Python

#1. n!def fact (N): if n = = 0: Return 1 Else Return N*fact (n-1)Print (Fact (10))#2. Fibonacci sequence F (n) =f (n-1) +f (n-2)def f (n): if n = = 1 or N = = 2: Return 1 Else return f (n-1) +f

Script learning, write more will be, to a personal write super Invincible low sub-domain query script#Coding:utf-8ImportReImportRequestsImportUrllibImportUrllib2ImportBS4 fromBs4ImportBeautifulSoup Key=raw_input ("Please input top domain:")Print

In order to facilitate the decomposition of the task, each step to do what we need to do, you can input Chinese characters, but the Chinese characters will be error when running, so you can add commentsSingle-line CommentThe instruction is #, just

The module getpass that is called when the password is hidden is previously spoken.The method of calling the module is import [Mod_name]Windows under the module of our system in its installation directory Lib directory.We write the module is

A-depth copy# assignment operations, which are common to a list = [a.append= A + (666)print(A, B) #[1, 2, 3, 666] [1, 2, 3, 666]# for shallow copy, the first layer creates a new memory address, and starts at the second level# points to the same

Import time>>>time.time () 1523673134.203531>>> time.time ()/3600/24/36548.3153624916466 # Can be computed apart from the time altogether gone 48 years >>> Time.localtime () time.struct_time (tm_year=2018, tm_mon=4, tm_mday=14, tm_hour=10, tm_min=

Problem:　Your program will create a large number (possibly millions) of objects, resulting in a large memory footprint.Solution:　　 for classes that are primarily used as simple data structures, you can greatly reduce the memory that the instance

Speaking before the combination:There are two solutions to solving code redundancy problems between classes and classes: 1, inheritance 2, combined1, inheritance: Describes the relationship between classes and classes, what is what, a subordinate

There is a class of threads that need to meet the criteria before they can proceed, and Python provides support for the Threading.condition object for the conditional variable thread, which, in addition to providing a rlock () or lock () method,

Object-oriented (OOP): inheritance, encapsulation, polymorphism #创建类: Class naming rules are capitalized, camel- Class Foo: #Foo A keyword that represents the name of the class to be created #创建类中的函数 def Bar (self): #do

Pyhon3--opening and closing of file operation files Open () opens the file; Close () closes the file. Opening the file must close the file, so open () and close () are used in pairs. The open () parameter means.

Question: Under the win system, Python, the 2.0.3 environment, the Django run Times error, the information is as follows: Unhandled exception in thread started by .wrapper at 0x000002203f3fec80>Traceback (most recent):File "C:\Program

Python Development Ide:pycharm,eclipse#下载专业版而且不要汉化33An. operator1. Arithmetic operator: +-*/*%//2. Member operator: in not in result is Boolean typeName='Li Jongdan'#if ' Li Dan ', the error is output#' Li Jongdan ' Dan is a substring, a subsequence#

Python is very common for files, such as we need to open a file to get the data, or create a file to change the datavi 1.txthello wordWe create a file called 1.txt, and then we need to manipulate the file1、对文件进行读 file = open("1.txt" "r") print

Python * urllib_urlopen () Python urllib Library provides a Web page data from a specified URL address, which is then parsed and processed to obtain the desired data. One, Urllib module Urlopen () function: Urlopen (URL, data=none, timeout,

Login interface and realize guessing number game Enter User name password Show welcome message after successful authentication Guess the number game, guess three times Three-time error after

Collection{} can represent a collection, {"As", "SST"} is a set set, and there are no duplicate elements in the collection.#add () adding elements to the collection girls = {' MF ', ' sl ', ' YJ '}girls.add (' XF ')#pop () randomly deletes an

This article to share the content is about Opencv+python implementation of the camera call, has a certain reference value, the need for friends can refer to Use the OpenCV videocapture () function to define the camera object, whose parameter 0

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This article is to share the content of Python practical function advanced, now share to everyone, the need for friends can refer to the content of this article 1.pyhton Assertion How to add an exception parameter for an ASSERT assertion