(1) (http://www.pythontab.com/html/2013/pythonjichu_0128/182.html)
First, analyze the slice operation from the principle:
A slice of the list, inside of which is calling the __getitem__,__setitem__,__delitem__ and slice functions. The slice function is also associated with the range () function.
The key passed to the slice is a special slice object. The object has attributes that describe the orientation of the requested slice, for example:
1 2 3 4
A = [1, 2, 3, 4, 5, 6] x = A [
In Python, we define a string, as shown below.
Define a string in Python and assign it to a variable.
We can access a single character by subscript, as with all languages, subscript starting from 0 (= = I think I write a good brain.)
At this point, we can use slicing to intercept a part of our defined string.
There are two ways to use slices: 1. Simple slices without step size
The syntax format is this:
1. First define a grid string, such as Hebe, a
Map Slicing Tool CollectionRecently more interested in map tile generation, search for a number of useful tools, found that the following three kinds have been more mature, complete documentation. Of course there are a lot of special tools or better and no find, welcome to add.Maptiler (gdal2tiles GUI version): The current version is Alpha, can be cut into the TMS standard format tiles, and generate Openlayer and Google Map call example. Support for a
–slice
Description
function is actually a constructor of a slice class that returns a slice object.
A slice object consists of 3 property start, stop, step, and start and step defaults to none. A slice object is used primarily to slice a sequence object into a corresponding element. : Slice (A, B, c). When the Seq[start:stop:step] is evaluated, Python invokes seq.GetItem (Slice (Start, stop, Step)). Even if you don't. Custom sequence types
>>> Help (Slice)
class slice (object)
| Slice (stop)
oracle| data
Oracle Data slicing technology author: Stream Side home: http://liulee.myrice.com
Oracle's Oracle Enterprise 8.0.5 has won the favor of customers with its superior performance, and it provides developers with great flexibility with rich inline functions, pl/sql support, multi-platform, application server integration, etc. In Oracle's user rights assignment, only insert,update,select,delete,execute such as tables, functions, synonyms, vie
Organize an example, PS and FW slices of the problem, hope to be helpful to everyone
The following figure is the navigation bar for the Web site:
Next we use the slice tool (red circle) to cut the diagram.
According to the color or other circumstances you want to cut, as shown in the following figure:
The benefits of slicing: first, in the slow speed of the situation, originally want a big picture to see after all, now cut into a lot of small
data according to machine performance.(3) Save the database configuration in the authentication libraryis to set up a DB, this DB separately save user_id to DB mapping, each time you access the database to query the database first to obtain the specific DB information, and then we need to do the query operation.Advantages: Strong flexibility, one-on-one relationshipDisadvantage: The query before each query, will cause a certain performance loss.Above in detail for you to introduce the database
River into the new system, Access the new database.In addition to spending a little, the risk of transformation is quite small. Of course, not all systems can be divided into such libraries.To sum up, when the database reaches a certain scale, vertical segmentation and horizontal segmentation are the project leader must consider the issue, regardless of the use of the method, you need to understand the business, based on the actual situation of the system, choose the most appropriate method.Dat
This period of time to understand the MySQL Shard technology and master-slave copy just tidy up the mind map to draw a record, hoping to give the people who need some helpP.S.: Personal finishing, there may be errors, but also hope that the ~The problem to be solved1. The operation of massive data exceeds the maximum limit of single table and library.2, access pressure exceeds the database system limits, performance degradation3, database replication, disaster tolerance and other issuesSolution
Explain the triangular indexing algorithm for mesh in the previous article.The first thing to know is how the vertex array is generated:So the figure, a large rectangle, is made up of 6 vertices and two rectangles.In general, building this rectangle requires knowing the position of each vertex and the relationship between the vertices and vertices.Ok Initialize vertex position private void Initvertexpos () { int currentindex = 0;
definition declaration
Structstudent { charname[100]; intage; }; Intmain (intargc,char*argv[]) { students1={"Wang", 1};//struct Student s1={}; students2={"Wang2", 2}; return0; }
4. Three mesh operator#include 5.const topicsconst-defined variables, in the C + + compiler, made a symbol table, key 6. Citing topicsA reference is a constant pointer inside C + +. type name the nature of the reference is th
Tag: no 51ctoUnity adds memory when the mesh is updated, and the general method is to use an array to fill in. Vector3[] vertices = new Vector3[segmentCount * 4]; Vector3[] normals = new Vector3[segmentCount * 4]; Vector4[] tangents = new Vector4[segmentCount * 4]; Color[] colors = new Color[segmentCount * 4]; Vector2[] uvs = new Vector2[segmentCount * 4]; int[] triangles = new int[segmentCount * 6]; me
The conditional operator is the only three-mesh operator of the C language, meaning that it requires 3 data or expressions to form a conditional expression whose general form is:Expression 1? Expression 2: Expression 3 If expression 1 is true, the result of the operation of the trinocular operator is the value of expression 2, otherwise it is an example of the value of expression 3: to Judge if a>b, then take a, otherwise b result is 5C language: Thre
Give your illustrator software users a detailed analysis of the design of metal gears and mesh background posters for the production of a tutorial.
Tutorial Sharing:
All right, the information above is the detailed design of the metal gears and mesh background poster for all the users of this software, illustrator, to share the whole content. The user sees here the small weave to believe every
:
Reference type
The key must be a type that supports equality comparison (= = =), for example: number,string,array,struct, etc.
Value can be of any type
It can be dynamically scaled and there are no restrictions
Definition syntax:map[keyType]valueType{ key1: value1, key2: value2, ... }// eg:m := map[string]int{ "age": 10, "month": 12, "day": 7, "num": 1, // 这里最后一行必须加上逗号,要不然,就把 "}"放在这个一行}You can also use the Make function to define a map to he
After Advice
Processing after a call
Throw Advice
Exception handling thrown at the time of the call
Execution com.sea.web.controller.UserController. * (..))execution : Indicates executionFirst *: return value ; This means that whatever the return value is.Com.sea.web.controller.UserController: denotes that classSecond *: Presentation method: All Methods under Class*(..) : All methods, methods of any parameters are executedanotation Annotation
check, permission interception, etc.@Override Publicboolean prehandle(httpservletrequest arg0, HttpServletResponse arg1, Object handler) throws Exception { System. out. println ("Handlerinterceptor1....prehandle"); Handlermethod Handlermethod = (Handlermethod) Handler; ///The class name HandlerMethod.getBean.getClass () can be intercepted by the Interceptor . GetName ();Get Method Name Handlermethod. GetMethod (). GetName (); // set to True, test using return true ; }}2. Inte
Slice (slicing) action
The slice operations of multidimensional data in NumPy are the same as those in Python for list slices. The parameters are composed of three parts of Start,stop,step.
Import NumPy as np
arr = Np.arange (a)
print ' array is: ', arr
slice_one = arr[:4]
print ' slice begins at 0 And ends at 4 are: ', slice_one
slice_two = arr[7:10]
print ' slice begins at 7 and ends at: ', Slice_two
s Lice_three = Arr[0:12:4]
print ' slice beg
Tutorial 1. Drag out the guides to enlarge the document so that the guides are more accurate.
Figure 1
2. Using the slicing tool, first slice the top edge and the circle below.
Figure 2
3. This step, cut out the left and right slices, single pixel slices, you need to enlarge the canvas to 1600/%, so that you can select a single pixel.
In a Web page, the slices on the left and right end up as cells, and if the contents of the middle cell are n
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