[Tutor] Validating String contains IP address

[Ed Manning]

Thank you very much 

Sent from my iPhone

> On Apr 3, 2017, at 7:04 PM, Martin A. Brown <martin at linux-ip.net> wrote:
> 
> 
> Hello there,
> 
>> what am I going wrong here? i need to validate this is an IP or ask 
>> the question again
>> 
>> untrust_ip_address = raw_input('\nEnter the  untrust IP ''"Example 172.20.2.3/28"'':')
> 
> This is a representation of an IP address along with the mask length for the
> prefix:
> 
>  172.20.2.3/28 
> 
> That is not, strictly speaking an IP, because there is ancillary 
> information included.  This corresponds to:
> 
>  172.20.2.3     IP address
>  172.20.2.0/28  prefix
> 
> The form you are showing is found on some systems, for example in 
> the output from `ip address show` on Linux systems, but it is a 
> commonly understood form.  Look further at the library that I 
> recommended last week, and I think you will find a solution.
> 
>> while not ipaddress.ip_network untrust_ip_address:
>>          untrust_ip_address = raw_input('\nEnter the  untrust IP ''"Example 172.20.2.3/28"'':')
> 
> You might try using the ipaddress library in the following way:
> 
>>>> i = ipaddress.ip_interface(u'172.20.2.3/28')
>>>> i.ip
>  IPv4Address(u'172.20.2.3')
>>>> i.network
>  IPv4Network(u'172.20.2.0/28')
>>>> i.with_prefixlen
>  u'172.20.2.3/28'
> 
> Good luck,
> 
> -Martin
> 
> -- 
> Martin A. Brown
> http://linux-ip.net/