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Can someone explain __all__ in Python?
...ut python packages.
Generally, __all__ only comes into play when the from xxx import * variant of the import statement is used. This applies to packages as well as to modules.
The behaviour for modules is explained in the other answers. The exact behaviour for packages is described here in detail....
How do servlets work? Instantiation, sessions, shared variables and multithreading
...) method is invoked. By default, this method determines which one of the doXxx() methods to invoke based off of request.getMethod(). If the determined method is absent from the servlet, then an HTTP 405 error is returned in the response.
The request object provides access to all of the informatio...
In practice, what are the main uses for the new “yield from” syntax in Python 3.3?
...
I suppose those get_list_values_as_xxx are simple generators with a single line for x in input_param: yield int(x) and the other two respectively with str and float
– madtyn
Jan 31 '18 at 23:11
...
Difference between 3NF and BCNF in simple terms (must be able to explain to an 8-year old)
...
91
The subtle difference is that 3NF makes a distinction between key and non-key attributes (also ...
Homebrew install specific version of formula?
...ql
postgresql
homebrew/versions/postgresql8 homebrew/versions/postgresql91
homebrew/versions/postgresql9 homebrew/versions/postgresql92
We can simply install it by typing
$ brew install homebrew/versions/postgresql8
Cloning into '/usr/local/Library/Taps/homebrew-versions'...
remote: Countin...
How to implement a rule engine?
...s called 'RulesAssemblyGenerator' which I have included below.
namespace Xxx.Services.Utils
{
public static class RulesAssemblyGenerator
{
static List<string> EntityTypesLoaded = new List<string>();
public static void Execute(string typeName...
Is R's apply family more than syntactic sugar?
...me(z <- lapply(y, foo))
# user system elapsed
# 2.89 0.00 2.91
system.time(z <- vapply(y, foo, numeric(1)))
# user system elapsed
# 1.35 0.00 1.36
Jan. 1, 2020 update:
system.time({z1 <- numeric(1e6); for(i in seq_along(y)) z1[i] <- foo(y[i])})
# user syst...
What is the most efficient/elegant way to parse a flat table into a tree?
...
Leniel Maccaferri
91.3k4040 gold badges331331 silver badges445445 bronze badges
answered Dec 22 '10 at 4:31
bobobobobob...
C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
...员信息>
注意：同时为列表成员指定多个[XmlArrayItem(typeof(XXX))]可实现多种派生类型混在一起输出。
(9)排除不需要序列化的成员
类声明：
public class Person
{
public string Name;
[XmlIgnore]// 这个属性将不会参与序列化
public bool S...
C#对象序列化与反序列化 - 更多技术 - 清泛网 - 专注IT技能提升
...员信息>
注意：同时为列表成员指定多个[XmlArrayItem(typeof(XXX))]可实现多种派生类型混在一起输出。
(9)排除不需要序列化的成员
类声明：
public class Person
{
public string Name;
[XmlIgnore]// 这个属性将不会参与序列化
public bool S...