Great responses, thank you all very much. I read Jonathan Gardner's
solution first and investigated sets. It's clearly superior to my
first cut.
I love the comment about regular expressions. In perl, I've reached
for regexes WAY too much. That's a big lesson learned too, and from my
point of view not because of performance (although that's most likely
a bonus) but because of code readability.
Here's the version I have now. It looks quite similar to sjdevnull's.
Further comments appreciated, and thanks again.
#!/usr/bin/env python
import sys, fileinput, os
filename = '/etc/hosts'
hosts = []
search_terms = set(sys.argv[1:])
for line in open(filename, 'r'):
if line.startswith('#'): continue
try:
hostname = line.strip().split('\t')[2] # The
host I want is always
at the 3rd tab.
except IndexError:
continue
if hostname.startswith('float.') or
hostname.startswith('localhost.'):
continue
if search_terms <= set(hostname.split('.')): # same as if
search_terms.issubset(hostname.split('.')):
hosts.append(hostname)
if len(hosts) == 1:
os.execl("/usr/bin/ssh", '-A', hosts[0])
else:
for host in hosts:
print host
--
http://mail.python.org/mailman/listinfo/python-list
