Python

Refer to the article written by a brother for practice: http://blog.51cto.com/000011211684/2052701Main purpose, familiar with the file list of the increase, deletion, change operation ...# python 3.6  File Open Operation practice #  date:2017-12-26# 

Use Python logging to record log information such as DebugDebug above information written to fileInfo above info output in consoleImport Osimport loggingvde_logging_name = "vde_logging" Log_file_path = Os.path.join (Os.path.dirname (__file__), "Vde_

Then the last time to continue to study.Create a settings classWhen new features are added to the game, some new settings are often introduced. Here's a module named settings that contains a class named settings that stores all settings in one place

The super function is used to solve diamond inheritance.First, the inheritance of Python and the invocation of the parent class memberParent class:class Base (object): def __init__ (self): print ("base init". ")Normal method calls the

Installing Python+seleniumBlogging is a good choice, first of all, is to worry about their own forgotten, second, you can make a reference:In fact, this is their first time to build a Python environment (before the use of a week of idle), or

First, the Python OS module introductionThe OS module is simply a python system-programmed operating module that can handle files and directories that we manually need to do on a daily basis.You can view the Help documentation for the OS module:>>>

Multi-threaded embarrassing encyclopedia caseCase requirements refer to the last embarrassing encyclopedia single process case: http://www.cnblogs.com/miqi1992/p/8081929.htmlQueue (Queued object)A queue is a standard library in Python that can be

Python's tuples are similar to lists and can be accessed through an index, supporting heterogeneous, arbitrary nesting. The difference is that elements of the tuple cannot be modified. Tuples use parentheses , and the list uses square brackets

ObjectiveSometimes the return value from the interface is encoded in a format similar to "%u4e0a%u6d77%u60a0%u60a0", not the Unicode encoding in Python.The Unicode encoding inside Python should be this format: \u4e0a\u6d77\u60a0\u60a0Unicode

First, python35 installation and environment variable configuration1. Python installation package:https://www.python.org/downloads/2. Installation:Installation path: C:\Python353. Environment variable configuration:"Computer Right-click"-"Properties"

2017.12.20 Python file I/O1.open parameters and Character EffectOpen (file, mode='r', Buffering=none, Encoding=none, Errors=none, Newline=none, closefd= True)========= ===============================================================Character meaning--

Write slowly ...--------------------------------------------------------------------------------------------------------------- -----------------Scrapy with XPath, due to XPath (' text () '). Extract automatically filters the option to null, and

Look back on yesterday's question1, the user input 3 times, and realize the number of times to show the remaining1i =02 whileI :3Username = input ('Please enter user name:')4Password = input ('Please enter your password:')5 ifUsername = ='YH'

ImportNumPy as NPdefTest_run (): Data=np.random.random ((3,4)) """[ [0.80150549 0.96756513 0.18914514 0.85937016] [0.23563908 0.75685996 0.46804508 0.91735016] [0.705 41929 0.04969046 0.75052217 0.2801136]]"""Data=np.random.rand (3,4) """[ [0.4

1. IntroductionPython provides built-in function map (), receives two parameters, one is a function, one is a sequence,Map functions The incoming function to each element of the sequence sequentially, and returns the result as a new listBack.For

EvalFunction: evaluates the string str as a valid expression and returns the result of the calculation.Syntax: eval (source, globals, locals), valueParameters:Source: The code object returned by a Python expression or function compile ()Globals:

Introduction to the Chapter3 list3.1 What is a list?A list is a series of elements that are arranged in a particular order.bicycle = [' Trek ', ' Cannondale ']Print Bicycle3.1.1 Accessing list elementsPrint (Bicyle[0])3.1.2 Index starting from 0

First, Python3 the text and binary data to make a distinction. The text is Unicode encoded, str type, for display. The binary type is the bytes type, which is used for storage and transport. Bytes is a sequence of byte, and STR is a sequence of

#九九乘法For I in range (10):Print ("". Join (["%dx%d=%-2d"% (m,i,m*i) for M in range (1,i+1)]) #%d formatted output by integer format-Indicates left alignment, 2 means less than 2 digits two bits, insufficient position with space1x1=11x2=2 2x2=41x3=3

This article mainly introduces a simple example of numpy array splicing, involving the introduction of the NumPy array, numpy array of properties and other content, with a certain reference value, the need for friends can refer to. The NumPy array