Python

Regular expressions are a rule that matches the contents of a stringCharacter group: [Character Group] the various characters that may appear in the same position make up a group of characters, and in regular expressions the characters are divided

OS.GETCWD (): View the current path .Os.chdir (): changes The current working directory .Os.listdir (): Lists all files in the directory and returns a list.Os.path.split (): Breaks the path into (folder, file name).Os.path.getmtime (PATH): The last

By default, member functions and member variables in Python are public, and there are no keywords such as class public,private in Python to decorate member functions and member variables.   In fact, Python does not have true privatisation support,

Objective:Always write bad regular expression, long time do not have to forget some, so in summary an article for later review.First, the commonly used matching rule summary table Mode Description \w

TCP Programming--Server1 Importsocket, threading, time2 3 defdealclient (sock, addr):4 Print('Accept New connection from%s:%s ...'%addr)5Sock.send (b'Hello, I am server!')#send data to client side6 whileTrue:7data = SOCK.RECV (1024)#receive

The test is as follows:import timeprint("chenfulin")# 返回格林威治西部的夏令时区print("time.altzone %d" % time.altzone# 获取时间，打印时间t = time.localtime()print(t)print("time.asctime(t) : %s" % time.asctime(t))# 延时 def my_sleep(): time.sleep(3)#

Tag: is the tail recursive efficiency stack Overflow save optimization return problem conditionRecursion is the function that calls this function internally.Characteristics of recursion:1. There must be a definite end condition, otherwise it will

Install http://download.libguestfs.org/python/guestfs-1.36.13.tar.gzError after execution:Then Baidu, Google, are said to install GCC or python-devel, executed, or error.Later on, there was no guestfs.h file. Then the full execution of Find/-name

Because there are differences between Python2 and 3, it may be necessary to switch back and forth between 2 and 3 in your daily work. In the same Python version, there may be projects that need to use django1.8, and other projects need to use django1

The basic structure of dictionary dictionaries# Dictionary, key-value pairs Dict class# Basic structure of the dictionary# The value of the dictionary can be any value# The key of the dictionary cannot be a list, a dictionary, preferably not

Http://docs.python.org/3/library/functions.html or rookie Chinese information1-Using functionsABS ( -20)# Find the absolute # to find the maximum value # turn to intfloat ("12.34 " # turn into float # turn into a string # turn into BOOL type bool ('

What's the Scapy module for?A: Scapy is a powerful interactive packet handler (written in Python). It can spoof or decode a large number of network protocol packets, can send, capture, match requests and reply packets and so on. It can easily handle

1. For loop syntax:For-Target in expression:Loop body2. Range ()Syntax: Range ([start] stop [, step = 1])--This bif has three parameters, two of which are enclosed in brackets, and the two arguments are optional--step =1 indicates that the value of

1-Classes and instancesclassStudent (object):def __init__(self, Name, score):#The first argument of the _init__ method is always self, which represents the created instance itselfSelf.name =name Self.score=scoredefPrint_score (self):Print('nams:%s,

1.78645445This is full, thanks to the author2. Problem: I met theWith_python_layer=1 make all-j&& make PycaffeProblemCxx/ld-o python/caffe/_caffe.so python/caffe/_caffe.cpp Touch python/caffe/proto/__init__. PY TouchPtyhon/caffe/proto __init__.py

1. Install the module with the PIP commandPip Install module namee.g. PIP install QRCode2. Unload the module with PIPPip Uninstall Module namee.g. PIP install QRCode3.PIP View all the modules that have been installedPIP List4.pip viewing module

Intermittent and repeated several times, today began to honestly write notes and draw flowcharts:One, Python format:# !/usr/bin/env python # -*-coding:utf-8-*-Ii. basic Input box and print:#!/usr/bin/env python#-*-coding:utf-8-*-Print("Hello world!")

Practice Goals:(1) Python implements a doubly linked list class.(2) Using a doubly linked list class to implement the basic stack structure.(3) Write the class to represent the binary tree, and realize the first order, the middle order, the

Python's Sys.path.append ()Import sys sys.path.append (' Address of Reference module ') 12Os.path.dirname (PATH) #返回文件路径Os.path.abspath (PATH) #返回绝对路径Directory:Base_dir = Os.path.dirname (Os.path.dirname (Os.path.abspath (file))Example#!/usr/bin/env

This article is mainly for you to introduce the PYQT to achieve the interface rollover switching effect, with a certain reference value, interested in small partners can refer to PYQT realization of the interface rollover switching effect is