To show only running containers use the given command: To show all containers use the given command: To show the latest created container (includes all states) use the given command: To show n last created containers (includes all states) use the given command: To display total file sizes use the given command: The content presented above is from docker.com. In the new version of Docker, commands … Read more
Try That file only contains key value pairs where values are scalars. You can convert it to a dataframe with ser.to_frame(‘count’). You can also do something like this: Now data is a dictionary. You can pass it to a dataframe constructor like this:
Use this method Collections.sort(List,Comparator) . Implement a Comparator and pass it to Collections.sort(). Then use the Comparator as
Use a named tuple, which was added to the collections module in the standard library in Python 2.6. It’s also possible to use Raymond Hettinger’s named tuple recipe if you need to support Python 2.4. It’s nice for your basic example, but also covers a bunch of edge cases you might run into later as well. Your fragment above would … Read more
super() lets you avoid referring to the base class explicitly, which can be nice. But the main advantage comes with multiple inheritance, where all sorts of fun stuff can happen. See the standard docs on super if you haven’t already. Note that the syntax changed in Python 3.0: you can just say super().__init__() instead of super(ChildB, self).__init__() which IMO is quite a bit nicer. The … Read more
The standard library includes the ordered and the unordered map (std::map and std::unordered_map) containers. In an ordered map the elements are sorted by the key, insert and access is in O(log n). Usually the standard library internally uses red black trees for ordered maps. But this is just an implementation detail. In an unordered map insert and access is in … Read more
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