How to execute two loop simultaneously in python?

Question

I have two lists:

 host_list = ["10.3.11.250", "10.3.24.45", "10.5.3.5","10.3.4.5"]
 ip_value = ["34.45.34.5", "10.3.11.250","10.3.4.5"]

I want to check whether the data of host_list is present in ip_value or not if it is then append the ip_value to another list. I am doing in this way check the following code:

for host,ip in zip(host_list ,ip_value):
    if host_list == ip_value
        list_ip = list_ip.append(ip)

But it does nothing.Why? and what should list_ip returns it will returns: {"10.3.11.250", "10.3.4.5"}

But more importantly, are the items in host_list some kind of IP objects? Normal strings do not have a .ipv4 or .ipv6 attribute. — Martijn Pieters
– Martijn Pieters, Commented May 30, 2012 at 14:11
OP posted sets (enclosed in {}). Someone edited it to lists (enclosed in []). — eumiro
– eumiro, Commented May 30, 2012 at 14:13
/me steps slowly away from what looks like an edit war in the making.. stets or lists, make up your mind! :-P @eumiro: The OP starts with "I have two lists:". — Martijn Pieters
– Martijn Pieters, Commented May 30, 2012 at 14:13

eumiro · Accepted Answer · 2012-05-30 14:16:44Z

6

These are sets, not lists. You can calculate a difference of them:

list_ip = host_list - ip_value

returns

{'10.5.3.5', '10.3.24.45'}

Edited: ok, now they are two lists. Change the code to:

list_ip = list(set(host_list) - set(ip_value))

returns

['10.5.3.5', '10.3.24.45']

edited May 30, 2012 at 14:16

answered May 30, 2012 at 14:09

eumiro

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Comments

0xc0de · Accepted Answer · 2012-05-30 14:15:06Z

2

Use sets

another_list = list(set(host_list) - set(ip_value))

answered May 30, 2012 at 14:15

0xc0de

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Comments

Pierce · Accepted Answer · 2012-05-30 14:43:32Z

1

To answer the question, why does the code you give do nothing:

for host,ip in zip(host_list ,ip_value): 
    if host_list == ip_value 
        list_ip = list_ip.append(ip)

You are comparing host_list to ip_value, and not comparing host to ip. host_list != ip_value, thus the next statement is never executed.

answered May 30, 2012 at 14:43

Pierce

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