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Python JSON serialize a Decimal object
...ation is when you are using both marshmallow and graphene. When a query is called on a rest api, marshmallow works expectedly for decimal fields. However when it is called with graphql it raised an is not JSON serializable error.
– Roel
Apr 2 '19 at 9:45
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How to calculate a logistic sigmoid function in Python?
...f sigmoid(x):
return 1 / (1 + math.exp(-x))
And now you can test it by calling:
>>> sigmoid(0.458)
0.61253961344091512
Update: Note that the above was mainly intended as a straight one-to-one translation of the given expression into Python code. It is not tested or known to be a nume...
Pythonic way to combine FOR loop and IF statement
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@ChewyChunks. That would work but the call to enumerate is redundant.
– Johnsyweb
Aug 8 '11 at 20:40
141
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Laravel Schema onDelete set null
...re you set the foreign key field as nullable:
$table->integer('foreign_id')->unsigned()->nullable();
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Why does C# allow {} code blocks without a preceding statement?
...is going to work the same way anywhere in program flow.1
Instead, you typically use them to restrict the scope of some local variables. This is further elaborated here and here. Look at João Angelo’s answer and Chris Wallis’s answer for brief examples. I believe the same applies to some other ...
How to use timeit module
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The way timeit works is to run setup code once and then make repeated calls to a series of statements. So, if you want to test sorting, some care is required so that one pass at an in-place sort doesn't affect the next pass with already sorted data (that, of course, would make the Timsort real...
Why do you not use C for your web apps?
...t on the web. If you need more scalability, most organizations can economically just throw more cores at the problem and be fine. This is not true for everyone, of course. I'd imagine that the core of Google's engine is written in C or a similar language not only for speed, but to save real money...
BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
...BLUETOOTH SPECIFICATION Version 4.0 [Vol 6] Part B 2.4）
LLID（逻辑链路ID）：0x01表示该数据包是一个帧的延续内容，或者这是一个空的“逻辑链路控制及适配协议”数据包；0x02表示一个“逻辑链路控制及适配协议”数据包的开始...
When to use an interface instead of an abstract class and vice versa?
...blic methods of the base class, even though most times it does not need to call them.
(Overly simplified) example:
abstract class QuickSorter
{
public void Sort(object[] items)
{
// implementation code that somewhere along the way calls:
bool less = compare(x,y);
//...
Returning an array using C
... declaring scope, i.e., when the function returns.
You will need to dynamically allocate the memory inside of the function or fill a preallocated buffer provided by the caller.
Option 1:
dynamically allocate the memory inside of the function (caller responsible for deallocating ret)
char *foo(i...