memory - creating different objects or the same depending on the type(basic python) -

-

इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 5 जवाब

मैंने पढ़ा है कि कैसे अजगर ऑब्जेक्ट बनाता है और उन लोगों के लिए "टैग" डालता है जो उस आवंटित चर के रूप में होते हैं। हालांकि, मुझे लगता है कि अगर दो स्ट्रिंग या पूर्णांक समान मूल्यों के साथ हैं, तो यह केवल एक मेमोरी स्थान को आवंटित करता है, सूचियों, ट्यूपल्स, डीआईसीएस के विपरीत। क्या कोई नियम या प्रकार की सूची होती है जब एक मामला होता है लेकिन दूसरा नहीं? विशेष रूप से, अगर मैं 

 > gt; & gt; & gt; एक्स, वाई = 'ए', 'ए' & gt; & gt; & gt; एक्स है y सत्य है & gt; & gt; X, y = 1,1> gt; & gt; & gt; एक्स सच है

लेकिन दूसरी ओर, अगर मैं करता हूं 

 > gt; & gt; X, y = {'a': 1}, {'a': 1}> & gt; & gt; X है y झूठी और gt; & gt; & gt; X, y = (1,), (1,) & gt; & gt; & gt; X है y झूठी और gt; & gt; & gt; X, y = [1], [1]> gt; & gt; & gt; पायथन में स्ट्रिंग्स अपरिवर्तनीय हैं और पुन: उपयोग किए जा रहे हैं। X, y


Comments

Post a Comment

Popular posts from this blog

mysql - How to enter php data into a html multiple select box -

-
I am working on a page that will create a team. I just want to create a selection box which will list all the users of all the users. After that, the user can select more than one friend (i.e. 5) and can send the request to these 5 people to join the team but I am having problems I did this: Select $ sql = "Select i. *, Join * Connect with M * m.id = i.clique_id where adder_id =: id"; $ Stmt = $ db- & gt; Query ($ sql, array ('id' = & gt; $ _SESSION ['id'])); While ($ record = $ stmt-> fetch ()) {$ surname = $ record ['surname']; } and this: & lt; Select multiple = "true" name = "category" well id = "category" name = "category" category = "" & gt; & Lt; Option value = "& lt ;? php echo $ surname ;? & gt;" & Gt; & Lt ;? Php ek $ nickname; ? & Gt; & Lt; / Options & gt; & Lt; / Select & gt; But only a friend's nickname...
Read more

java - Can't add JTree to JPanel of a JInternalFrame -

-
Image
There are two panels in my JInternalframe. I want to add TopPanel to Jtree to nominate another. But I can not add Jaitari to the top of the panel. Please help me in this piece of code: DefaultMutableTreeNode root = new DefaultMutableTreeNode ("deck"); DefaultMutableTreeNode Item Clubs = New DefaultMutableTreeNode ("Club"); AddAllCard (itemClubs); Root.add (itemClubs); DefaultMutableTreeNode item = New DefaultMutableTreeNode ("Diamonds"); AddAllCard (itemDiamonds); Root.add (itemDiamonds); DefaultMutableTreeNode Itemspads = New DefaultMutableTreeNode ("Spades"); AddAllCard (itemSpades); Root.add (itemSpades); DefaultMutableTreeNode item increases = new DefaultMutableTreeNode ("heart"); AddAllCard (itemHearts); Root.add (itemHearts); Default Trimodel Tree Model = New DefaultTreeModel (Route); Tree = new jetty (tree modal); ScrollPane = new JScrollPane (tree); // scrollPane.setViewportView (tree); . ScrollPane.getViewport () add (tr...
Read more

c++ - Cassandra datastax cpp driver - avoiding unnecessary copies -

-
I use the following method to create my insert statement for Cassandra (using datastax cpp driver) : ssStmt1 & lt; & Lt; "Insert some table (...) value (....)" string sStatement1 = ssStmt1.str (); Castestring cass1 = cass_string_init (sStatement1.c_str ()); CassStatement * pStmt1 = cass_statement_new (cass1, 0); I have also tried the following: CassString cass1 = cass_string_init ("Enter some table (id, date, c) value (? ,?,?); "); CassStatement * pStmt1 = cass_statement_new (cass1, 3); Cass_statement_bind_uuid (pStmt1, 0, uuidKey); Cass_statement_bind_int64 (PSTMT1, 1, timestamp); Cass_statement_bind_string (pStmt1, 2, sSomething); The first pattern works with mixed keys, the second is not. The key has a timestamp and a UUID. Timestamp is one of two errors in the field (based on the used bond statement). If bound in this way: cass_statement_bind_int64_by_name (pStmt1, "date", timestamp); I get the following error: Inva...
Read more