What is the difference between namespace dot namespace and nested namespace?(轉貼)

For C# Namespace: 

Is there any difference between:

namespace Outer.Inner
{
}

And

namespace Outer
{
    namespace Inner
    {
    }
}

in C#?

No difference whatsoever, those are the same thing, however the first one is more common.

Python f string and r string

1. r string: (Ref:https://stackoverflow.com/questions/2953834/windows-path-in-python)

What is the best way to represent a Windows directory, for example "C:\meshes\as"?

you can use always:

'C:/mydir'

this works both in linux and windows. Other posibility is

'C:\\mydir'

if you have problems with some names you can also try raw string literals:

r'C:\mydir'

(在C#中，如針對Path, 可用@"path")

2. f string (Ref:medium.com)

可用 f-string 改成如下格式(在C#, 請用$"string{variable}")，就可以將之前的變量帶入並格式化輸出喔！：
f"I am {first_name} {middle_name}. {last_name}"