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How to get the return value from a thread in python?
The function foo below returns a string 'foo' . How can I get the value 'foo' which is returned from the thread's target?
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What is “export default” in javascript?
...n you can import that default export by omitting the curly braces:
import foo from "foo";
foo(); // hello!
Update: As of June 2015, the module system is defined in §15.2 and the export syntax in particular is defined in §15.2.3 of the ECMAScript 2015 specification.
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How to randomly select an item from a list?
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Use random.choice()
import random
foo = ['a', 'b', 'c', 'd', 'e']
print(random.choice(foo))
For cryptographically secure random choices (e.g. for generating a passphrase from a wordlist) use secrets.choice()
import secrets
foo = ['battery', 'correct', 'ho...
What is the difference between the GNU Makefile variable assignments =, ?=, := and +=?
...s evaluated when VARIABLE is accessed. It is equivalent to
ifeq ($(origin FOO), undefined)
FOO = bar
endif
See the documentation for more details.
Append
VARIABLE += value
Appending the supplied value to the existing value (or setting to that value if the variable didn't exist)
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Set a default parameter value for a JavaScript function
...ing you want, including false or null. (typeof null == "object")
function foo(a, b) {
a = typeof a !== 'undefined' ? a : 42;
b = typeof b !== 'undefined' ? b : 'default_b';
...
}
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Adding a Method to an Existing Object Instance
...here is a difference between functions and bound methods.
>>> def foo():
... print "foo"
...
>>> class A:
... def bar( self ):
... print "bar"
...
>>> a = A()
>>> foo
<function foo at 0x00A98D70>
>>> a.bar
<bound method A.bar of &...
Scala: What is a TypeTag and how do I use it?
... Scala's types are erased at runtime (type erasure). If we wanna do
class Foo
class Bar extends Foo
def meth[A](xs: List[A]) = xs match {
case _: List[String] => "list of strings"
case _: List[Foo] => "list of foos"
}
we will get warnings:
<console>:23: warning: non-variable typ...
Iterate over a list of files with spaces
...ld replace the word-based iteration with a line-based one:
find . -iname "foo*" | while read f
do
# ... loop body
done
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京东天天果园与“褚橙”从合作演变成打假 - 资讯 - 清泛网 - 专注C/C++及内核技术
...观规律影响，甜酸比相对11月10日以后成熟的果子略低，这个属于正常现象。
与此同时，伴随着这几年“褚橙”的红火盛况，打假难题也一直困扰着“褚橙”的正牌经销商。例如，今年本来生活销售的“褚橙”，每个上面都贴上...
Create instance of generic type in Java?
...type information is available via reflection. e.g.,
public abstract class Foo<E> {
public E instance;
public Foo() throws Exception {
instance = ((Class)((ParameterizedType)this.getClass().
getGenericSuperclass()).getActualTypeArguments()[0]).newInstance();
...
}
}
...