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Python constructor and default value [duplicate]
...opyright", "credits" or "license" for more information.
>>> class Foo:
... def __init__(self, x=[]):
... x.append(1)
...
>>> Foo.__init__.__defaults__
([],)
>>> f = Foo()
>>> Foo.__init__.__defaults__
([1],)
>>> f2 = Foo()
>>> Foo.__...
How to convert variable (object) name into String [duplicate]
I have the following data frame with variable name "foo" ;
1 Answer
1
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wget command to download a file and save as a different filename
...com
...
16:07:52 (538.47 MB/s) - `index.html' saved [10728]
vs.
wget -O foo.html google.com
...
16:08:00 (1.57 MB/s) - `foo.html' saved [10728]
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Is there a “goto” statement in bash?
...bitrary loops, most require that to be expressed statically -- e.g., break foo; will break out of the loop labeled foo -- whereas in Bash it's expressed dynamically -- e.g., break "$foo" will break out of $foo loops.)
– ruakh
Apr 28 '14 at 16:37
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When is -XAllowAmbiguousTypes appropriate?
...he other:
{-# LANGUAGE FlexibleInstances, OverlappingInstances #-}
class Foo a where
whichOne :: a -> String
instance Foo a where
whichOne _ = "a"
instance Foo [a] where
whichOne _ = "[a]"
-- |
-- >>> main
-- [a]
main :: IO ()
main = putStrLn $ whichOne (undefined :: [Int])
...
Assigning default values to shell variables with a single command in bash
...
Very close to what you posted, actually:
FOO=${VARIABLE:-default} # If variable not set or null, use default.
Or, which will assign default to VARIABLE as well:
FOO=${VARIABLE:=default} # If variable not set or null, set it to default.
...
What is the proper way to check for existence of variable in an EJS template (using ExpressJS)?
...
The same way you would do it with anything in js, typeof foo == 'undefined', or since "locals" is the name of the object containing them, you can do if (locals.foo). It's just raw js :p
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In R, how to get an object's name after it is sent to a function?
...
Note that for print methods the behavior can be different.
print.foo=function(x){ print(deparse(substitute(x))) }
test = list(a=1, b=2)
class(test)="foo"
#this shows "test" as expected
print(test)
#this (just typing 'test' on the R command line)
test
#shows
#"structure(list(a = 1, b = 2),...
jQuery - Create hidden form element on the fly
...r second question:
$('<input>').attr({
type: 'hidden',
id: 'foo',
name: 'bar'
}).appendTo('form');
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PHP Foreach Pass by Reference: Last Element Duplicating? (Bug?)
... the new value.
So loop 1, the value and $arr[2] become $arr[0], which is 'foo'.
Loop 2, the value and $arr[2] become $arr[1], which is 'bar'.
Loop 3, the value and $arr[2] become $arr[2], which is 'bar' (because of loop 2).
The value 'baz' is actually lost at the first call of the second foreach lo...