Python

Pymysql IntroductionPymysql is a library used in the python3.x version to connect to the MySQL server. MySQLdb is used in Python2.Installation method:Install PymysqlUsage examples:This code is connected to the database and executes a query statement,

The methods for logging in the Python program are detailed in the following links: http://blog.chinaunix.net/uid-27571599-id-3492860.htmlThe log is displayed directly in the console without specifying a log file to write to. The default log level is

There are three ways to invoke system commands in Python:1, os.system (' command '), this method is to directly call the standard C system () function, only a sub-terminal to run Systems command, and not get the command after the execution of the

To prevent two modules from importing each other, Python default all the modules are imported only once, if you need to re-import modules, Python2 7 can be used directly with reload (), Python3 can use the followingTo prevent two modules from

Method One:Copy CodeThe code is as follows:f = open ("Foo.txt") # Returns a File objectline = F.readline () # Call the ReadLine () method of the fileWhile line:Print line, # followed by ', ' will ignore newline characters# print (line, end = ") #

always worry about is the debugging of Python, once wrote C is compiled with GDB directly debugging, relaxed and happy. Now, this is an interpretive procedure. I don't know what to do. Use log bar, sometimes it is a small program, do not want to

1.StringIO ModuleStringio is used to read and write to a string buffer or to a memory file like a file.f = Stringio () # Ready for writingf = Stringio (BUF) # Ready for readingF.close () # explicitly release resources heldFlag = F.isatty () # Always

Transferred from: http://cuiqingcai.com/947.htmlSo then, the small partners together and I really move towards our reptile road.1. Chop a webpage down in minutesHow to grill Web pages? In fact, it is based on the URL to get its web page information,

Save path:/usr/lib/python2.6/site-packages/tab/py Writing a Python script$ cat tab_enable.py#!/usr/bin/python# Python startup fileImport SysImport ReadLineImport RlcompleterImport atexitImport OS# tab CompletionReadline.parse_and_bind ('

ShutilAdvanced files, folders, Compression pack processing modulesShutil.copyfileobj (FSRC, fdst[, length])Copy the contents of the file to another file, which can be part of the contentView CodeShutil.copyfile (SRC, DST)Copy filesView

Next, modify the previous login to pass the user name to the validation function. def Login (func): # receives a function as a parameter def Inner (name) :Print (" user authentication passed ....") ") return func (name )

Decorative DeviceAdorner mode (Decorator pattern) allows you to add new functionality to an existing object without changing its structure. This type of design pattern belongs to the structural pattern, which is a wrapper as an existing class.This

1 #题目: decomposes a positive integer factorization. For example: Enter 90 and print out 90=2*3*3*5.Code:  2 import pdb  3 tmp = int (Input (' Please enter a positive integer: '))   4  print ('%d= '%tmp,end =  ')   5   6 i = 2  7  li = []  8  #pdb.

This blog is a sequel to the feature extraction of the article using Python, and mainly introduces the construction of the article eigenvector with TF-IDF weights.In [1]:# extended thesaurus with TF-IDF weights # in the first document, the word

#!/usr/bin/env Python3Import re‘‘‘#常用功能介绍[Pp]ython matches "python" or "python"Rub[ye] matches "Ruby" or "Rube"[Aeiou] matches any one of the letters within the brackets[0-9] matches any number. Similar to [0123456789][A-z] matches any lowercase

1 #-*-coding:cp936-*-2 ImportNumPy as NP3 ImportMatplotlib.pyplot as Plt4 5 6 #Construct Training Data7x = Np.arange (0., 10., 0.2)8m = Len (x)#number of training data points9x0 = Np.full (M, 1.0) TenInput_data = Np.vstack ([x0, X]).

Regular expressionsUse the Compile method to match the regular objectEquivalent to M=re.match ("^[0-9", "18ruue");p rint M.group ()Re.matchRe.searchRe.subRe.findallRe.splitRe.search----> GroupRe.splitRe.findallRe.subBubble sortModuleThe file in the

Python CGI programming Apache configuration, pythonapache 1. Edit http. conf and add two lines. The path can be customized. AllowOverride NoneOptions NoneOrder allow, denyAllow from allAddHandler cgi-script. pyAddHandler default-handler. html. htm.

Random module and pythonrandom Module As follows: #! /Usr/bin/env python # encoding: utf-8import sysimport platformprint (platform. python_version () print (sys. version) import randomprint (random. random () #0.6445010863311293 # random. random ()

Differences between import, reload ,__ import _ in python ,__ import_python ImportPurpose:Import/introduce a python standard module, including the. py file and the directory with the _ init _. py file.E. g: import module_name[,module1,...] from