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is directed to never change. That point ' a ', it cannot be changed to point to ' B ', pointing to a list, cannot be changed to point to other objects, but the list itself is variable!After understanding "point to Invariant", how do you create a tuple that does not change the content? It is important to ensure that each element of a tuple cannot be changed.TaskA tuple is defined:t = (' A ', ' B ', [' A ', ' B '])Because t contains a list element, the contents of the tuple are mutable. Can you m

Basic tutorial for getting started with Python (learningPython) -- 4.2Python's count loop body for statement. Another type of loop body structure in Python is the counting loop body for. some statement blocks are executed for a certain number of times through the for loop. the syntax structure is as follows. Another ty

, we also have minus/pide and other functions. at this time, the power of the decorator is reflected. we only need to modify one code, this not only improves the readability of the program, but also saves a lot of work for us to refactor the code in the future. def decorator(F): def new_function(x, y): print("input:", x, y) return F(x, y) return new_function@decoratordef add(x, y): return x + y@decoratordef multiply(x, y): return x * y The above is the content of the

What is an operator?The main description of the Python operator. To give a simple example 1+5 = 6 . In the example, 1 and 6 are called operands, and the "+" number is the operator. The Python language supports the following types of operators: Arithmetic operators Compare (relational) operators Assignment operators logical operators Bitwise operators Member operators Identit

Found a strange phenomenon, my essay on the topic of Python is an inexplicable dozens of of reading, let me a bit embarrassed, in fact, if you want to learn python, you can focus on some public numbers, such as "a Programmer's daily" and " Crazy Sea "and so on, they all have the learning resources of Python, and they will also recommend some high-quality public n

, programprogram, CPython interpreter, C language features, machine language, CPUCPU, machine language, function, C language, CPython interpreterAdvantages:High development efficiencyHigh Cross-platformEasy to debug the programDisadvantages:Low execution efficiencyLearning difficulty: from high to low machine language--Assembly languages--high-level languagesExecution efficiency: from high to low machine language---assembler assembly--high-level language Development efficiency: From low-high mac

.py >bs.txtExecute fileOK, now it's time to see the results. The cat bs.txt > above means to write the results in the back file.The display of the homepageTo change the lookup rule:from urllib.request import urlopenfrom bs4 import BeautifulSouphtml = urlopen("http://www.jianshu.com")bsObj = BeautifulSoup(html)print(bsObj.h1)nameList=bsObj.findAll("li",{"class":"have-img"})for name in nameList: print(name.get_text())A lot more things ~ ~ ~Because this will cause the load on the simple book ser

The origins of Python: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.Python is purely free software, and the source code and interpreter CPython follow the GPL protocol. Python syntax is concise and clear.python version history:Python is now circulating in the market interpreter has Pyt

As a front-end little white, although now able to understand a little Django code, but also to achieve a simple small demand. But I feel that I still have a lot of not understand to feed. For example, __GT, this is greater than the wording of my circle ... So, follow the IMOOC, start with the Python basics ~ Getting started with PythonData type: In

Getting started with Python: three tips on Data Structure This is the first article on Python. It mainly introduces three tips on data structure. Sort: Use the sorted function to sort data. The sorted function sorts the elements in each list in the order of length, size, and English letters. This function is often used

directory. The contents of the file can be empty. The hierarchy is as follows: Parent --__init_.py --child --__init_.py --a.pyb.py So how does python find the module we define? In standard package SYS, the Path property records the Python package path. You can print it out: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Import SysPrint Sys.pat

numeric types?String strings are only + *.#字符串串的拼接S1 = ' a 's2 = ' BC '#print (S1 + s2)#相乘 Str*intName = ' strong '#print (NAME*8)Ix. User interactionUsing the input () function allows us to interact with the computer.Grammar:Content = input (hint message)Here you can get direct access to what the user has entered.Process Control if statementThe first syntax:If condition: #引号是将条件与结果分开.Result 1. # four spaces, or? A TAB key, this is the condition that tells the program full?Result 2. If the cond

. Python has a rich library of extensions that can easily perform a variety of high-level tasks, and developers can use Python to implement the full range of functions required by the application.Python installation:Usually CentOS comes with python2.6If you want to replace it with more than 2.6 version, please refer to the online tutorialThe starter program is usually HelloWorld, and I'm going to have a hel

Getting started with Python: 9 dictionaries 1. definition of dictionaries The feature of the dictionary is that the icon of the dictionary is curly braces, and the elements in the dictionary use key-value pairs. A key-value pair is used as a data item. 2. create a dictionary (1) definition Dict1 = {'Li Ning ': 'Everything is Possible', 'Nike ': 'Just do it', 'ad

Getting Started with Python drawingStudied: https://zhuanlan.zhihu.com/p/34200452Api:https://matplotlib.org/api/pyplot_api.htmlplot.py:#Import the module as take aliasImportMatplotlib.pyplot as PltImportMatplotlib as mplmpl.rcparams["Font.sans-serif"] = ["Youyuan"]#Data List#X-Axis#input_values = [1,2,3,4,5]Input_values = List (range (1024))#Y-Axis#squares = [1,4

From getting started with python (DAY 3 ), Requirement: Write the login interface Enter user name and passwordWelcome information displayed after successful authenticationLock after three wrong attempts There are two types of scripts for this instance, which are slightly different, as shown below: The account number file account.txt is as follows: Sam 123 David 1

all Target=_blankHtml=" "" " fromBs4ImportBeautifulsoupsoup= BeautifulSoup (HTML,'lxml')Print(Soup.select ('. Panel. Panel-heading'))Print(Soup.select ('ul Li'))Print(Soup.select ('#list-2. Element'))Print(Type (Soup.select ('ul') [0]))Get contentText content can be obtained by Get_text ()Html=" "" " fromBs4ImportBeautifulsoupsoup= BeautifulSoup (HTML,'lxml') forLiinchSoup.select ('Li'): Print(Li.get_text ())Get PropertiesOr the property can be passed by [property name] or attrs[property nam

list in a temporary order>>> car = ['BMW','Audi','Toyota','Subaru']>>>Print(sorted (car)) ['Audi','BMW','Subaru','Toyota']>>>Print(CAR) ['BMW','Audi','Toyota','Subaru']You can also pass parameters to the function sorted () If you want to display the list in the reverse order of alphabetical order Reverse=tureFlip ListMethod reverse () anyway list>>> car = [' BMW ', ' Audi ', ' Toyota ', ' Subaru ']>>> car.reverse () >>> print (car) [' Subaru ', ' Toyota ', ' Audi ', ' BMW ']To find the length o

external function, and the variables of the external function always exist, let's take a look at the example below. deffunc (): a=0Print('output variables for external functions:', a)defF1 ():Print('internal function Output variables:', a)returnf1f=func () f ()#The first call prints out "variables for output external functions: 0" and "intrinsic function output variables: 0"F ()#The call will print out the "intrinsic function output variable: 0", including the subsequent calls, the result of th

)print(Q.get ())Print (Q.get ())print(Q.get ())View CodeLast in, first out, stack queue. Lifoqueue ()Import Queueq=queue. Lifoqueue (3) q.put (1) q.put (2) q.put (3)print(Q.get ()) Print(q.get ())print(Q.get ())View CodePriority queue. Priorityqueue ()Import Queueq # priority, the priority is expressed numerically, the smaller the number, the higher the Priority Q.put ((Ten, 'a')) Q.put ((-1,'b ')q.put ((+,'C'))print (Q.get ()) Print (Q.get ()) Print (Q.get ())View Code