Programmer Think

Environmental Science: 1. Ubuntu server 2,python3.7.5 install 1,python3.7.5 The installation is relatively simple, and the process is roughly. / configure - > make & & make install - > create python soft connection pip soft connection It's easy to install. Only when the installation is completed and running can we encounter all ki ...

In these two days, we need to do a serial communication to receive the information transmitted from peripheral devices. Many programs on the Internet are more complex. We have written a simple and easy program. The main process is: open serial port - > initialization - > circular reading. The code is as follows: #include & ...

1. General query 1 SELECT the column field to be displayed FROM table name [WHERE condition]; Two cases: select userid, username from userinfo where user age < 30; 3. Query all fields: SELECT * FROM table name; 2. order by asc | desc 1 SELECT * FROM userinfo ORDER BY userage ASC; //Ascending order 2 SELECT * FROM useri ...

Links to the original text: https://my.oschina.net/kooksee/blog/542430 python Notebook Programming Style Competition Although my python age is not very high, I would like to share ...

SqlHelper.class.php + Fireant Mining System APP develops T:/ I8O.2853.296O V. Vim/Vi has always been the most popular text editor on UNIX/Linux system. Since I came into contact with UNIX in 2001, Vim/Vi has always been my preferred editor for modifying system files and writing simple programs. It is a necessary tool for home travel. How to imp ...

I. MySQL Gets the Current Date-Time Function 1.1 Get the current date + time Function: now() mysql> select now(); +---—+ | now() | +---—+ | 2008-08-08 22:20:46 | +---—+ In addition to the now() function to get the current date and time, MySQL has the following functions: current_timestamp() ...

Socket Sockets are an abstraction layer through which applications can send or receive data, open, read, write, and close like files.Sockets allow applications to plug I/O into the network and communicate with other applications on the network.A network socket is a combination of IP addresses and ports. Development: Sockets were originally a ...

I. Preface Crash problems may arise in our applications during daily development or testing. We should adopt a zero tolerance attitude towards such problems, because if such problems occur online, it will seriously affect the user's experience. If Crash happens to be in the process of development, developers can locate the cause of the problem ...

Less keyword commands used: 1. at: (automatic) represents the automatic execution of a task Example: ``` at 10am mar 31 2015 at> echo "taxes due" At> ^D (ctrl+D for storing the task) ``` atq: Show scheduled tasks atrm job-d: Delete a set tas ...

Hisry commands are available on both inux and unix to query the history of previously executed commands However, this record does not contain a time item So you can only see commands, but you don't know when to execute them Here's how history records time: Step 1: Check to see if your system supports it Note: This method is only valid for bash ...