port 1.23 it matches the correct port but also 1.2 or for port 1.16 I also get a match for port 1.1.

matches = {x for x in port_list if x in output}

This is the output I pull the port from in an earlier part of the script

LAB-5150-MES1.NMD*> config search string "virtual-switch ethernet add"
virtual-switch ethernet add vs 022NMD001111BL port 1.20 vlan 4
virtual-switch ethernet add vs 022NMD002222BL port 1.21 vlan 20
virtual-switch ethernet add vs 022NMD003333BL port 1.23 vlan 452

Then here's what I'm trying to accomplish with pulling the port from above but it's matching on that extra port.

LAB-5150-MES1.NMD*> lldp set port 1.2 mode tx-rx notification off
LAB-5150-MES1.NMD*> lldp set port 1.20 mode tx-rx notification off
LAB-5150-MES1.NMD*> lldp set port 1.23 mode tx-rx notification off
LAB-5150-MES1.NMD*> lldp set port 1.21 mode tx-rx notification off

Answer 1

output must be a string, right? That's why 'port 1.1' in output is True when it's actually 'port 1.16' . So you could simply divide it in a list and check if the number of the port is in it:

matches = {x for x in port_list if x.split()[1] in output.split()}

No need to use regex ;)

Edit: x.split() divides the string in a list. Each division is on a space. So the result of it is ['port', '1.16' ]. We use the [1] index notation to specify the object on index 1 (python index start on 0) - '1.16' . That way, we're checking if the number is on the list of words on output .

Answer 2

你可以做

matches = {x for x in port_list if x == output}

Answer 3

With the in operator you're using substring match, which is why when output contains port 1.23 , it also matches port 1.2 . In this case you should use regex to make sure that the match occurs only on word boundaries.

import re
matches = re.findall('\b(?:%s)\b' % '|'.join(port_list), output)