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Meaning of $? (dollar question mark) in shell scripts
...
echo $? # echoes 0
false
echo $? # echoes 1
From the manual: (acessible by calling man bash in your shell)
$? Expands to the exit status of the most recently executed foreground pipeline.
By convention an exit status of 0 means success, and non-zero return status means fa...
Can't install PIL after Mac OS X 10.9
... install pil
UPDATE:
But there is more correct solution below, provided by Will.
open your terminal and execute:
xcode-select --install
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Flatten an irregular list of lists
...In Python 3, the basestring is no more, but you can use a tuple of str and bytes to get the same effect there.
The yield from operator returns an item from a generator one at a time. This syntax for delegating to a subgenerator was added in 3.3
def flatten(l):
for el in l:
if isinstanc...
Android - Package Name convention
...for example, com.example.mypackage for a package named
mypackage created by a programmer at example.com.
Name collisions that occur within a single company need to be handled
by convention within that company, perhaps by including the region or
the project name after the company name (for...
Postgresql: password authentication failed for user “postgres”
...If I remember correctly the user postgres has no DB password set on Ubuntu by default. That means, that you can login to that account only by using the postgres OS user account.
Assuming, that you have root access on the box you can do:
sudo -u postgres psql
If that fails with a database "postgr...
How to render a DateTime object in a Twig template
... not honor the user locale, which should not be a problem with a site used by only users of one nationality. International users should display the game date totally different, like extending the \DateTime class, and adding a __toString() method to it that checks the locale and acts accordingly.
Ed...
Removing ul indentation with CSS
...
-webkit-padding-start: 0;
will remove padding added by webkit engine
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Using Mockito's generic “any()” method
...n use the argument-less any method and the type argument will get inferred by the compiler:
verify(bar).doStuff(any());
Explanation
The new thing in Java 8 is that the target type of an expression will be used to infer type parameters of its sub-expressions. Before Java 8 only arguments to met...
Difference between await and ContinueWith
...slightly complex, await leads to much simpler code. Additionally, as noted by Servy in comments, awaiting a task will "unwrap" aggregate exceptions which usually leads to simpler error handling. Also using await will implicitly schedule the continuation in the calling context (unless you use Configu...
Which cryptographic hash function should I choose?
...monly used as the SHA families, and so has not been scrutinized as closely by cryptographic researchers. For that reason alone I would recommend the use of SHA functions over it. In the implementation you are using it seems quite slow as well, which makes it less useful.
In conclusion, there is no ...