On Wed, 21 Sep 2016 04:04 am, Ganesh Pal wrote:
> I am on python 2.7 and Linux
>
> I have the stdout in the below form , I need to write a function to get
> hostname for the given id.
>
>
> Example:
>
>>>> stdout
> 'hostname-1 is array with id 1\nhostname-2 is array with id 2\nhostname-3
> is array with id 3\n'
>
>
> def get_hostname(id)
> return id
>
> what's a better option here
>
> 1. store it in list and grep for id and return
> 2. store it in dict as key and value i.e hostname = { 'hostname1': 1} and
> return key
> 3. any other simple options.
Why don't you write a function for each one, and see which is less work?
# Version 1: store the hostname information in a list as strings
hostnames = ['hostname-1 is array with id 1',
'hostname-2 is array with id 2',
'hostname-842 is array with id 842']
def get_hostname(id):
for line in hostnames:
regex = r'(.*) is array with id %d' % id
mo = re.match(regex, line)
if mo is not None:
return mo.group(1)
raise ValueError('not found')
# Version 2: store the hostname information in a dict {hostname: id}
hostnames = {'hostname1': 1, 'hostname2': 2, 'hostname842': 842}
def get_hostname(id):
for key, value in hostnames.items():
if value == id:
return key
raise ValueError('not found')
# Version 3: use a dict the way dicts are meant to be used
hostnames = {1: 'hostname1', 2: 'hostname2', 842: 'hostname842'}
def get_hostname(id):
return hostnames[id]
--
Steve
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