Sorting a list of lists in Python - 


  c2 = [] पंक्ति 1 = [1,22,53] पंक्ति 2 = [14,25,46] row3 = [7,8,9] c2.append (row2) c2.append (row1) c2.append (row3)

c2 अब है: <

  [[14, 25, 46], [1, 22, 53], [7, 8, 9]]

मैं कैसे सी 2 इस तरह से कि उदाहरण के लिए: 

  पंक्ति के लिए सी 2 में: पंक्ति पर पंक्तिबद्ध [2]

परिणाम होगा : 

  [[7,8,9], [14,25,46], [1,22,53]]

दूसरा प्रश्न यह है कि मैं पहली बार पंक्ति [2] के अनुसार कैसे और पंक्ति में [1]

द्वारा निर्धारित किया गया है प्रत्येक तर्क तत्व से एक तुलना कुंजी निकालने के लिए उपयोग किया जाता है एक तर्क का एक कार्य तो हम एक सरल लैम्ब्डा बना सकते हैं जो कि प्रत्येक पंक्ति से अंतिम पंक्ति को वापस क्रम में उपयोग करने के लिए देता है: 

  c2.sort (key = lambda row: row [ 2])

जब आप इस तरह एक साधारण एकल उपयोग समारोह बनाना चाहते हैं तो यह आसान है। बराबर कोड लैम्ब्डा का उपयोग नहीं करेगा: 

  def sort_key (पंक्ति): वापसी पंक्ति [2] c2.sort (key = sort_key)

यदि आप अधिक प्रविष्टियों को सॉर्ट करना चाहते हैं, तो बस key फ़ंक्शन को एक महत्वपूर्ण दर्जा युक्त क्रम में एक ट्यूपल वापस लौटाएं। उदाहरण के लिए: 

  c2.sort (कुंजी = लैम्ब्डा पंक्ति: (पंक्ति [2], पंक्ति [1]))

या: 

  c2.sort (कुंजी = लैम्ब्डा पंक्ति: (पंक्ति [2], पंक्ति [1], पंक्ति [0]))

-

Comments

Post a Comment

Popular posts from this blog

google indexing -

I have a question, how can I get results of similar Google results like Wikipedia, MySpace ... When you search Wikipedia on Google, you have the result of an input search for Wikipedia, which is user-friendly. When you search MySpace on Google, you have Google results below, some links: login, register, sign up, search ... I actually do this on Google for my website Want a kind result? Thank you. itemprop = "text"> create a sitemap: Custom Search Engine Create: Thanks Google!
Read more

wpf - Converter stops filter working -

I'm trying to display the file name in a listbox, taken from a special directory. They are stored in an ObservableCollection of FileInfo Object: Public supervision & lt; FileInfo & gt; Project Files {Get (empty (selected folder == empty); DirectoryInfo D = New Directory Info (SelectedFolder); if (! D.Extists) returns empty; New Observe Collection & lt; FileInfo & gt; (d.EnumerateFiles ( Return "* .xsi")}}} When a text is entered or a text box has changed in "FilesFilterBy" I applied a filter on the listbox, called Is: Private Zero FilterFiles_TextChanged (Object Sender, TextChangedEventArgs e) {ICollectionView View = Archive Source.GetDefaultView (ProjectFiles); see.filters = new new & amp; object> (IsTextInFilename);} public bool isTextInFilename (object item) {string file name = path.GetFileNameWithoutExtension (as fileInfo) .Name item Returns (filename. ToLower (). Includes (File Byte Text. Taylor ());} At the same time,...
Read more

php - How to paginate multiple results in CakePHP? -

How can I use the Pageinization Assistant in KPHPH to set more than one result on the same page? They will do the page independently Edit: I have found a reason why it can not do this because because the page will get its URL from the assistant controller / verb and after that Finally add its parameters. If it pulls the URL from the address bar, it has its own unique variable and then a straw_rele is used to navigate to the next one if you have already placed the page, or if it is not present in it Now, I'm thinking of re-writing assistant to support this feature to support this feature, but I'm not sure if I need it or if they are already I support it and I am doing it wrong Here's my solution in your controller: function index () {// your default model is $ $ this- & gt; Set ('model1', $ this- & gt; paginated)); // Endorsement for Model 2- $ this- & gt; Set ('Model2', $ this- & gt; Paginated ('Model2')); } In your ...
Read more