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Cron and virtualenv
...e /path/to/virtualenv/bin/activate && /path/to/build/manage.py some_command > /dev/null
It's tricky to spot why this fails as /var/log/syslog doesn't log the error details. Best to alias yourself to root so you get emailed with any cron errors. Simply add yourself to /etc/aliases and ...
Using NSPredicate to filter an NSArray based on NSDictionary keys
...ue3"], ["key3": "value4"]]
let dictPredicate = NSPredicate(block: { (obj, _) in
guard let dict = obj as? [String: String], let value = dict["key1"] else { return false }
return value == "value1"
})
let filteredArray = array.filter(dictPredicate.evaluate)
print(filteredArray) // prints: [["...
JavaScript for…in vs for
... There's always documentcloud.github.com/underscore which has _.each and a whole lot of other useful functions
– w00t
Nov 29 '11 at 11:01
...
delete map[key] in go?
...sions = map[string] chan int{};
sessions["moo"] = make (chan int);
_, ok := sessions["moo"];
if ok {
delete(sessions, "moo");
}
}
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How do I get the current username in Windows PowerShell?
...of the user running the PowerShell instance)
$(Get-WMIObject -class Win32_ComputerSystem | select username).username -- @TwonOfAn on this other forum
Comparison
@Kevin Panko's comment on @Mark Seemann's answer deals with choosing one of the categories over the other:
[The Windows access t...
Select 50 items from list at random to write to file
...an just take the first 50.
Otherwise, use
import random
random.sample(the_list, 50)
random.sample help text:
sample(self, population, k) method of random.Random instance
Chooses k unique random elements from a population sequence.
Returns a new list containing elements from the populat...
How to get std::vector pointer to the raw data?
...I didn't see that ugly &*iterator :P
– underscore_d
Nov 17 '15 at 13:53
2
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MySQL: #126 - Incorrect key file for table
...
you can set tmpdir=/mysql_tmp or something in the my.cnf and it should be on the root filesystem (however big that is)
– Kevin Parker
Jan 2 '15 at 22:24
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How to split a sequence into two pieces by predicate?
...
One can shorten the function inside partition to _ % 2 == 0.
– k0pernikus
Aug 21 '19 at 14:11
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How to check whether an array is empty using PHP?
... if the variable might not have been set AND you don't wont to trigger an E_NOTICE; IMO this is generally a bad idea.
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