Python 3.6 - is there a condition that can behave like otherwise? -


my example (list , b same size):

a = ['12','12','12','12','12','23','24','24','31','31'] b = ['1','2','2','2','2','2','5','5','5','5'] c = a, b

here code needs otherwise condition, c[0] code looks through list rather both lists , prints out result of list , b fit condition. the else condition in code wrong , cant think of alternative:

d = list(zip(*[(ai,bi) ai, bi in zip(a,b) if c[0].count(ai) == 5 else 2]))  e = list(zip(*[(ai,bi) ai, bi in zip(a,b) if c[0].count(ai) == 7 else 2]))

is possible change condition prints counts of 5 if there more 2 counts in example? or prints counts of 2 if 7 initial count there none detected?

my desired outcome:

d = [('12','12','12','12','12',), ('1','2','2','2','2')]  e = [('24','24','31','31'), ('5','5','5','5')]

thank you!

you need count elements first, decide ones selecting. use collections.counter() object count elements efficiently, can decide elements picked:

from collections import counter  counts = counter(a) has_5 = any(c == 5 c in counts.values()) has_7 = any(c == 7 c in counts.values())

now know if there element appears 5 times, , if there element appears 7 times. can filter elements how many times appear, without re-counting each iteration. make pick first, don't have complicate if logic:

desired_count = 5 if has_5 else 2 d = list(zip(*[(ai,bi) ai, bi in zip(a,b) if counts[ai] == desired_count]))  desired_count = 7 if has_7 else 2 e = list(zip(*[(ai,bi) ai, bi in zip(a,b) if counts[ai] == desired_count]))

so if there element appears 5 times, filter on those, otherwise filter on elements appear twice.

demo:

>>> collections import counter >>> = ['12','12','12','12','12','23','24','24','31','31'] >>> b = ['1','2','2','2','2','2','5','5','5','5'] >>> counts = counter(a) >>> has_5 = any(c == 5 c in counts.values()) >>> has_7 = any(c == 7 c in counts.values()) >>> desired_count = 5 if has_5 else 2 >>> list(zip(*[(ai,bi) ai, bi in zip(a,b) if counts[ai] == desired_count])) [('12', '12', '12', '12', '12'), ('1', '2', '2', '2', '2')] >>> desired_count = 7 if has_7 else 2 >>> list(zip(*[(ai,bi) ai, bi in zip(a,b) if counts[ai] == desired_count])) [('24', '24', '31', '31'), ('5', '5', '5', '5')]

Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer
Read more

jquery - Responsive Navbar with Sub Navbar -

good day, forgive me nav vocabulary not best. if question confusing apologize. i'm working on navigation bar needs centered on page @ 768px , above. items in nav open (or perhaps toggle) subnav lives directly below. these nav should appear centered on page. i have been able work through responsive portion of nav bar, having main items align vertically , sub nav menu of each item roll out below, , gave them indent separation. working well. however, issue not responsive side, behavior @ width greater 768px. happens toggling menu's sub navigation pushes other main items down page below sub nav. here's code: $(document).ready(function () { //stick in fixed 100% height behind navbar don't wrap $('#slide-nav.navbar-inverse').after($('<div class="inverse" id="navbar-height-col"></div>')); $('#slide-nav.navbar-default').after($('<div id="navbar-height-col"></d
Read more