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In Python, using argparse, allow only positive integers
... return ivalue
parser = argparse.ArgumentParser(...)
parser.add_argument('foo', type=check_positive)
This is basically just an adapted example from the perfect_square function in the docs on argparse.
share
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...
How to debug Ruby scripts [closed]
...ion path of your code while calling .inspect on the method or object (e.g. foo):
raise foo.inspect
In the above code, raise triggers an Exception that halts execution of your code, and returns an error message that conveniently contains .inspect information about the object/method (i.e. foo) on t...
Traits in PHP – any real world examples/best practices? [closed]
...)
{
$this->logger->log($message, $level);
}
}
class Foo implements Logger
{
use Loggable;
}
And then you do (demo)
$foo = new Foo;
$foo->setLogger(new DemoLogger);
$foo->log('It works', 1);
I guess the important thing to consider when using traits is that they r...
How do I save and restore multiple variables in python?
...; from klepto.archives import file_archive
>>> db = file_archive('foo.txt')
>>> db['1'] = 1
>>> db['max'] = max
>>> squared = lambda x: x**2
>>> db['squared'] = squared
>>> def add(x,y):
... return x+y
...
>>> db['add'] = add
>>...
Is there a simple, elegant way to define singletons? [duplicate]
...en have to use the Instance method. Here's an example:
@Singleton
class Foo:
def __init__(self):
print 'Foo created'
f = Foo() # Error, this isn't how you get the instance of a singleton
f = Foo.instance() # Good. Being explicit is in line with the Python Zen
g = Foo.instance() # Retu...
How to call any method asynchronously in c#
...to fire-and-forget for async jobs:
using System.Threading.Tasks;
...
void Foo(){}
...
new Task(Foo).Start();
If you have methods to call that take parameters, you can use a lambda to simplify the call without having to create delegates:
void Foo2(int x, string y)
{
return;
}
...
new Task(() ...
Real life example, when to use OUTER / CROSS APPLY in SQL
...g table structure....
CREATE TABLE T
(
Id INT PRIMARY KEY,
Foo1 INT, Foo2 INT, Foo3 INT,
Bar1 INT, Bar2 INT, Bar3 INT
);
Example using 2008+ VALUES syntax.
SELECT Id,
Foo,
Bar
FROM T
CROSS APPLY (VALUES(Foo1, Bar1),
(Foo2, B...
How to mkdir only if a directory does not already exist?
...
Try mkdir -p:
mkdir -p foo
Note that this will also create any intermediate directories that don't exist; for instance,
mkdir -p foo/bar/baz
will create directories foo, foo/bar, and foo/bar/baz if they don't exist.
Some implementation like G...
From Arraylist to Array
... If so, keep it an ArrayList. Else convert away!
ArrayList<Integer> foo = new ArrayList<Integer>();
foo.add(1);
foo.add(1);
foo.add(2);
foo.add(3);
foo.add(5);
Integer[] bar = foo.toArray(new Integer[foo.size()]);
System.out.println("bar.length = " + bar.length);
outputs
bar.length =...
Dynamic instantiation from string name of a class in dynamically imported module?
...
If you want this sentence from foo.bar import foo2 to be loaded dynamically, you should do this
foo = __import__("foo")
bar = getattr(foo,"bar")
foo2 = getattr(bar,"foo2")
instance = foo2()
...