Python

#! /Usr/bin/ENV Python #-*-coding: UTF-8-*-# Last modified: thu 09 Feb 2012 02:52:49 CST [Dev] "" docstring "" _ revision _ = '0. 1 'import timeimport datetime # obtain the timestamp S = datetime of a certain time. datetime (,) print "s: % s" %

Common Python types >>> A = 1 >>> type (a) >>>> A = 1.0 >>> type () >>> A = 'abc' >>> type (a) >>> A = (1, 2) >>> type (a) >> A = [1, 2]; >>> type () >>> A = {1, 2 }>>> type (a) >>> A = {1:1, 2: 2 >>>> type (a) List, set, and dict are variable

Cross-package reference method of Python Assume that the package hierarchy is as follows: Package1/_ init _. py subpack1/_ init _. py module_11.py module_12.py module_13.py subpack2/_ init _. py module_21.py module_22.py Now, if module_21 in

Countless people wrote blogs/post about this issue, but I have fixed it again. Publish the answer first.   1. mysqldb connection type Conn = mysqldb. Connect (..., use_unicode = true, charset = "utf8 ",)   2. the string typeof () obtained by

Let's take a look at the following: Code The "weird" phenomenon. In Windows, I Have A f.txt file, which contains the following content. Helloworld code 1, With open('f.txt ', 'R') as F: Print F. readlines () with open('f.txt', 'rb') as F: Print F.

Previously, when collecting statistics and exporting the consumption of server players in each region, you must sort them in ascending order and in descending order.This is the requirement. The partition is in the descending order. If the partition

MmsegAlgorithmIs an extension of the maximum matching algorithm. To put it simply, when mmseg matches each time, it always matches two more words backward, and then selects the optimal overall match for the three words. Mmseg provides the

From tkinter import * Def get (): Indium = Ent. Get ()PIC = photoimage (file = indium)TEM = can. create_image (250,200, image = pic)  Root = TK ()Root. Geometry ('600x600 + 270 + 50 ') Lab = label (root, text = 'name of the picture ', font =

I just learned Python and used range in the previous loop. Later I saw someone using xrange. Then I checked it and found that xrange is better than range, mainly reflected in the memory. Range actually creates a list and stores all the data in the

Htmlparser is a python module used to parse HTML. It can analyze tags and data in HTML, and is a simple way to process HTML. Htmlparser adopts an event-driven mode. When htmlparser finds a specific tag, it calls a user-defined function to notify the

When collecting and summarizing game data, some data is stored in dictionaries every day. When I want to collect statistics for multiple days, I need to merge the dictionaries. If the keys are the same, their values are added. The update method

Yield command. You can pause a function and return intermediate results. The function that uses this command will save the execution environment and restore it if necessary. The generator is more powerful and complex than the iterator, so it takes

#!/usr/bin/env python#-*- coding: utf-8 -*-#code:myhaspl@qq.comimport cv2import numpy as npfn="test1.jpg"print 'http://blog.csdn.net/myhaspl'print 'myhaspl@qq.com'printprint 'loading %s ...' % fnprint 'working',img =

#! /Usr/bin/ENV Python #-*-coding: UTF-8-*-# code: myhaspl@qq.comimport cv2import numpy as npfn = "test1.jpg" If _ name _ = '_ main _': Print 'HTTP: // blog.csdn.net/myhaspl'print 'myhaspl @ QQ.com 'print print 'loading % s... '% FN print 'working',

XML usage: 1. xml. etree. elementtree is a useful module for processing XML message packets. 2. The element executes the XML root node. 3. ELEM. Find (PATH): Find the child node whose path is path under the root node. 4. ELEM. findall (PATH): The

View Original String formatting   In python, the output tag is similar to the printf () format in C. In python, the % operator is used to format the output string. The common format is Format mark string % value group to be output The "format

  Developing multi-threaded application systems is a common requirement in daily software development. The current programming language provides good support for multi-threaded development, whether through library support or built-in multi-threaded

The socketserver module in the python standard library can easily develop simple server programs.     import SocketServer class MyHandler(SocketServer.StreamRequestHandler): def handle(): addr = self.request.getpeername() print 'connection from:",

Similar to other languages, Python set is a disordered, non-repeating element set. Its basic functions include link testing and deduplication. the Set object also supports mathematical operations such as Union, intersection, difference, and

Asynchronous callback is required in many scenarios to avoid blocking. This is a simple example. #! /Usr/bin/ENV Python #-*-coding: UTF-8-*-import loggingimport queueimport threadingdef func_a (A, B): return a + bdef func_ B (): passdef func_c (a,