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()))
A list comprehension seems to be a good way to do this: >>> [mydict[x] for x in mykeys] [3, 1]
Differences KEY or INDEX refers to a normal non-unique index. Non-distinct values for the index are allowed, so the index may contain rows with identical values in all columns of the index. These indexes don’t enforce any restraints on your data so they are used only for access – for quickly reaching certain ranges of … Read more
You can use dict.get() value = d.get(key) which will return None if key is not in d. You can also provide a different default value that will be returned instead of None: value = d.get(key, “empty”)
With array_intersect_key and array_flip: var_dump(array_intersect_key($my_array, array_flip($allowed))); array(1) { [“foo”]=> int(1) }
In java you don’t check if a key is pressed, instead you listen to KeyEvents. The right way to achieve your goal is to register a KeyEventDispatcher, and implement it to maintain the state of the desired key: import java.awt.KeyEventDispatcher; import java.awt.KeyboardFocusManager; import java.awt.event.KeyEvent; public class IsKeyPressed { private static volatile boolean wPressed = false; … Read more
You need to use the LAST_INSERT_ID() function: http://dev.mysql.com/doc/refman/5.0/en/information-functions.html#function_last-insert-id Eg: INSERT INTO table_name (col1, col2,…) VALUES (‘val1’, ‘val2’…); SELECT LAST_INSERT_ID(); This will get you back the PRIMARY KEY value of the last row that you inserted: The ID that was generated is maintained in the server on a per-connection basis. This means that the value returned … Read more
It has been noted by many well respected developers such as Brian Goetz and Josh Bloch that : If an object’s hashCode() value can change based on its state, then we must be careful when using such objects as keys in hash-based collections to ensure that we don’t allow their state to change when they … Read more
To do this in any ES5-compatible environment, such as Node.js, Chrome, Internet Explorer 9+, Firefox 4+, or Safari 5+: Object.keys(obj).length Browser compatibility Object.keys documentation (includes a method you can add to non-ES5 browsers)
JavaScript: Object Rename Key