How unset a lot of environment variables
unset takes multiple variables: unset HTTP_PROXY HTTPS_PROXY FTP_PROXY ALL_PROXY NO_PROXY
unset
delete all keys except one in dictionary
Why don’t you just create a new one? lang = {‘en’: lang[‘en’]} Edit: Benchmark between mine and jimifiki’s solution: $ python -m timeit “lang = {‘ar’:’arabic’, ‘ur’:’urdu’,’en’:’english’}; en_value = lang[‘en’]; lang.clear(); lang[‘en’] = en_value” 1000000 loops, best of 3: 0.369 usec per loop $ python -m timeit “lang = {‘ar’:’arabic’, ‘ur’:’urdu’,’en’:’english’}; lang = {‘en’: lang[‘en’]}” … Read more
How to unset multiple variables? [duplicate]
try this unset($foo1, $foo2, $foo3);
Unsetting array values in a foreach loop [duplicate]
foreach($images as $key => $image) { if(in_array($image, array( ‘http://i27.tinypic.com/29ykt1f.gif’, ‘http://img3.abload.de/img/10nxjl0fhco.gif’, ‘http://i42.tinypic.com/9pp2tx.gif’, )) { unset($images[$key]); } }
Unset readonly variable in bash
Actually, you can unset a readonly variable. but I must warn that this is a hacky method. Adding this answer, only as information, not as a recommendation. Use it at your own risk. Tested on ubuntu 13.04, bash 4.2.45. This method involves knowing a bit of bash source code & it’s inherited from this answer. … Read more
How to delete object from array inside foreach loop?
foreach($array as $elementKey => $element) { foreach($element as $valueKey => $value) { if($valueKey == ‘id’ && $value == ‘searched_value’){ //delete this particular object from the $array unset($array[$elementKey]); } } }
How can I unset a JavaScript variable?
The delete operator removes a property from an object. It cannot remove a variable. So the answer to the question depends on how the global variable or property is defined. (1) If it is created with var, it cannot be deleted. For example: var g_a = 1; //create with var, g_a is a variable delete … Read more
How do I delete an exported environment variable?
unset is the command you’re looking for. unset GNUPLOT_DRIVER_DIR
How can I remove a key from a Python dictionary?
To delete a key regardless of whether it is in the dictionary, use the two-argument form of dict.pop(): my_dict.pop(‘key’, None) This will return my_dict[key] if key exists in the dictionary, and None otherwise. If the second parameter is not specified (i.e. my_dict.pop(‘key’)) and key does not exist, a KeyError is raised. To delete a key … Read more