Python

One, the Python database Programming Interface (API):1. Global variables: Any database module that supports the 2.0 version of the DB API must define 3 global variables that describe the properties of the module, because the API design is flexible

#drawsevensegdisplay.pyImportTurtle, DateTimedefDrawLine (Draw):#draw a single-segment digital tubeTurtle.pendown ()ifDrawElseTurtle.penup () turtle.fd (40) Turtle.right (90) defDrawdigit (digit):#Draw seven-segment digital tube based on

Operator.itemgetter functionThe Itemgetter function provided by the operator module is used to get the data of which dimensions of the object, with some ordinal numbers (that is, the number of the data that needs to be fetched in the object), as

View View accepts Web requests and returns Web responses The view is a Python function that is defined in the views.py The response can be a Web page of HTML content, a redirect, a 404 error, and so on The response processing

operator continuation1 arithmetic operations2 comparison operations3 Assignment operations4-bit operation:Note:5 Logical operationsand annotations:1 in Python, and and of the Boolean logic calculus, as you expect, but they do not return a Boolean

First, the definitionCan be understood as a data type that automatically implements the iterator protocol (other data types need to call their own built-in __iter__ method), so the generator is an iterative objectTwo types of generators (Python has

1 Data Collection OverviewTo start a data analysis project, the first thing you need to do is get to raw data, and there are many ways to get the raw data. Like what: Get DataSet (DataSet) file Using crawlers to collect data Get

Guess the number program:#Author: MegoAge_mego =30Count =0While Count Guess_age =int (Input ("Enter the number you want to guess:"))If Guess_age==age_mego:Print ("The number entered is correct!")BreakElif guess_age > Age_mego:Print ("The number

I. IO model1. IO Model classification1. Blocking IO--------blocking IO2. Non-blocking IO------nonblocking IO3. multiplexed io-------multiplexing4. Signal-driven IO-------signal driven IO (not used in work, just as an understanding)5. Asynchronous IO-

1. ReferenceA gitbook online book on sorting Algorithms, "Ten classic Sorting Algorithms", using JavaScript & Python & Go2. Bubble Sort: 22 comparison, swap positionarr = [9,8,2,23,3]#Bubble sort 22 comparison, swap position#3 5 9) 1 8#A B C D E#3 5

Tag:__init__   target    time period    odi   init     tips    live   self    concurrency     1, the threading module provides the class Thread,lock,rlock,condition,semaphore,event,timer,local2, The common method provided by the threading module (1)

Python calls 7zip command to implement file batch decompression1. Enter the path where the compressed file is located2. You can modify the extracted file path and the type of decompression required in the code, include, unzip all the files in the MP4

Exception handlingErrorErrors in the program are generally divided into two types:1, syntax error, this error, can not get through the Python interpreter syntax detection, must be corrected before the program execution2, logic errors, human-caused

Premise: The modules that Python uses to manipulate Excel are Xlrd, XLWT, Xlutils. Read, write, and update an Excel operation. You need to import these modules first when you operate Excel, as follows: excel-read operation knowledge points:

This article mainly introduced the Python programming variable assignment operation, combined with the instance form Analysis Python assignment, the displacement, the multivariate assignment operator and so on related operation use skill, needs the

This article mainly introduced the Python programming list operation, combined with the instance form analysis Python list creation, the use, the update, the deletion and so on implementation method and the related operation skill, needs the friend

1. Using the function input (), print (), the string can be separated by commas. end= ' keyword parameter, you can print without wrapping, sep= ' you want the delimiter ', keyword parameters, replace the default delimited string. 2. Input output is

The content of this section1. Basic function syntax and features2. Parameters and Local variables3. return valueNested functions4. recursion5. Anonymous Functions6. Introduction to Functional programming7. Higher-order Functions8. Built-in

Things are a lot more messy this time. Part of the time in doing operations, part of the time to do Development. Always too anxious, always feel very much things do not very comfortable. Still want to calm down to think carefully, spend more time to

[Life Bitter short PYTHON song] -- PYTHON functional programming 03, python03 Python Recursion If a function calls itself internally, this function is a recursive function; The following is a classic example: Using Python Recursion to find factorial