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abs() Return the absolute value of the number >>> abs(-100) 100 >>> abs(10) 10 >>> all() Determines whether all elements in the given iteratable parameter iterable are true, and returns true if so, False otherwise >>> all([100,100,100]) True >>> all([3,0,1,1]) False >>> any() Returns False ...

PHP encryption extension library Mcrypt extension library Summary: php upgrade from 7.0 to 7.1 discards an extension, that is, the mcrypt extension. Although the extension can be used normally on the installation, a warning will be given to tell us that the mcrypt related methods have been discarded and have been removed by 7.2. Therefore, it i ...

When outputting strings and variables, strings must be quoted, variables written directly, and connected with connectors. 1.Date object new.Date() gets the current system date new.Date.getFullYear() returns the year in four digits new.Date.getMonth() returns the month < 0 ~ 11 > new.Date.getDate() returns a day of a month < 1 ~ 31 ...

Author: Tyan Blog: noahsnail.com  |  CSDN  |  Brief book 1. Problem description Recently, a little thing was reinstalled on the server. As a result, the login shell interface turned into - bash-4.2 $, which was ugly and inconvenient to use. The main reason is that scp needs user name and host name, so it was modified. 2. Solutions Mod ...

Today, let's learn how to deal with the mixed operation of characters and numbers. Speak with questions: Question A: String decryption Title Description Now let a, a stand for the number 0, B, B stand for the number 1, C, C stand for the number 2 Z. Z stands for the number 25. Enter K, B and string. Please decrypt ...

                       . Its main advantages are as follows: 1. You can set different log levels to output only important information in the release version without displaying a large number of debugging information; 2. Especiall ...

I. overview scala is similar to higher-order function, which is a function that can receive another function as a parameter. 2, Import base package import random from functools import reduce 3, Custom higher order function #Define common functions and generate lists automatically def getList(): hList = list(range(5)) return ...

regular expression Actually, there are four main steps for reptiles: Clear goals (know where you are going to search or where you are going to search) Crawling (crawling all the contents of the website) Take out (get rid of the data that is useless to us) Process data (store and use as we want)Regular expressions, also known as regular expre ...

Unicode problem solving There is a small pit that only supports ASCII. If you call btoa("Chinese"), an error will be reported: Uncaught DOMException: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range. DOMString in browser is UTF-16 encoding. If the input strin ...

File is used to view file types. Different from Windows system, Linux system does not reflect the file type through the file name, so you need to use the file command to confirm. [admin@local ~]$ file exe exe: Bourne-Again shell script text executable As above, use the file command to view the type of exe file, whic ...