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Python notes: First Article (2): First recognition list and metadata, first article in python In Python, the list and element group are a Data Structure: A sequence. Each element in the sequence is assigned a sequence number. The position of the element, the position of the first original element is 0, and so on. Seque

([start], stop[, step]), which gets a random number from the specified range, in the collection incremented by the specified cardinality.such as: Random.randrange (10, 100, 2), the result is equivalent from [10, 12, 14, 16, ... 96, 98] gets a random number in the sequence. Random.randrange (10, 100, 2) is equivalent to Random.choice (range (10, 100, 2) on the re

[Python journey] Article 6 (7): development of simple host batch management toolsWith the learning and use of the Paramiko module, as well as the multi-thread and multi-process knowledge in Python, you can develop a simple host batch management tool. Obviously, when you manage hosts in batches, it is best for programs to execute concurrently, because it can maxim

File operationsWe have heard a problem, the elephant into the refrigerator divided into three steps: 1, open the refrigerator door, 2, put the elephant in, 3, close the refrigerator door. The steps of the Python file operation that we're going to talk about today are like steps to put an elephant into a refrigerator.Basic steps for manipulating files using Python

Python index)Vi. XPath: logical operation? 1.xpath There is also a relatively strong function, can be multiple attribute logical operation, can be supported with (and), or (or), non (not)? 2. The more commonly used is the and operation, while satisfying two propertiesVii. XPath: Fuzzy matching? 1.xpath also has a very powerful feature, fuzzy matching? 2. Mastere

Writing high-quality code-suggestions for improving python programs (2), high-quality python The original Article is published on my blog homepage. For more information, see the source! Recommendation 7: Use the assert statement to discover problemsAssert exists in many languages and is mainly used for debugging progra

A moduleA module is a code that someone else has written and can be referenced by an import. A standard library is a library that is officially released by Python and is installed by default when you install Python.1.osand system-related, such as:>>> Os.system ("LS-LRTHF")Total 20M-rw-r--r--. 1 root root 20M Jul 13:48 python-3.5.2.tgz-RW-------. 1 root root 958 J

Cycle:The execution of a piece of code repeats n times until a certain condition is met.In order to stop repeating execution at the appropriate time, the program needs to have a condition that satisfies the stop loop.There are three loops in Python (only two of them are in essence):While loopFor loopNested loopsBreak #完全结束一个循环本身Continue #停止当前循环体的执行 (equivalent to ignoring the statement behind continue) to begin the next loop body;While Loop #表达式为true,

Recently in learning Python, like many beginners, the beginning of a more tangled in the end is version 2 or version 3 is the future trend. In order to avoid too many detours, special online Check the relevant information, summed up some 2 and 3 differences, a lot of content is reproduced, the great God do not despise ha ... 1. Performance The Py3.0 runs Pystone

Recently in learning Python, like many beginners, the beginning of a more tangled in the end is version 2 or version 3 is the future trend. In order to avoid too many detours, special online Check the relevant information, summed up some 2 and 3 differences, a lot of content is reproduced, the great God do not despise ha ... 1. Performance The Py3.0 runs Pystone

27. Properties of the __DICT__ System 1) object may come from: The definition of its class, called the Class attribute Inherit the definition of the parent class The object instance definition (assigned value when initializing the object), called the object property 2) The properties of the object are stored in the object's__dict__In the properties: __dict__ is a dictionary, the key is the property name, and the value is

--------------------------------------------------------------------------------1. Iterator protocolAn iterator protocol is an object that must provide a next method that either returns the next item in the iteration, or causes a Stopiteration exception to terminate the iteration (only backward cannot go forward)2.python ' in for loop mechanism1. Turn them into an iterative object by calling The. __it

While loop　　1. Basic cycle 123456 while条件:# 循环体# 如果条件为真，那么循环体则执行# 如果条件为假，那么循环体不执行 2. BreakBreak to exit all loops 1234 whileTrue:print "123"breakprint"456" 3, continueContinue is used to exit the current loop and continue the next loop 1234 whileTrue:print "123"continueprint"456" Exercises1. Use while loop input 1 2