uplink module

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

to other ONU are discarded. The uplink data from each ONU to the OLT is transmitted through the time Division multiple access (TDMA) mode, and Olt allocates a transmission slot for each ONU. These slots are synchronized, so when packets are coupled to a single fiber, there is no collision between the different ONU packets. Uplink technology is the core technology of EPON, and the main technologies of e-pon

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

The seajs module depends on loading and module execution, and the seajs module depends on loading. This article describes how to load dependencies between seajs modules and how to execute modules. The following is a detailed introduction. Entry Method Each program has an entry method, similar to c'smainFunctions and seajs are no exception. Series 1 demo is used o

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

Day5 module learning-sys module, day5 module-sys Sys module The sys module is a system-related module. The following describes common methods of the sys module: 1. sys. argv # command l

Import time# def month (n): # time.local () # struct_time=time.strptime ("%y-%m-1", "%y-%m-%d") # print (struct_time) # Return Time.mktime (struct_time) # # Print (month (2)) # Ret=time.localtime (1500000000) # print (ret) # Print (Time.strftime ( "%Y", ret) # print (struct_time) # ret=time.localtime () # Print (ret) # Print (Time.strftime ("%Y")) # time module: # Print (time. Time ()) #时间戳 # timestamp Time, GMT, float data type for machine # L

,sort_keys=true,indent=10,separators= (', ', ': '), Ensure_ascii=false)Print(JSON_DIC2)Liu, PickleTwo module JSON for serialization, for converting between string and Python data typesPickle for conversion between Python-specific types and Python data typesThe Pickle module provides four functions: dumps, dump (serialization, Save), Loads (deserialization, read), load (can not only se

Time module and datetime module, datetime ModuleTime module and datetime Module 1. Call Import time # Call time moduleIi. usage method 1. time. time Obtain the timestamp. The number of seconds from January 1, 1970 of the year when Linux was born to the time when the program was executed.2. time. sleep () Pause the prog

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

Python Learning (6) module-third-party module, python third-party modulePython third-party module Install third-party modules In Python, third-party modules are installed through the setuptools tool. Python has two package management tools that encapsulate setuptools: easy_install and pip. Pip is currently officially recommended. If you are using Mac or Linux,

OS ModuleOperating system functions, involving files and directories and other operations. Not subject to platform restrictions. The OS module allows a program to run without any changes while running under Linux and Windows. Similar to command operations in Windows PowerShell and Linux.Common operationsOS.GETCWD () Gets the current working directory, which is the directory path of the current Python script work os.chdir ("dirname") To change the curr

under Windowsstruct struct ModuleThe module can turn a type, such as a number, into a fixed-length bytes>>> struct.pack ('i', 1000000000000000000) Traceback (most recent call last): " " in struct.error:argument out of range# struct.error: ' I ' format requires-2147483648 Importjson,struct#Imagine uploading 1t:1073741824000 files through a client a.txt#to avoid sticky packets, you must customize the headerheader={'file_size': 1073741824000,

JSON module:JSON: Information exchange (conversion of strings) to any languageAfter JSON conversion, all types can be converted to double quotation marks before being converted to STRFor example: file reads and writes:1 #Write file:2 ImportJSON3f = open ("Demo.txt","W")4DIC = {"name":"g_l"}5Dic_str =json.dumps (DIC)6 f.write (DIC_STR)7 Print(Type (DIC_STR))8 Print(DIC_STR) 1 # Read file: 2 import JSON 3 f = open ( " Demo.txt ", " R " ) 4 f_read = F.read () 5 f_read = Json.

(Bytes_st) #加密 Return M.hexdigest () #返回加密后的结果## sha_256 =hashlib.sha256 (BYTES_YBQ)# sha512 =hashlib.sha512 (BYTES_YBQ)# Print (Sha512.hexdigest ())# Print (dir (m))#md5加密是不可逆的, cannot be decrypted.# MD5 MD5AF# 123456 f0dfb4c958c67903e542e31c729c629b#撞库Import Base64s= ' hahaha 'byte_s = S.encode () #字符串变成二进制res = Base64.b64encode (byte_s) #base64编码Print (Res.decode ()) #把bytes转成字符串.Jie_mi_res = Base64.b64decode (Res.decode ()) #base64编码Print (Jie_mi_res.decode ()) Day5-python

# FromFunction creates an array from a function, a custom function, and an array from a function; # the FROMPYFUNC call format is Frompyfunc (func, Nin, Nout), Nin is the number of input parameters for this function, and Nout is the number of return values for this function. print'b is:%s' %bData Type Objects (Dtype) and structure arrayData type Object, ie. An instance of Numpy.dtype describes how an array object resolves a fixed-size memory segment in memory. It depicts several aspects of the

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.

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