Python

1, CentOS6.5 install Python's dependency pack Yum Groupinstall "Development Tools"Yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel Libpcap-devel Xz-devel 2, download the Python3.

Problem: centos6.5 installed a anaconda and Anaconda3 two versions, these two versions of the Python version is not the same, one is python2.7.10, one is python3.5.2 So how do you make the environment default to python2.7.10? Upon review, we found

VSFTPD run in the ubuntu,ftp root directory for /home/ftpdir, the root directory has a folder get, program run FTP.CWD (' Get ') Error: Failed to change Directory Workaround: 1. Sudo gedit/etc/vsftpd.conf Add: Local_root=/home/ftpdir The

First, remove the current path: Base_dir1 = Os.path.dirname (Os.path.dirname (__file__)) Base_dir2 = Os.path.dirname (Os.path.abspath (__file__)) # __file__: Refers to the directory address where this file resides (including the file name) but is

__init__ Method Introduction:If a base class has an __init__ () method The derived class "s __init__ () method must explicitly call it to ensure proper in Itialization of the base class part of the instance; For example: "Baseclass.__init__ (self,

stdin, stdout, and stderr variables contain stream objects that correspond to standard I/O streams. If we need to better control the output, and print does not meet our requirements, they are what we need. They can also be replaced by redirecting

The SYS module includes a set of very useful services that contain a number of function methods and variables to handle the Python run-time configuration and resources to interact with the system environment outside of the previous program, such as

in the Python function, enter the keyword parameter--the dictionary parameter, how to output in the order of input. For ease of understanding, cite several examples: example one: https://www.zhihu.com/question/24360507 #编写者 def Test (**kwargs):

The strip in Python is used to remove the first (left) character of a string, and Lstrip is used to remove the left character, Rstrip to remove the right character. All three functions can pass in one parameter, specifying the first and last

Keys = {"Status": True, ' name ': ' AAA '} def fun1 (keys): print ' fun1 ' print ' keys: ', keys print ' keys Address ", ID (keys) keys[' status ' = False def fun2 (keys): print ' fun2 ' print ' keys: ', keys print '

Variable object and type relation function cannot change parameter pass can change parameter pass variables, objects, and type relationships Python is a dynamic type language and does not need to declare a variable type beforehand, and the type and

Preface in Python, there are several ways to define and transfer function parameters: syntax meaning def func (name) general parameters can To match the position according to the location, or you can match the

1. The scope of the code in which variables function is referred to as variables, and the variables in different scopes do not affect each other. The variables defined inside the function are local variables, and the variables defined outside the

The SYS module can obtain command-line parameters, implement the function of passing parameters from outside the program to the program, and obtain the program path and the information of the current platform. 1.sys.plateform Current operating

Python2 and Python3 properties of the processing and implementation is not the same, the internal implementation of a large difference, this article refers to the concept of narrow sense. I. Attributes in the Python2 Attributes are declared using

Python is a weakly typed language, and many of the friends who turn from C + + are not very comfortable at first. For example, when declaring a function, you cannot specify the type of the parameter. The analogy with C is that all parameters are

These methods are located in the random module Random.random (), Math.random () with JavaScript, returns a floating-point number between [0.0,1) Random.uniform (A, B), returns the floating-point number between [a,b] The Python code print

There are eight methods of selenium positioning, ID, name, class, tag, Link_text, Partial_link_text, CSS, XPath 1. Locating elements with ID #coding =utf-8 from Selenium import webdriver import time driver =webdriver. Firefox () driver.get ('

def request_ajax_data (url,data,referer=none,**headers): req = urllib2. Request (URL) req.add_header (' Content-type ', ' application/x-www-form-urlencoded; Charset=utf-8 ') req.add_ Header (' X-requested-with ', ' XMLHttpRequest ')

A. download files using Urllib Import url lib url= ' http://www.pythontab.com/test/demo.zip ' url lib.urlretrieve (url, ' demon ') Two. download files using requests Import requests url= ' Http://www.pythontab.com/test/demo.zip ' r=requests.get