you can easily add methods and attributes with Category through Objective-C Runtime,. his implementation principle is the object structure, objc_class contains the methodLists, is a secondary pointer, a pointer to the pointer. struct objc_method_l...
tested a list derivation that cannot be run in Python 3. Can Daniel give me an explanation? -sharp python2 matrix = [[1,2,3],[4,5,6],[7,8,9]] [x for row in matrix for x in row] -sharp [1, 2, 3, 4, 5, 6, 7, 8, 9] [x for x in row for row in matrix] -s...
the solution seen on the Internet has not worked. Ask God for advice ...
I think this module is good for building xml documents, but there is a problem with writing it as a file. 1 is missing the xml header declaration, 2 is not indented. For example, the minidom module is generated very well. How can you solve this problem? ...
node.js reported an error while installing the package gyp verb ensuring nodedir is created usr local web-blog node_modules node-sass .node-gyp 8.11.1 gyp verb command install [ 8.11.1 ] gyp verb install input version string "8.11.1 " gyp verb ...
problem description want to implement a recursion, but the foundation of js is poor, so I don t know how to implement it. related codes Please paste the code text below (do not replace the code with pictures) var array = [ { ...