Python

Note: 1, the comments in the code should not be placed in the source program to run, will error.2, the data set in the code is derived from Http://archive.ics.uci.edu/ml/datasets/Car+Evaluation3, for the naïve Bayesian principle, you can view my

When I have data need to save, the first time generally think of writing to a TXT file, of course, the amount of data is larger than the time to write to the database more convenient management, the need for network transmission to be serialized,

Today, when you write a script, you need to define a global time variable, but you cannot update it after the function has been modified because the function has its own namespaceLast_send_time = 0def Test (): = 2print last_send_time# Would

1. Basic RequirementsWrite a shopping applet that asks for the following features:(1) To allow users to enter wages;(2) Export shopping menu and product price;(3) Calculate whether the user can pay;(4) Output the user's remaining money, ask the user

Source of the topic:https://leetcode.com/problems/zigzag-conversion/ Test Instructions Analysis:This topic is the subject of string processing. Enter a string and a number, fill the string in the inverted Z-input string, and then read the

First, installationThis time, using Python under win7, download the installation package directly to complete the installation. Many of the links on the Internet can not find resources, took some effort, finally found the available

MatplotlibMatplotlib. Use(' Agg ')Import Matplotlib.pyplot as PltFrom Cstring import Stringio= [3, ten, 7, 5, 3, 4.5, 6, 8.1= = = 1/1.5plt.bar (x, y, width, color=" Blue ")Io=stringio ()Plt.savefie (io,format= "PNG")plt.xticks(rotation=70)image_tag=

In Python, it takes a relatively ingenious approach to create a two-dimensional array and assign an initial value, because a language other than C++/java can be conveniently used in a a[i][j]=0 manner.Can be used in the form of list parsing, eg: for

Read the fileTo open a file object in read-file mode, use the Python built-in open () function to pass in file names and identifiers:>>> f = open ('/users/michael/test.txt ', ' R ')The identifier ' R ' means read, so that we have successfully opened

Project needs to do WinForm program and PowerPoint interaction, the WinForm generated images are automatically copied to the PPT. A simple service solution is currently being done using Python. Because the requirements are 32-bit programs, the

I hear you don't want to rip the program ape, not a very nice ape. So today comes the nonsense, not the code, only the design idea.0x00 Up-Initial designOur goal is to design a common weak password scanner, the basic function is for different types

Python has both Str object and Unicode object two strings that can hold the byte encoding of the characters, but they are different types, which is important and why there are encode and decode.The significance of encode and decode in Pyhton can be

Like the C language in the Goto,shell of break behind and out of the hierarchy in the method in Python, this is not because of the low Python design, but to allow one-time jumping out of multiple loops can easily cause confusion in the process of

1. Urllib2.urlopen (Request)url = "http://www.baidu.com" #url还可以是其他协议的路径, e.g. ftpvalues = {' name ': ' Michael foord ', ' Location ': ' Northampton ', language ': ' Python '} data = Urllib.urlencode (values) user_agent = ' mozilla/4.0

Single for Loop for in Xrange (1, 4, 9, 16, 25, 36, 49, 64, 81)Single-Loop +if condition for inch if x 1, 4, 9, 16]Multiple for loop>>> [(I,J) for I in range (10) [(0, 0), (0, 1), (0, 2), (0, 3), (0, 4), (0, 5), (0) (6), (0, 8), (0, 9), (1, 0), (1,

* Wingide is the perfect choice if it's just a pure Python developer.Advantages: Short, quick start, fast commissioning, quick response, auto-completion fast .There are no eclispe, sluggish, lame debugging functions.Shortcut keys can be selected

SMTP is the protocol that sends messages. The Python support for SMTP has two modules, smtplib modules and email modules. emailresponsible for structuring the message, smtplib responsible for sending the message.An example of a simple implementation

A simple Hello ProgramName = input (")print('Hello,', name)1.Python Case Sensitive2. dynamic Type# A is an integer Print 'ABC'# a changed to string print(a)Finally, it is important to understand the representation of variables in computer memory.

Multi-line statementsA new line is generally used as the Terminator for a statement in a Python statement.But we can use a slash (\) to divide a line of statements into multiple lines of display, as follows:Total = Item_one + \Item_two +

How does Python record logs?Python logging is very simple. It can be recorded in just a few lines of code. The annotations are clear and I will not explain them in detail.Python code# Encoding: UTF-8Import logging# Get the log object, which can