How to store default value when nothing is found or whois fails to get results in python

Question

The code

import whois 
domains = ['google.com', 'stackoverflow.com', 'hdtrcs.com' , 'facebook.com' ]
w = []
i = 0
for data in domains:
    n = domains[i]
    print(n)
    i = i+1
    data = whois.whois(n)
    if data != None:
            w.append(data['domain_name'])
    else:
        w.append('none')
print (w)

Expected to store w = ['GOOGLE.COM', 'STACKOVERFLOW.COM', 'none', 'facebook.com' ]

The error is it cant find the domain and it stops checking next domains

The output this code gives

google.com
stackoverflow.com
hdtrcs.com
Traceback (most recent call last):
  File "who.py", line 9, in <module>
    data = whois.whois(n)
  File "/usr/local/lib/python3.5/dist-packages/whois/__init__.py", line 41, in whois
    return WhoisEntry.load(domain, text)
  File "/usr/local/lib/python3.5/dist-packages/whois/parser.py", line 185, in load
    return WhoisCom(domain, text)
  File "/usr/local/lib/python3.5/dist-packages/whois/parser.py", line 283, in __init__
    raise PywhoisError(text)
whois.parser.PywhoisError: No match for "HDTRCS.COM".
>>> Last update of whois database: 2018-03-16T09:41:06Z <<<

NOTICE: The expiration date displayed in this record is the date the
registrar's sponsorship of the domain name registration in the registry is
currently set to expire. This date does not necessarily reflect the expiration
date of the domain name registrant's agreement with the sponsoring
registrar.  Users may consult the sponsoring registrar's Whois database to
view the registrar's reported date of expiration for this registration.

TERMS OF USE: You are not authorized to access or query our Whois
database through the use of electronic processes that are high-volume and
automated except as reasonably necessary to register domain names or
modify existing registrations; the Data in VeriSign Global Registry
Services' ("VeriSign") Whois database is provided by VeriSign for
information purposes only, and to assist persons in obtaining information
about or related to a domain name registration record. VeriSign does not
guarantee its accuracy. By submitting a Whois query, you agree to abide
by the following terms of use: You agree that you may use this Data only
for lawful purposes and that under no circumstances will you use this Data
to: (1) allow, enable, or otherwise support the transmission of mass
unsolicited, commercial advertising or solicitations via e-mail, telephone,
or facsimile; or (2) enable high volume, automated, electronic processes
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The Registry database contains ONLY .COM, .NET, .EDU domains and
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How to get rid of this error or to add some default value like none and store it in the list and when this error arises or domain not found and continue to check for rest of the domains.

Patrick Mevzek · Accepted Answer · 2018-03-19T06:57:55.590

The library you use generates an exception (whois.parser.PywhoisError) when the domain name is not found.

Hence, you need to capture this exception and deal with it.

Replace the end of your loop by something like:

try:
    data = whois.whois(n)
    w.append(data['domain_name'])
except whois.parser.PywhoisError:
    w.append('none')

You may need an import whois.parser at top of your file, so that the exception is known (symbol resolved) in your program.

Rakesh · Answer 2 · 2020-12-18T12:01:35.293

1

You can use dict.get

Ex:

import whois 
domains = ['google.com', 'stackoverflow.com', 'hdtrcs.com' , 'facebook.com' ]
result = []
for dom in domains:
    w = whois.whois(dom)
    if w:
        result.append(w.get('domain_name', 'none'))    

print (result)

edited Dec 18 '20 at 12:01

answered Mar 16 '18 at 07:57

Rakesh

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error `Traceback (most recent call last): File "who.py", line 6, in w.append(w.get('domain_name', 'none')) TypeError: 'NoneType' object is not callable` – vipul-rao Mar 16 '18 at 08:09
@vipul-rao. Updated snippet can you try now? – Rakesh Mar 16 '18 at 08:13
same error rakesh `Traceback (most recent call last): File "who.py", line 7, in w.append(w.get('domain_name', 'none')) TypeError: 'NoneType' object is not callable` – vipul-rao Mar 16 '18 at 09:13
just look i have updated the code even this gives error – vipul-rao Mar 16 '18 at 09:43
`(w or {'domain_name': None}).get('domain_name', None)`. Pretty complex IMO. – Reut Sharabani Mar 16 '18 at 09:50
TypeError: 'NoneType' object is not callable – Itachi Sama Dec 18 '20 at 04:04

How to store default value when nothing is found or whois fails to get results in python

2 Answers2