extract

This question already has an answer here: Access a particular field in arbitrarily nested JSON data [duplicate] 3 answers I have been trying to extract only certain data from a JSON file. I managed to decode the JSON and get the wanted data into a python dict. When I print out the dict it shows all the wanted data, but when I try to write the dict into a new file, only the last object gets written. One thing that I can't understand is also why when I print the dict I get multiple dicts objects instead of 1 as I would expect. My code: import json input_file=open('json.json', 'r') output_file

I'd like to extract thumbnail image from jpegs, without any external library. I mean this is not too difficult, because I need to know where the thumbnail starts, and ends in the file, and simply cut it. I study many documentation ( ie.: http://www.media.mit.edu/pia/Research/deepview/exif.html ), and try to analyze jpegs, but not everything clear. I tried to track step by step the bytes, but in the deep I confused. Is there any good documentation, or readable source code to extract the info about thumbnail start and end position within a jpeg file? Thank you! BitBank For most JPEG images

I'm trying to create a C# application which allows me to extract just the audio from YouTube videos. I've come across sites that already do that, but I'm not sure how they actually work. What would be the best way to do this programmatically? Thanks for any advice Writing an application for this might be overkill. Existing tools already do a pretty good job, and it's hard to beat their simplicity: wget http://www.youtube.com/get_video.php?video_id=... | ffmpeg -i - audio.mp3 All done! If your application needs to do something special with the audio afterwards, it would make sense to write an

I would like to get just the folder path from the full path to a file. For example T:\Data\DBDesign\DBDesign_93_v141b.mdb and I would like to get just T:\Data\DBDesign (excluding the \DBDesign_93_v141b.mdb ). I have tried something like this: existGDBPath = r'T:\Data\DBDesign\DBDesign_93_v141b.mdb' wkspFldr = str(existGDBPath.split('\\')[0:-1]) print wkspFldr but it gave me a result like this: ['T:', 'Data', 'DBDesign'] which is not the result that I require (being T:\Data\DBDesign ). Any ideas on how I can get the the path to my file? Sukrit Kalra You were almost there with your use of the

I have a nested list like so: smth <- list() smth$a <- list(a1=1, a2=2, a3=3) smth$b <- list(b1=4, b2=5, b3=6) smth$c <- "C" The names of every element in the list are unique. I would like to get an element from such a list merely by name without knowing where it is located. Example: getByName(smth, "c") = "C" getByName(smth, "b2") = 5 Also I don't really want to use unlist since the real list has a lot of heavy elements in it. The best solution so far is the following: rmatch <- function(x, name) { pos <- match(name, names(x)) if (!is.na(pos)) return(x[[pos]]) for (el in x) { if (class(el) ==

I'd like to extract the numbers from the following string via javascript/jquery: "ch2sl4" problem is that the string could also look like this: "ch10sl4" or this "ch2sl10" I'd like to store the 2 numbers in 2 variables. Is there any way to use match so it extracts the numbers before and after "sl" ? Would match even be the correct function to do the extraction? Thx Yes, match is the way to go: var matches = str.match(/(\d+)sl(\d+)/); var number1 = Number(matches[1]); var number2 = Number(matches[2]); If the string is always going to look like this: "ch[num1]sl[num2]" , you can easily get the