pattern matching with multiple lists
Greetings, I have some code that I wrote and know there is a better way to write it. I wonder if anyone could point me in the right direction on making this 'cleaner'. I have two lists: liveHostList = [ app11, app12, web11, web12, host11 ] stageHostList = [ web21, web22, host21, app21, app22 ] I need to pair the elements in the list such that: app11 pairs with app21 app12 pairs with app22 web11 pairs with web21 web12 pairs with web22 host11pairs with host21 each time I get the list I don't know the order, and the lists will grow over time. (hosts will be added in pairs. app13 to liveHostList and app23 to stageHostList, etc) Anyways this is what I have. I think it can be written better with map, but not sure. Any help would be appreciated. import re for liveHost in liveHostlist: nameList = list(liveHost) clone = nameList[-1] di = nameList[-2] generic = liveHost[:-2] for stageHost in stageHostList: if re.match( generic + '.' + clone, stageHost ): print Got a pair: + stageHost + liveHost Thanks again for any suggestions, Chad -- A grasshopper walks into a bar and the bartender says Hey, we have a drink named after you. And the grasshopper says Really, You have a drink named Murray? -- http://mail.python.org/mailman/listinfo/python-list
unique values of a Dictionary list (removing duplicate elements of a list)
Python users,
I am parsing an AIX trace file and creating a dictionary containing
keys (PIDS) and values (a list of TIDS). With PIDS being unique process ids
and TIDS, being a list of thread ids. My function populates the keys so
that they are unique, but my list contains duplicates.
Can someone point me in the right direction so that my dictionary value
does not contain duplicate elements?
here is what I got.
--portion of code that is relevant--
pidtids = {}
# --- function to add pid and tid to a dictionary
def addpidtids(pid,tid):
pidtids.setdefault(pid,[]).append(tid)
# --- function to parse a file
def grep(pattern, fileObj, include_line_nums=False):
r=[]
compgrep = re.compile(pattern)
for line_num, line in enumerate(fileObj):
if compgrep.search(line):
info = line.split()
p = info[7].lstrip(pid=)
t = info[8].lstrip(tid=)
addpidtids(p,t)
# process trace.int
tf = open(tracefile, 'r')
grep(cmd=java pid,tf)
tf.close()
--/portion of code that is relevant--
Any help would be greatly appreciated.
Thanks,
Chad
--
A grasshopper walks into a bar and the bartender says Hey, we have a drink
named after you. And the grasshopper says Really, You have a drink named
Murray?
--
http://mail.python.org/mailman/listinfo/python-list
Re: unique values of a Dictionary list (removing duplicate elements of a list)
On Fri, May 21, 2010 at 7:50 AM, Peter Otten __pete...@web.de wrote:
Chad Kellerman wrote:
Python users,
I am parsing an AIX trace file and creating a dictionary containing
keys (PIDS) and values (a list of TIDS). With PIDS being unique process
ids
and TIDS, being a list of thread ids. My function populates the keys so
that they are unique, but my list contains duplicates.
Can someone point me in the right direction so that my dictionary
value
does not contain duplicate elements?
here is what I got.
--portion of code that is relevant--
pidtids = {}
# --- function to add pid and tid to a dictionary
def addpidtids(pid,tid):
pidtids.setdefault(pid,[]).append(tid)
Use a set instead of a list (and maybe a defaultdict):
from collections import defaultdict
pidtids = defaultdict(set)
def addpidtids(pid, tid):
pidtids[pid].add(tid)
Peter
Thanks. I guess I should have posted this in my original question.
I'm on 2.4.3 looks like defautldict is new in 2.5.
I'll see if I can upgrade.
Thanks again.
--
http://mail.python.org/mailman/listinfo/python-list
--
A grasshopper walks into a bar and the bartender says Hey, we have a drink
named after you. And the grasshopper says Really, You have a drink named
Murray?
--
http://mail.python.org/mailman/listinfo/python-list
Re: unique values of a Dictionary list (removing duplicate elements of a list)
On Fri, May 21, 2010 at 8:07 AM, Chad Kellerman sunck...@gmail.com wrote:
On Fri, May 21, 2010 at 7:50 AM, Peter Otten __pete...@web.de wrote:
Chad Kellerman wrote:
Python users,
I am parsing an AIX trace file and creating a dictionary
containing
keys (PIDS) and values (a list of TIDS). With PIDS being unique process
ids
and TIDS, being a list of thread ids. My function populates the keys so
that they are unique, but my list contains duplicates.
Can someone point me in the right direction so that my dictionary
value
does not contain duplicate elements?
here is what I got.
--portion of code that is relevant--
pidtids = {}
# --- function to add pid and tid to a dictionary
def addpidtids(pid,tid):
pidtids.setdefault(pid,[]).append(tid)
Use a set instead of a list (and maybe a defaultdict):
from collections import defaultdict
pidtids = defaultdict(set)
def addpidtids(pid, tid):
pidtids[pid].add(tid)
Peter
Thanks. I guess I should have posted this in my original question.
I'm on 2.4.3 looks like defautldict is new in 2.5.
I'll see if I can upgrade.
Thanks again.
instead of upgrading.. (probably be faster to use techniques in available
2.4.3)
Couldn't I check to see if the pid exists (has_key I believe) and then check
if the tid is a value, in the the list for that key, prior to passing it to
the function?
Or would that be too 'expensive'?
--
http://mail.python.org/mailman/listinfo/python-list
--
A grasshopper walks into a bar and the bartender says Hey, we have a drink
named after you. And the grasshopper says Really, You have a drink named
Murray?
--
A grasshopper walks into a bar and the bartender says Hey, we have a drink
named after you. And the grasshopper says Really, You have a drink named
Murray?
--
http://mail.python.org/mailman/listinfo/python-list
