In simple words, a loop invariant is some predicate (condition) that holds for every iteration of the loop. For example, let’s look at a simple for loop that looks like this: In this example it is true (for every iteration) that i + j == 9. A weaker invariant that is also true is that i >= 0 && … Read more
Use the header() function to send an HTTP Location header: Contrary to what some think, die() has nothing to do with redirection. Use it only if you want to redirect instead of normal execution. File example.php: Result of three executions: Resuming — obligatory die()/exit() is some urban legend that has nothing to do with actual PHP. It has nothing to do with client “respecting” the Location: header. Sending a header does not … Read more
This error can mean that ./arm-mingw32ce-g++ doesn’t exist (but it does), or that it exists and is a dynamically linked executable recognized by the kernel but whose dynamic loader is not available. You can see what dynamic loader is required by running ldd /arm-mingw32ce-g++; anything marked not found is the dynamic loader or a library that you need to install. … Read more
The JSON is data only, and if you include a comment, then it will be data too. You could have a designated data element called “_comment” (or something) that should be ignored by apps that use the JSON data. You would probably be better having the comment in the processes that generates/receives the JSON, as they are … Read more
DataFrame.iterrows is a generator which yields both the index and row (as a Series):
The error message says that if you’re passing scalar values, you have to pass an index. So you can either not use scalar values for the columns — e.g. use a list: or use scalar values and pass an index:
There is no native map to the Object object, but how about this: Run code snippet But you could easily iterate over an object using for … in: Run code snippet Update A lot of people are mentioning that the previous methods do not return a new object, but rather operate on the object itself. For that matter I wanted … Read more
For Unix To delete all containers including its volumes use, To delete all the images, Remember, you should remove all the containers before removing all the images from which those containers were created. For Windows In case you are working on Windows (Powershell), Based on the comment from CodeSix, one liner for Windows Powershell, For … Read more
Bootstrap 5 In Bootstrap 5 (alpha) there is a new -xxl- size: col-* – 0 (xs)col-sm-* – 576pxcol-md-* – 768pxcol-lg-* – 992pxcol-xl-* – 1200pxcol-xxl-* – 1400px Bootstrap 5 Grid Demo Bootstrap 4 In Bootstrap 4 there is a new -xl- size, see this demo. Also the -xs- infix has been removed, so smallest columns are simply col-1, col-2.. col-12, etc.. col-* – 0 (xs)col-sm-* – 576pxcol-md-* – 768pxcol-lg-* – 992pxcol-xl-* – 1200px Bootstrap 4 Grid Demo Additionally, Bootstrap 4 includes … Read more
This answer is in three parts, see below for the official release (v3 and v4) I couldn’t even find the col-lg-push-x or pull classes in the original files for RC1 i downloaded, so check your bootstrap.css file. hopefully this is something they will sort out in RC2. anyways, the col-push-* and pull classes did exist … Read more