Python

One, what is a function?Definition: A function that encapsulates a set of statements by a name (function name), and to execute the function, simply call the name of its functionsCharacteristics:1. Reduce the duplication of code2. Scalability of the

Variable definition rules:1, can be composed of letters, numbers, underscores2. The first character cannot be a number3. Cannot use System reserved keywordsContract Specification:1, the variable name has the specific meaning2. Cannot use Chinese

Python is an object-oriented, interpreted computer programming language, invented by Dutchman Guido van Rossum in 1989, and the first public release was released in 1991.As of June 2017 Tiobe programming language ranking, Python has risen to fourth

# readme:# blogger Address:www.cnblogs.com/ne-zha# ne_zha# Requirements: # Write Login Interface #1. Enter user name password #2. Login successful display welcome message #3Error three lock Lock_file=open ('File_lock.txt','R') User_pass=open

1. Iterating through an array is, when you want to add a conditional modification, delete only the first# -*-coding:utf-8-*- a=[11,22,33,44,55] for in A: ifor i ==22: A.remove (i) for inch A: Print (i) " " 22334455[finished in 0.1s] "

One, Python data type(1) Python data types include numeric types, string types, tuples, lists, dictionaries(2) Numeric type can be divided into integer, Long integer, floating point type, plural type(3) strings, tuples, and lists are all part of a

All of Python's exceptions inherit from the base class: ExceptionHandled in a similar way to Java:Path = Raw_input ('Input the path') Array= Path.split ('/')Try: module= __import__ ('model.'+ array[0]) Model= GetAttr (module, array[0]) func= GetAttr

6. High-order features 6.1 iterationsGiven a list or tuple, we can traverse the list or tuple through a for loop, which we call iteration (iteration). In Python, an iteration is done through a for ... in.Because Dict storage is not ordered in list

Django is a popular framework used by Python to develop Web applications that integrates background rights management, models, forms, databases, and template functionality.The Django installation and configuration process is as follows.1. Download

A Python namp module is required to implement port status scanning.First to address: Https://pypi.python.org/pypi/python-nmap Download the Namp package.I downloaded the version 0.6.1, the OS is CentOS 7.Execute the following command to install the

Install the Python pip module URL Https://pypi.python.org/pypi/pip Select, click Download Unzip the file to the C:\Users\Administrator\AppData\Local\Programs\Python\Python35\Lib\site-packages directory In the CMD console, cut to the

There are n petrol stations on a circular road, numbered 0,1,2,... n-1, each filling station has an upper limit, which is kept in the list limit, that is, Limit[i] is the upper limit for refueling at the petrol filling station, while driving from

Reference link https://triaquae.gitbooks.io/python/content/chapter1.htmlFirst, the installation of Python1, the Windows platform to the Python official website to download the Windows version of the installation media, follow the prompts to install

Look, brother, Alex. Video mentions a job: calculate string "1-2 * ((60-30 + ( -40/5) * (9-2*5/3 + 7/3*99/4*2998 +10 * 568/14))-( -4*3)/(16-3*2))" () Not available EvalI tried, the idea might be a little bit more complicated, but the code is not

The list in Python is used the most, the commonly used methods are:Append (value) extend (L) Add all elements of the specified list insert (index, value) inserts remove (value) Pop (index) does not specify delete last, clear ()

A python string is worth saying.Look first:>>>"Hello world!"‘Hello world!‘We write a double-quote, but after printing it is a single quote.What's the difference?The answer is that there is no difference between the single and double cited .>>>‘Let‘s

Environment: python2.7 Comsenzxp comes with MySQL Installing the Python-mysql module Data format: Account information in TXT format. Data is one line of data. Difficulties: Some lines only account, no password, some are empty lines, some lines at

Python Note 8: network programming, python note Network Programming Python has a built-in library that encapsulates many common network protocols. Therefore, python has become a powerful network programming tool. Here is a simple description of

Subprocess module, subprocessI. Introduction Subprocess was first introduced in version 2.4. It is used to generate sub-processes, connect their input/output/errors through pipelines, and obtain their return values. Subprocess is used to replace

Python Exercises 1-10, python1-10 1. There are four numbers: 1, 2, 3, and 4. How many three numbers can be composed of different and non-repeated numbers? What is each?2. the bonus paid by the enterprise is based on the profit. If the profit (I) is