Python

import os# gets the current directory print (OS.GETCWD ()) #改变当前目录os. ChDir ("D:\learn_python3") #生成单层目录os. mkdir ("1") #删除单层目录, The directory cannot have file Os.rmdir ("1") #生成多层目录os. Makedirs ("1\\test") #删除多层目录os. Removedirs ("1\\test")

Matrix operationsOn the difference between matrix and array in NumPy: http://blog.csdn.net/vincentlipan/article/details/20717163The difference between Matrix and array: Numpy matrices must be 2-dimensional, but Numpy arrays (ndarrays) can be

Variable definition rules:(1) Variable names can only be any combination of letters, numbers, or underscores(2) The first character of a variable name cannot be a number(3) The following keywords cannot be declared as variable names[' and ', ' as ',

#_ *_coding:utf-8_*_#!/usr/bin/env python#取余/diea=10B=3Print (a%3)X=1Y=3Print (x%3)#真正的除法/Print (2/3)#地板除://, the result is an integer (quotient)Print (2//3) #得0#逻辑运算#逻辑与Print (True and False)Print (1 and ') #1的布尔值True, ' The Boolean value is False,

1 Importurllib.request2 ImportRe3 4URL ='http://daily.zhihu.com/'5 defget_html (URL):6HTML =urllib.request.urlopen (URL). Read ()7html = Html.decode ('Utf-8')8 returnHTML9 Ten defget_url_num (HTML): Oneres = Re.compile ('') AUrl_nums =Re.findall

VirtualenvThe virtual Python Environment (venv) is a Python environment that helps you install different versions of Python modules on your local directory, so you can develop and test your code without having to install everything in your

One: Understanding UnitTestUnittest:python internal Unit test module; junit similar to Java;II: UnitTest Basic use1:import UnitTest2: Define a test class that inherits UnitTest. TestCase3:setup and teardown, each test function is run before and

import timeimport datetime# timestamp print (Time.time ()) #时间元祖print (Time.localtime ()) #时间戳转时间元祖print ( Time.gmtime (Time.time () +28800)) #时间元祖转时间戳print (Time.mktime (Time.localtime ())) #时间元祖转自定义时间格式print (Time.strftime (" %y%m%d ",

Import Mathdef my_abs (x): if x > 0:return xelse:return-xprint (My_abs ( -6)) #ax ^2+bx+c=0 def quadratic (a,b,c,): t = b*b-4*        A*cif a==0&b!=0:x=-(b/c) return xelif a!=0:if t>0:x1 = (-b+math.sqrt (t))/(2*a) x2 = (-b-math.sqrt (t))/(2*a)

' Create thread ' from threading import thread# defines a function def Foo (ARG): Print (ARG) #创建一个线程对象, and establishes a relationship with the function Foo above, args= Pass a value of 100 as parameter to the Foo function print ("Start creating

Tag: NIS ODI input log BSP bin value key stylePython jobs:Requirements:1. Level Three Menu2. Select to go to sub-menu in turn1 #!/usr/bin/env python2 #_*_coding:utf-8_*_3 #__author__ = ' Administrator '4 5Data={6 ' China':{7 'Zhejiang':{8

Python cannot achieve true multicore parallelism because of its own nature, but there are some third-party libraries that better simulate parallel operations in multi-core environments, such as PP packets and multiprocessing, so which can make the

1. Variable InterchangeA = 123= 456= =Python is a relatively simple variable interchange:A = 123= 456= b,aprint(A, B)2. Place the largest value in the list to the last# !usr/bin/env python # -*-coding:utf-8-*- = [11,44,33,66,22] for in range (Len

The relationship between Python crawler and Grandpa Mao:Python is the simplest and most popular language for development, and Grandpa Mao is the most liked renminbi.If you learn the Python crawler, you can earn more Grandpa Mao.We find that there is

First, the user login function instance1, note: The function must be written later after the first line of functions to enter the "" "" "" "" two pairs of three quotation marks after the return, the parameter values are automatically listed, the

In the company to do distributed Deep web crawler, set up a stable agent pool service, for thousands of reptiles to provide effective agents, to ensure that each crawler is the corresponding site effective proxy IP, so as to ensure that the crawler

This article mainly introduces the python3.5 implementation Socket Communication Example (TCP), small series feel very good, and now share to everyone, but also for everyone to do a reference. Let's take a look at it with a little knitting. TCP

1. Edit File/etc/init.d/nodemanagerservice [oracle@weblogic-01 ~]$ vi/etc/init.d/nodemanagerservice#!/bin/bash#chkconfig:345 70#description:start Stop Nodemanagerwl_home= "/home/oracle/oracle/middleware/wlserver_10.3" bea_owner= "Oracle" case "$

Objective has always used Python 3, recently studied the public development, each cloud platform only support Python 2.7, want to use other versions need to build their own environment. And the web does not search the Python 3 development of the

Pathlib usage reference, pathlib referenceIf any error occurs, you must specify pathlib as path3.x. It has powerful functions and is easier to operate directories. For example, you can use this module to operate directories using python3.x. Import