Programmer Group

1. org.apache.commons.lang.StringUtils isBlank: Is the string empty (trim later) isEmpty: Whether the string is empty (not trim and judge) equals: Is the string equal join: a merged array is a single string, passing a delimiter Split: split string isNumericSpace: Is it number able before and after r ...

Built-in module for getting started with Python--logging module 1. logging -- log (1) The role of logs: <1>Log user information <2>Record personal running water <3>Record the running status of the software <4>Record instructions from programmers <5>For programmer code debugging (2) Functional simple configuration o ...

Recently, the blogger has a crawler project in hand, and began to study python crawler development in depth. This is my blog, which is also equivalent to my learning notes. I think the first step to learn crawler is to learn python multi-threading an ...

pthread Thread Knowledge Points The two fundamental issues of communication between threads are mutual exclusion and synchronization.` #include<pthread.h> 1. pthread_create1. Function Prototypeint pthread_create(pthread_t tidp,const pthread_attr_t attr,(void)(start_rtn)(void),void arg); 2. Functional functions:pthread_create is a functio ...

What is it? ss is the abbreviation of Socket Statistics. As the name implies, the ss command can be used to obtain socket statistics, which can display content similar to netstat. But the advantage of ss is that it can display more detailed info ...

logging module Logging Uses: 1. Recording User Information 2. Recording personal running water 3. Recording the running status of the software 4. Record the instructions issued by the programmer (springboard machine) 5. For programmer code debugging (print consumes memory and is not recommended during development and testing) Functional simple ...

Articles Catalogue Resources brief introduction fread, fwrite Basic Knowledge 3.1 Nutx configuration options 3.2 Definition of Nutx File Handles and File Descriptors 3.2.1 file_struct file structure 3.2.2 file_opcreation framework 3.2.3 Standard ...

brief introduction In the net package, there are many structures, various functions and methods. I decided to go through it on the whole and make a map. Copy and paste source: https://studygolang.com/stati... constant const ( IPv4len = 4 IPv6len = 16 ) global variable Commonly used IPv4 address. var ( IPv4bcast = IPv4(255, 255, ...

We all know that java is a static language, that is to say, if you want to execute a java program, you must compile it first and then execute it. So why does this article say that java can be executed without compiling? Actually, this is a new feature added in OpenJDK11 to enable the java source code of a single file to be executed directly wit ...

I. Concept: Signal is an event that UNIX system responds to certain conditions, and the process will take corresponding actions when it receives the signal. Signals are generated by some error conditions, such as memory segment collisions, floating-point processor errors, or illegal instructions. 1. ...