On Aug 30, 10:38 pm, Tobias Weber <t...@gmx.net> wrote: > Hi, > whenever I type an "object literal" I'm unsure what optimisation will do > to it. > > def m(arg): > if arg & set([1,2,3]): > return 4 > > Is the set created every time the method is called? What about a > frozenset? Or tuple vs list? After how many calls per second does it pay > to save it at the module level? Would anybody else find this ugly? > > Also I never profiled the regular expression cache... > > -- > Tobias Weber
I test time creation of any types ang get next result: dictionary = 393 000 * 10 frozenset = 267 000 * 10 list = 519 000 * 10 set = 268 000 * 10 tuple = 5 935 500 * 10 global assign = 5 882 700 * 10 All results multiple by 10 becouse i do 10 creations in one loop and count loops per second. As you see create global variable is more faster (20 times) then create list and from it create set! Assigments is ~ 5 882 000*10,>>> set creation is 268 000*10 My test system is Ubuntu 10.04, Dell Inspiron 1525, Core2Duo, T8300, 2Gb , Python 2.6.5 (r265:79063, Apr 16 2010, 13:09:56) [GCC 4.4.3]. I make tests with XPyLIB.timetest module. (XPyLIB hosted at sourceforge - http://sourceforge.net/apps/trac/xpylib/wiki/CookBook/TimeTest) Assign global (pre declared by "global") function is next (N - is a times of repeating): gset = set((1,2,3)) def t_set_assign_global(ntimes = N, funcloop=u'funcloop', excludecall=u'excludecall'): """Set assigment from global : global=(1,2,3); loop a = global 10 times in while. @UID@ e710b888-bacd-4248-9ff7-1f7a348e1c8f @author@ Mazhugin Aleksey @score_common@ 1 """ a = 0 global gset while ntimes > 0: a = gset a = gset a = gset a = gset a = gset a = gset a = gset a = gset a = gset a = gset ntimes -= 1 Set function is next: def t_set_create(ntimes = N, funcloop=u'funcloop', excludecall=u'excludecall'): """Set creation : t=(1,2,3); loop a = set(t) 10 times in while. @UID@ a021a756-f9a5-44ec-b9e6-e5532b56c09f @author@ Mazhugin Aleksey @score_common@ 1 """ a = 0 t = (1,2,3) while ntimes > 0: a = set(t) a = set(t) a = set(t) a = set(t) a = set(t) a = set(t) a = set(t) a = set(t) a = set(t) a = set(t) ntimes -= 1 Also i test regular expression compiled pattern vs non-compiled: compiled = 343 000*2 not compiled = 164 000*2 Functions is next: patt5 = u'*.tmp,*.pyc,*.pyo,*.bak,*.log' path1 = u'/home/user/project/src/file.ext' path2 = u'/home/user/project/logs/debug.log' def t_rematch(ntimes=10, funcloop=u'funcloop', excludecall='excludecall'): """ Compiled. @UID@ 665f4014-9c11-4668-baae-e49230027bd4 @author@ Mazhugin Aleksey @score_common@ 1 """ ci = patt5.replace(u'\\',u'\\\\').replace(u'|',u'\ \|').replace(u'.',u'\\.').replace(u'*',u'.*'). \ replace(u'?',u'.?').replace(u'$',u'\\$').replace(u'^',u'\ \^').replace(u'{',u'\\{'). \ replace(u'(',u'\\(').replace(u'[',u'\\[').replace(u'+',u'\\ +').split(u',') repat = u'|'.join([u'('+i+u'$)' for i in ci]) rec = re.compile(repat) r = 0 while ntimes: r = rec.match(path1) is not None r = rec.match(path2) is not None ntimes -= 1 def t_rematch_string(ntimes=10, funcloop=u'funcloop', excludecall='excludecall'): """ Not compiled. @UID@ 80fa1ca3-5d51-4f6e-8ac2-4ccafe4c1160 @author@ Mazhugin Aleksey @score_common@ 1 """ ci = patt5.replace(u'\\',u'\\\\').replace(u'|',u'\ \|').replace(u'.',u'\\.').replace(u'*',u'.*'). \ replace(u'?',u'.?').replace(u'$',u'\\$').replace(u'^',u'\ \^').replace(u'{',u'\\{'). \ replace(u'(',u'\\(').replace(u'[',u'\\[').replace(u'+',u'\\ +').split(u',') repat = u'|'.join([u'('+i+u'$)' for i in ci]) #rec = re.compile(repat) r = 0 while ntimes: r = re.match(repat, path1) is not None r = re.match(repat, path2) is not None ntimes -= 1 -- http://mail.python.org/mailman/listinfo/python-list
