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summary HTTP(HyperText Transfer Protocol) is an application layer protocol used to transfer hypertext. The network protocol stack of AliOS Things includes HTTP components and provides HTTP client standard capabilities. Developers can quickly realize data interaction with the server through HTTP GET, POST and other methods on the device side ...

1, Vectorization and broadcasting The concepts of vectorization and broadcasting are the basis of numpy's internal implementation. With vectorization, you don't need to use explicit loops when writing code. These loops can not be omitted, but are implemented internally and replaced by other structures in the code. The application of vectorizat ...

[Algorithmic Basics Lesson] 1. Basic Algorithms (Top)] Quick Sort, Merge Sort, Binary 1. Basic Algorithms (Top) 1.1 Quick Sort step Determine the demarcation point: x = q[l] / x = q[(l + r) / 2] / x = q[r] / randomAdjust range: Recursive processing on left and right ends Template void quick_sort(int q[], int l, int r) { if ( ...

selenium driver has its own delay function, which is divided into explicit waiting and implicit waiting. To sum up briefly: Explicit wait: it is mainly for an element to be visible, clickable, etc. within the specified time. If it exceeds the time, an exception will be thrown. Implicit waiting: it is mainly facing the whole page. The next ste ...

1, Prepare 10.117.201.80 and 10.117.201.81 two physical machines 2, Installation Skip the installation of Nginx. 80 and 81 need to be installed here. Refer to the previous installation documents The above two physical machines should be installed Download keepalived-2.0.15 tar. gz Unzip to / usr/local / tar -xf keepalived-2.0.15.tar.gz ...

hive distribute by group application tuning Group by fields in the table set hive.auto.convert.join=true; set hive.auto.convert.join.noconditionaltask=true; set hive.auto.convert.join.noconditionaltask.size=10000000; set hive.mapjoin.smalltable.filesize=200000000; set hive.merge.mapfiles = true; set hive.merge.mapredfiles = false; --MR Small ...

Title Description Link: ICPC Liaoning replay Title Description: Palindrome string is a string that is exactly the same as itself after inversion For example: "ABA", "ACMMCA", "A". Given a series of strings with the same length, please perform the following operations in order to construct the longest palindro ...

Stack memory and heap memory The declared variables and function names are stack memory, but heap memory is used in dynamic memory management. Stack memory is relatively compact, so it has large local correlation. There is a dynamic expansion in the heap during operation, and the release needs to be displayed. new is called at run time. ve ...

JavaScript this keyword In object-oriented languages, this represents a reference to the current object. But in JavaScript, this is not fixed. It will change with the change of execution environment. In a method, this represents the object to which the method belongs.If used alone, this represents a global object.In the function, this repres ...

💦 Today, let's learn about the more basic DataStream API in flink, which is used to process stream data. This article is mainly in the form of pyflink to explain to the small partners who are interested in the content of previous periods 👇: hadoop topics: hadoop series articles.spark topics: spark series.Flynk topics: Flink series. 💛 The A ...