Python

Installation steps:1. Installing FreeTDS#tar ZXVF freetds-0.91rc2.tar.gz#cd FREETDS-0.91RC2#./configure--prefix=/usr/local/freetds--with-tdsver=8.0--enable-msdblib--with-gnu-ld--enable-shared-- Enable-static#make && make Install#echo

Querying the latest files in the specified directory using the OS module1 ImportOS2 3 #Enter directory path, output the full path of the latest file4 defFind_new_file (dir):5 " "find the latest files in the directory" "6File_lists =Os.listdir

First, motiveRecently intends to toss vn.py, but only py27 version, because always used to use the latest stable version, so have to install PY27 environment, have to sayPython's global lock is really annoying.As a lazy cancer patient, it is

1. IntroductionThe regular expression itself is a small, highly specialized programming language, and in Python, the Cheng can be called directly to implement regular matching by embedding the re module in the embedded form. The regular expression

#看到贴吧大佬在发图, get ready to steal.#只是爬取一个帖子中的图片1. Create a new Scrapy project firstScrapy Startproject Tubaex2. Create a new crawlerScrapy Genspider Tubaex https://tieba.baidu.com/p/40928162773. Write down Items First#保存图片的urlImg_url=scrapy. Field ()4,

The difference between JSON and pickleIn Python's serialized two modules, the JSON module is used to convert between strings and Python data types, and the other pickle module is used for Python-specific types (all data types and Python data types

Today's content:Re moduleCollentions ModuleRegular expressions1.re module:The common methods under the RE module are:1 ImportRe2 #1.re.findall ()3Ret1 = Re.findall ('a','Eva Egon Yuan')#take ' a ' for the eye and find all. and returned as a list. 4

One or three methods of representation1. Timestamp (timestamp):Time.time () #得到的是float类型2. Formatting (format String):Time.strftime ('%y/%m/%d%h:%m:%s ') #得到的是字符串类型3. Structured (struct_time):Time.localtime ()#Import Time Module>>>Import Time#time

If a function parameter contains a default parameter, then all parameters after this default parameter must be the default parameter, otherwise it will be error: syntaxerror:non-default argument follows default argumentFor example:#-*-Coding:utf-8-*-

Map () is a Python built-in high-order function that receives a function f and a list, and then, by putting the function f on each element of the list in turn, gets a new list and returns.Map () is a Python built-in high-order function that receives

2017-08-01 22:39:50First, the basic command of Scrapy crawlerScrapy is a professional crawler framework designed for continuous operation, providing an operational scrapy command line. Scrapy command-line format Scrapy Common

Os.getpid in Python ()Os.getpid () is the process number that gets the current process, and os.getppid () is the process number that gets the parent process of the current processThe role of __name__ = ' __main__ ' in Pythonegdef main ():print "We

1. ABS (): Returns the absolute value of the given parameter. If the argument is a complex number, it returns the modulus of the complex number, that is, the square root of the sum of the real and imaginary parts of the complex number:>>>abs ( -1)1>>

Long time no update, today think about what to record, the decorator what do not say, very familiar with the record.1.monkey Patch.is actually a way of dynamically modifying classes, including property methods.For example A = a () A.foo = foo and

Module: A module is a file containing Python definitions and declarations, and the filename is the suffix of the module name plus the. Py.In fact, the import loaded module is divided into four general categories:1 code written using Python (. py

One, Configparser module1. The configuration file format is as follows:# User information; User information [tom]user=tompasswd:123age=18is_admin=truesalary=31[jack]user=jackpasswd:123age=18is_admin=truesalary=31Summary: In the configuration file

In the process of data processing often encounter various time data, but because the format of time data is not uniform, so there are some problems in data processing. Python's standard library provides the appropriate modules, but usability is not

Background requirements:Random business development, server data is also more and more, developers, operators are more and more. At this time if a large number of people need to log on to the server, then it is necessary for us to manage the user.

In Python, the process of declaring a variable is omitted, and when a variable is referenced, a simple assignment statement is done at the same time, declaring the variable type, the definition of the variable, and the associated process, so how

Study makes me happyFirst, assertTitle Assertion# method OneTry Assert u "Baidu a bit" in Driver.title Print (' assertion test pass. ')Except Exception as E: Print (' assertion test fail. ', Format (e))# method Twoif u "Baidu a bit, you