Use std::string::find as follows: if (s1.find(s2) != std::string::npos) { std::cout … [Read more...]
Why does “pip install” inside Python raise a SyntaxError?
pip is run from the command line, not the Python interpreter. It is a program that installs modules, so you can use them from Python. Once you have installed the module, then you can open the Python shell and do import selenium. The Python shell is not a command line, it is an interactive interpreter. You type Python code into it, not commands. Use the command line, not the … [Read more...]
What does enctype=’multipart/form-data’ mean?
When you make a POST request, you have to encode the data that forms the body of the request in some way. HTML forms provide three methods of encoding. application/x-www-form-urlencoded (the default) multipart/form-data text/plain Work was being done on adding application/json, but that has been abandoned. (Other encodings are possible with HTTP requests generated using other … [Read more...]
application/x-www-form-urlencoded or multipart/form-data?
TL;DR Summary; if you have binary (non-alphanumeric) data (or a significantly sized payload) to transmit, use multipart/form-data. Otherwise, use application/x-www-form-urlencoded. The MIME types you mention are the two Content-Type headers for HTTP POST requests that user-agents (browsers) must support. The purpose of both of those types of requests is to send a list of … [Read more...]
Does Python have an ordered set?
There is an ordered set (possible new link) recipe for this which is referred to from the Python 2 Documentation. This runs on Py2.6 or later and 3.0 or later without any modifications. The interface is almost exactly the same as a normal set, except that initialisation should be done with a list. OrderedSet([1, 2, 3]) This is a MutableSet, so the signature for .union doesn't … [Read more...]
How to unmount a busy device
YES!! There is a way to detach a busy device immediately - even if it is busy and cannot be unmounted forcefully. You may cleanup all later: umount -l /PATH/OF/BUSY-DEVICE umount -f /PATH/OF/BUSY-NFS (NETWORK-FILE-SYSTEM) NOTE/CAUTION These commands can disrupt a running process, cause data loss OR corrupt open files. Programs accessing target DEVICE/NFS files may throw … [Read more...]
How do I revert a Git repository to a previous commit?
This depends a lot on what you mean by "revert". Temporarily switch to a different commit If you want to temporarily go back to it, fool around, then come back to where you are, all you have to do is check out the desired commit: # This will detach your HEAD, that is, leave you with no branch checked out: git checkout 0d1d7fc32 Or if you want to make commits while you're … [Read more...]
How can I create an array of linked lists in java?
LinkedList[] vertex = new LinkedList[5]; int i = 0, m = 6; while(i!=m){ int temp = sc.nextInt(); int temp2 = sc.nextInt(); // Make sure the list is initialized before adding to it if (vertex[temp] == null) { vertex[temp] = new LinkedList(); } vertex[temp].add(temp2); i++; } //initialize array LinkedList[] vertex = new LinkedList[5]; //initialize array … [Read more...]
Set cellpadding and cellspacing in CSS?
Basics For controlling "cellpadding" in CSS, you can simply use padding on table cells. E.g. for 10px of "cellpadding": td { padding: 10px; } For "cellspacing", you can apply the border-spacing CSS property to your table. E.g. for 10px of "cellspacing": table { border-spacing: 10px; border-collapse: separate; } This property will even allow separate horizontal … [Read more...]
When to use LinkedList over ArrayList in Java?
Summary ArrayList with ArrayDeque are preferable in many more use-cases than LinkedList. If you're not sure — just start with ArrayList. TLDR, in ArrayList accessing an element takes constant time [O(1)] and adding an element takes O(n) time [worst case]. In LinkedList adding an element takes O(n) time and accessing also takes O(n) time but LinkedList uses more memory than … [Read more...]