Python working with hostnames, hostname to IP

Question

In python I need to get IP from hostname:

socket.gethostbyname('www.python.org') # returns ip good
socket.gethostbyname('http://python.org') # raises error

I need to deal with hostnames starting with 'http://' so I figured out a way to remake them like this:

a = 'http://python.org'
a.replace('http://', 'www.')
print a # Why does it print http://python.org ???

I'm not sure I do the right thing. Plz help me with translating this type of hostname to IP

Also your idea is wrong, you should replace http:// with an empty string. www.python.org might point to a different IP than python.org. — user3072164
– user3072164, Commented Jan 2, 2014 at 10:01
sry, my fault in this example. in code it's really a. But still not working — user3057314
– user3057314, Commented Jan 2, 2014 at 10:01

bruno desthuilliers · Accepted Answer · 2014-01-02 10:01:33Z

7

You want urlparse:

>>> import urlparse
>>> urlparse.urlparse('http://python.org')
ParseResult(scheme='http', netloc='python.org', path='', params='', query='', fragment='')
>>> urlparse.urlparse('http://python.org').netloc
'python.org'
>>>

Oh, and yes, you don't need to add any "www" in front of the top-level domain.

answered Jan 2, 2014 at 10:01

bruno desthuilliers

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Buddhima Gamlath · Accepted Answer · 2014-01-02 10:01:59Z

1

You should do it like this,

a = 'http://python.org'
a = a.replace('http://', 'www.')  
# a.replace() does not change the original string. it returns a new string (replaced version).
print a

answered Jan 2, 2014 at 10:01

Buddhima Gamlath

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Comments

luk32 · Accepted Answer · 2014-01-02 10:03:38Z

-1

You have several problems.

1st. Error is raised, because http://stuff is not a valid domain. It is natural to expect an error.

2nd. b does not exists in the context you provided.

3rd. It is a dangerous thing to swap http:// for www. blindly. python.org and www.python.org are two different domains and they may point to different places!

You should use regular expressions or some other routines to extract the domain name from an URL, and use gethostbyname on it.

answered Jan 2, 2014 at 10:03

luk32

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