One way would be: import random d = {‘VENEZUELA’:’CARACAS’, ‘CANADA’:’OTTAWA’} random.choice(list(d.values())) EDIT: The question was changed a couple years after the original post, and now asks for a pair, rather than a single item. The final line should now be: country, capital = random.choice(list(d.items()))
No. Any valid string is a valid key. It can even have ” as long as you escape it: {“The \”meaning\” of life”:42} There is perhaps a chance you’ll encounter difficulties loading such values into some languages, which try to associate keys with object field names. I don’t know of any such cases, however.
Run cat then press keys to see the codes your shortcut send. (Press Ctrl+C to kill the cat when you’re done.) For me, (ubuntu, konsole, xterm) pressing Alt+← sends ^[[1;3D, so i would put in my .zshrc bindkey “^[[1;3C” forward-word bindkey “^[[1;3D” backward-word (Actually I prefer to use Ctrl + arrow to move word by … Read more
You can use: jq ‘keys’ file.json Complete example $ cat file.json { “Archiver-Version” : “Plexus Archiver”, “Build-Id” : “”, “Build-Jdk” : “1.7.0_07”, “Build-Number” : “”, “Build-Tag” : “”, “Built-By” : “cporter”, “Created-By” : “Apache Maven”, “Implementation-Title” : “northstar”, “Implementation-Vendor-Id” : “com.test.testPack”, “Implementation-Version” : “testBox”, “Manifest-Version” : “1.0”, “appname” : “testApp”, “build-date” : “02-03-2014-13:41”, “version” : … Read more
You should iterate over keys with: for key in mydictionary: print “key: %s , value: %s” % (key, mydictionary[key])
For instance if you want to detect whether the “Enter”-key was clicked or not: Instead of event.keyCode === 13 Do it like event.key === ‘Enter’
There’s no difference. They are synonyms. From the CREATE TABLE manual entry: KEY is normally a synonym for INDEX. The key attribute PRIMARY KEY can also be specified as just KEY when given in a column definition. This was implemented for compatibility with other database systems.
A list comprehension seems to be a good way to do this: >>> [mydict[x] for x in mykeys] [3, 1]
The primary key is always indexed. This is the same for MyISAM and InnoDB, and is generally true for all storage engines that at all supports indices.
A dictionary has, by definition, an arbitrary number of keys. There is no “the key”. You have the keys() method, which gives you a python list of all the keys, and you have the iteritems() method, which returns key-value pairs, so for key, value in mydic.iteritems() : print key, value Python 3 version: for key, … Read more