key-value | 易学教程

How to search if dictionary value contains certain string with Python

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问题 I have a dictionary with key-value pair. My value contains strings. How can I search if a specific string exists in the dictionary and return the key that correspond to the key that contains the value. Let's say I want to search if the string 'Mary' exists in the dictionary value and get the key that contains it. This is what I tried but obviously it doesn't work that way. #Just an example how the dictionary may look like myDict = {'age': ['12'], 'address': ['34 Main Street, 212 First Avenue'

Steps to create and edit a plist file in Xcode

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I want to add key pair values in plist . I dont know how to add the .plist file in XCode. Simply i want to add these details in .plist file named as " Mobile.plist ". Apple - iPhone,iPod,iPad Samsung - Galaxy Y, Galaxy R, Galaxy Z Nokia - Lumina LG - Lg1 ,Lg2, Lg3 I have tried the steps to create a new Mobile.plist file by using this link, http://iphoneincubator.com/blog/tutorial/how-to-create-an-iphone-preferences-file . But, i cant get it exactly. When i tried to use the steps from this link, the plist file always empty. I don't know how to add the key, values in plist. I have created one

How to loop through key/value object in Javascript? [duplicate]

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问题 This question already has answers here : For..In loops in JavaScript - key value pairs (15 answers) Closed 5 years ago . var user = {}; now I want to create a setUsers() method that takes a key/value pair object and initializes the user variable. setUsers = function(data) { // loop and init user } where data is like: 234: "john", 23421: "smith", .... 回答1: Beware of properties inherited from the object's prototype (which could happen if you're including any libraries on your page, such as

Reliable and efficient key--value database for Linux? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I need a fast, reliable and memory-efficient key--value database for Linux. My keys are about 128 bytes, and the maximum value size can be 128K or 256K. The database subsystem shouldn't use more than about 1 MB of RAM. The total database size is 20G (!), but only a small random fraction of the data is accessed

How to push both key and value into an Array in Jquery

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问题 I am reading RSS feed and pushing both Title and Link into an Array in Jquery . What i did is var arr = []; $.getJSON("displayjson.php",function(data){ $.each(data.news, function(i,news){ var title = news.title; var link = news.link; arr.push({title : link}); }); }); And i am reading that array again using $('#show').click(function(){ $.each(arr, function(index, value){ alert( index +' : '+value); }); }); But it Giving me Output as 1:[Object Object] 2:[Object Object] 3:[Object Object] like

What is the difference between a map and a dictionary?

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问题 I know a map is a data structure that maps keys to values. Isn't a dictionary the same? What is the difference between a map and a dictionary 1 ? 1. I am not asking for how they are defined in language X or Y (which seems to be what generally people are asking here on SO), I want to know what is their difference in theory. 回答1: Two terms for the same thing: "Map" is used by Java, C++ "Dictionary" is used by .Net, Python "Associative array" is used by PHP "Map" is the correct mathematical term

Custom HashMap Code Issue

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问题 I have following code, where I used HashMap (using two parallel arrays) for storing key-value pairs (key can have multiple values). Now, I have to store and load it for future use that's why I store and load it by using File Channel. Issue with this code is: I can store nearly 120 millions of key-value pairs in my 8 GB server (actually, I can allocate nearly 5 gb out of 8 gb for my JVM, and those two parallel arrays takes nearly 2.5 gb, other memory are used for various processing of my code)

Need a MySQL query for selecting from a table storing key value pairs

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Why does the test_default_value_is_the_same_object in about_hashes.rb of Ruby Koans exercises have the answer of an array?

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问题 I'm doing the ruby koans exercises and am a bit confused about why the answers are such in the test_default_value_is_the_same_object method exercises. Below is the code: def test_default_value_is_the_same_object hash = Hash.new([]) hash[:one] << "uno" hash[:two] << "dos" assert_equal ["uno", "dos"], hash[:one] assert_equal ["uno", "dos"], hash[:two] assert_equal ["uno", "dos"], hash[:three] end I'm not sure why no matter what the key is, the value is always "uno" and "dos"? I thought when the

for each loop in Objective-C for accessing NSMutable dictionary

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I am finding some difficulty in accessing mutable dictionary keys and values in Objective-C. Suppose I have this: NSMutableDictionary *xyz=[[NSMutableDictionary alloc] init]; I can set keys and values. Now, I just want to access each key and value, but I don't know the number of keys set. In PHP it is very easy, something as follows: foreach ($xyz as $key => $value) How is it possible in Objective-C? zneak for (NSString* key in xyz) { id value = xyz[key]; // do stuff } This works for every class that conforms to the NSFastEnumeration protocol (available on 10.5+ and iOS), though NSDictionary