ds3231 module

DS3231 high-precision clock module is cheap and easy to use, SDA/SCL two IO ports can handle the basic functions, but when using the alarm interrupt output encountered a problem, that is, the alarm interrupt will only output once, and then always keep low level.This problem data sheet does not explicitly, in the online search for a long time, a little information has not been found, had to toss themselves.A

The following content of this article will be updated here: "http-flv Live Module (nginx-http-flv-module) based on Nginx-rtmp-module module" continued. Note: Many of the configurations below are no longer available because the implementation is somewhat different from the earlier implementations. In order to see the hi

one, sys module1. Definition:A module that interacts with the Python interpreter2, sys module commonly used methods(1) sys.argv methodDefinition: Command line Arguments list, the first element is the path of the program itselfCases:Import Sysprint (SYS.ARGV) # SYS.ARGV just reflects the current module name, with a list of # and Pycharm software automatically adds

Operating system: Windows Server R2 (64-bit)C:\Windows\System32\WindowsPowerShell\v1.0\Modules under the Servermanager, but still can not find.To solve this problem, it takes 2 steps:1. Implementation strategy in PowerShell (execution policy)One reason is that the default execution policy for PowerShell is restricted, which means that you can run a single command, but you cannot run scripts, including format and configuration files (. ps1xml), module

format, same as Time.strftime ()Stream: Specifies the output stream that will log, can specify output to Sys.stderr,sys.stdout or file, default output to Sys.stderr, stream is ignored when stream and filename are specified simultaneouslyLogging.getlogger ([name]): Create a Log object:Returns a logger instance that returns root logger if no name is specified. As long as name is the same, the returned logger instances are the same and only one, that is, the name and the logger instance are one by

the directory if it is empty, if the upper level is also empty, also delete, etc.# Os.removedirs (R ' a/b/c/d ')# Delete a file# Os.remove (R ' d ')# os.rename (' oldname ', ' newname ')# get file \ Directory information# Obj=os.stat (R '/users/zhangrenguo/pycharmprojects/passers-by dialogue/day18/os module. Py ')# print (obj)# The path delimiter for the current file# Print (OS.SEP)# line Delimiter# Print (OS.LINESEP)# Environment Delimiter# Print (O

Regular expressionsMeta-character quantifier (?)Metacharacters:.\w \d \s \w \d \s\ t \ \b() |[] [^]^ $Quantifiers:* + ?{n}, {n,}, {n,m}Re moduleHow to invoke the RE moduleFind: FindAll search match FinditerSplit and replace: Split Sub SubnCompile: Compile Save timeHow many places is the RE module used in?Quantifier: Indicates a match 0 or 1 timesAfter the quantifier: is the sign of the lazy matchGroup naming: (? pFindall/split Ungroup Priority: (?: Re

1.math Module >>> dir (Math) [' __doc__ ', ' __name__ ', ' __package__ ', ' ACOs ', ' acosh ', ' asin ', ' Asinh ', ' atan ', ' atan2 ', ' Atanh ', ' ceil ', ' copysign ', ' Co S ', ' cosh ', ' degrees ', ' e ', ' Erf ', ' erfc ', ' exp ', ' expm1 ', ' fabs ', ' factorial ', ' floor ', ' fmod ', ' frexp ', ' fsum ', ' Gamma ', ' Hypot ', ' isinf ', ' isNaN ', ' ldexp ', ' lgamma ', ' Log ', ' log10 ', ' log1p ', ' modf ', ' pi ', ' pow ', ' radians

I. Hashlib module　　 Python's hashlib provides a common digest algorithm, such as MD5,SHA1 and so on.Abstract the algorithm is also called hash algorithm and hashing algorithm. It uses a function to convert any length of data into a fixed length data string (usually represented by a 16-binary string).　　abstract the algorithm is to calculate the fixed-length summary digest by the Digest function f () to the data of arbitrary length, in order to find out

Python3 OS module sys module hashlib module, python3os Module 1 '''2 OS Module 3 very important module 4 '''5 import OS 6 # print (OS. getcwd () # Get the current working directory 7 # OS. chdir (r 'pathname') # change the curre

Python3 time module datetime module random module, python3time Module 1 '''2 time module 3 '''4 5 # import time 6 # print (help (time) # help () help 7 # print (time. time () # number of seconds (timestamp) from January 1, 1970-key 8 # time. sleep (3) # CPU does not work,

One, shelve module　　1 Importshelve2 3 #based on the Pickle module,4 5D = Shelve.open ('shelve_test')6 7 8 classTest (object):9 def __init__(self, n):TenSELF.N =N One AT1 = Test (123) -T2 = Test (456) -name = ['Alex','Rain','Test'] thed['Test'] =name -d['T1'] =T1 -d['T2'] =T2 - +D.close ()Second, XML module1. Increase, delete, change, checkImportXml.etree.ElementTree as Ettree= Et.parse ("List.xml") Ro

Time module of python module, time module of python ModuleTime Three Forms of time Timestamp: Generally, the timestamp indicates the offset calculated in seconds from 00:00:00, January 1, January 1, 1970. We run "type (time. time ()" and return the float type. Formatted time String (Format String): '2017-12-06' ''' % Y two-digit year indicates

In Nodejs, modules can be divided into core modules and file modules. The core module is compiled into binary code, which can be referenced only with require notation, such as (Require (' net ')). File module refers to a JS file, a JSON file, or a. node file. The path to add the file after referencing the file module:/.../.../xxx.js represents the absolute path

Python Road (13th) "Day21" Time module, random module, string module, verification code practiceOne, Time modulethree types of time representationIn Python, there are usually several ways to represent time: Timestamp (timestamp): Typically, a timestamp represents an offset that is calculated in seconds, starting January 1, 1970 00:00:00. (from 1970 to no

Sys module and serialization module (instance description) of the python module, and python serialization Sys module The sys module is an interface for interacting with the python interpreter. Sys. argv command line parameter List. The first element is the program path sys.

The Linux kernel module provides a simple introduction to the overall architecture of the Linux kernel, which is already large and includes components or many more. How do we include the required parts in the kernel?One way is to compile all the required functions into the Linux kernel. This can cause two problems. One is that the generated kernel will be large, and the second is that we will have to compile the kernel again if we want to add or remov

follows:可见在logging.basicConfig()函数中可通过具体参数来更改logging模块默认行为，可用参数有filename：用指定的文件名创建FiledHandler（后边会具体讲解handler的概念），这样日志会被存储在指定的文件中。filemode：文件打开方式，在指定了filename时使用这个参数，默认值为“a”还可指定为“w”。format：指定handler使用的日志显示格式。 datefmt：指定日期时间格式。 level：设置rootlogger（后边会讲解具体概念）的日志级别 stream：用指定的stream创建StreamHandler。可以指定输出到sys.stderr,sys.stdout或者文件(f=open(‘test.log‘,‘w‘))，默认为sys.stderr。若同时列出了filename和stream两个参数，则stream参数会被忽略。format参数中可能用到的格式化串：%(name)s Logger的名字%(levelno)s 数字形式的日志级别%(levelname)s 文本形式的日志级别%(pathname)s

Maven builds a single module in a multi-module project separately. maven builds a module project Recently, multiple maven modules have been used in a company project. Because the project is large, it takes too long to build the entire project after each modification. You need to build a module separately. mvn has the f

How do I refer to another module in the module?Method One:Google provides its own reliance, compile introduction needs to use the module.Method Two:Each module will eventually be compiled into a corresponding suffix for the Aar file The first step: you need to first add the following code under android{} under Build.gradle in the host module:Repositories { Fla