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How to define hash tables in Bash?
...ecuting your script directly, or execute script with bash script. (Not actually executing a Bash script with Bash does happen, and will be really confusing!)
You declare an associative array by doing:
declare -A animals
You can fill it up with elements using the normal array assignment operator....
sqlalchemy IS NOT NULL select
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In case anyone else is wondering, you can use is_ to generate foo IS NULL:
>>> from sqlalchemy.sql import column
>>> print column('foo').is_(None)
foo IS NULL
>>> print column('foo').isnot(None)
foo IS NOT NULL
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Copy folder recursively, excluding some folders
...kHuginnsson - What systems are you using? Rsync is included by default in all mainstream Linux distros I know of, including RHEL, CentOS, Debian, and Ubuntu, and I believe it's in FreeBSD as well.
– siliconrockstar
Jan 30 '15 at 19:50
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Do regular expressions from the re module support word boundaries (\b)?
...use \b in a Python string is shorthand for a backspace character.
print("foo\bbar")
fobar
So the pattern "\btwo\b" is looking for a backspace, followed by two, followed by another backspace, which the string you're searching in (x = 'one two three') doesn't have.
To allow re.search (or compile)...
Should I pass a shared_ptr by reference? [duplicate]
...mber of bugs arise from improper lifetime management. What's worse conceptually is that it is never clear who owns the objects whose pointers the container stores. The pointers could even be a mix of pointers to dynamic objects, automatic objects, and garbage. Nobody can tell. So the standard soluti...
error: passing xxx as 'this' argument of xxx discards qualifiers
...w. I have a coworker who refers to me as the "const-able". 8v) Change that foo obj; to const foo obj; once and see what happens. Or pass a const reference to a foo.
– Fred Larson
May 12 '11 at 5:06
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Ruby: Easiest Way to Filter Hash Keys?
...ou have the keys in a separate list, you can use the * notation:
keys = [:foo, :bar]
hash1 = {foo: 1, bar:2, baz: 3}
hash2 = hash1.slice(*keys)
=> {foo: 1, bar:2}
As other answers stated, you can also use slice! to modify the hash in place (and return the erased key/values).
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glob exclude pattern
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Really interesting solution! But my case is going to be extremely slow to make a read twice. Also if the content of a folder is big on an network directory, is going to be slow again. But in any case, really handy.
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What is 'Pattern Matching' in functional languages?
...wesome.
Algebraic data types in a nutshell
ML-like functional languages allow you define simple data types called "disjoint unions" or "algebraic data types". These data structures are simple containers, and can be recursively defined. For example:
type 'a list =
| Nil
| Cons of 'a * 'a ...
AngularJS - Trigger when radio button is selected
...d many ng-xxxx kind of options but couldn't find the one..
I just want to call some function in the controller when radio button is selected.
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