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List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...-needing method, but sometimes unavoidable.
Example:
import copy
class Foo(object):
def __init__(self, val):
self.val = val
def __repr__(self):
return 'Foo({!r})'.format(self.val)
foo = Foo(1)
a = ['foo', foo]
b = a.copy()
c = a[:]
d = list(a)
e = copy.copy(a)
f = cop...
How to escape braces (curly brackets) in a format string in .NET
...
For you to output foo {1, 2, 3} you have to do something like:
string t = "1, 2, 3";
string v = String.Format(" foo {{{0}}}", t);
To output a { you use {{ and to output a } you use }}.
or Now, you can also use c# string interpolation like ...
What does a lazy val do?
...pendent or cyclic structures. E.g. this leads to an stack overflow:
trait Foo { val foo: Foo }
case class Fee extends Foo { val foo = Faa() }
case class Faa extends Foo { val foo = Fee() }
println(Fee().foo)
//StackOverflowException
But with lazy vals it works fine
trait Foo { val foo: Foo }
ca...
How to delete duplicates on a MySQL table?
...
Doesn't seem to work with InnoDB. I ran ALTER TABLE foo ENGINE MyISAM to work around it, changed the engine back after.
– Martin
Jul 17 '13 at 23:06
13
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Inserting a string into a list without getting split into characters
...
To add to the end of the list:
list.append('foo')
To insert at the beginning:
list.insert(0, 'foo')
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C#泛型(List)中基类和子类 怎么转换？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...型(List)中基类和子类 怎么转换？List<ChildClass> childList = ...Foo(List<BaseClass> baseList);需求：把子类列表传入函数Foo，Foo支持所有子类列表。方法一：Foo(ch...List<ChildClass> childList = ...
Foo(List<BaseClass> baseList);
需求：把子类列表传入函数...
How to call a parent class function from derived class function?
...uate it by adding the base class's name followed by two colons base_class::foo(...). You should note that unlike Java and C#, C++ does not have a keyword for "the base class" (super or base) since C++ supports multiple inheritance which may lead to ambiguity.
class left {
public:
void foo();
};...
Kotlin: how to pass a function as parameter to another?
Given function foo :
10 Answers
10
...
How to unset a JavaScript variable?
...o-op when the target isn't an object property. e.g.,
(function() {
var foo = 123;
delete foo; // wont do anything, foo is still 123
var bar = { foo: 123 };
delete bar.foo; // foo is gone
}());
But since global variables are actually members of the window object, it works.
When proto...
What use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?
...ocated within your project. Something like this:
CMakeLists.txt
cmake/FindFoo.cmake
cmake/FindBoo.cmake
CMakeLists.txt content:
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
find_package(Foo REQUIRED) # FOO_INCLUDE_DIR, FOO_LIBRARIES
find_package(Boo REQUIRED) # BOO_INCLUDE_DI...