Python

List slices Array Data=[a,b,c,d,e]Print (data[1,3]) #取出b, C,If you use the-number slice is the inverse of the number, then the number to be taken out is data[-3,-1], if it is 0 default is not filledList AppendData.append (c)List InsertData.insert (1

The first two days encountered a problem, the origin is in a packet to see url= this keyword, at that time, at the moment to think there will be ssrf loopholes.In the past, there were many cases of SSRF hitting the intranet and executing commands,

Official document: Namedtuple (): named tuple functions give meaning to each location in a tuple and allow for more readable self-writing code. They can be used anywhere a regular tuple is used, and fields can be added by name instead of by

Both Unicode and ASCII are codes that the machine can understand, and you say that a code appears, and the computer knows what kind of symbol it corresponds to. Because this encoding form will be different characters all and the level of the high

Handling Zerodivisionerror ExceptionsHere is an exception, the divisor is 0 of the exception, we all know that when the divisor is 0 is not operational. Print (5/0)In the above traceback, the error zerodivisionerror already pointed out is an

The print statement can output the specified text to the screen. For example, the output of ' Hello, world ', implemented in code as follows:>>> print ' Hello, world 'Attention:1. When we write code in a python interactive environment, >>> It is a

Python--Counter class I know you'll come, so I'll wait ReferenceOfficial documents Class collections. Counter ([iterable-or-mapping])Counter is integrated into the Dict class, so you can also use the dictionary

The list is functionally equivalent to an array in the C language, which can hold anything, and the basic usage statement is1name = ['A','B','C','D','E']2Name2 = [A]3NAME[0]#Take out the first one4NAME[-1]#Take out the last one .5Name[0:2]#Take out

1.1 Writing an empty file If you write text to a file, you need to provide another argument when calling open (), telling Python that you want to write to the open file ' Txt\myfavoritefruit.txt ' with open (File_path,'w') as File_object:

Python--Enumerate () Python enumerate Again and Again,and to the end Today, a new function enumerate () is encountered, which can be indexed and valued from an iterative object (dict,list,string, etc.), thus avoiding the

1. VariablesDefining a variable will have three characteristics Id,type,valuePrint (ID (age), type [age], age)Name recommended underline (try not to use English too long meaning to understand)Number_of_student2. Uppercase for constants3. Python3

1, while loop implementation output 2-3 + 4-5 + 6 ... + 100 and# use the while loop to implement output 2-3 + 4-5 + 6 ... + 100 and s = = 2 while i : if i % 2 = = 0 :+ = I else: -= I + = 1print (s,i) # operation Result:

For some particular reason, unfortunately, the demyelinating was about to go to the internship, and even the company was selected, but at this juncture. Got the legend of the demyelinating. After a year of accomplishment, I decided to stand up,

4.1 Standard librarylibraries that do not need to be installed, directly imported (path: E:\\autopython\\softinstall\\python3.6.3\\lib)4.1.1 Sys moduleExample 1:#! Author:lanhanImport sys#print (Sys.path) # # #打印环境变量Print (SYS.ARGV) # #

# string FormattingName = input ("Name:")age = Int (input ("Age:"))Job = input ("Job:")Salary = input ("Salary:")If Salary.isdigit (): # To determine if it is a number salary = Int (salary)# Else:# # print ("Please input digit")# # exit

The two programs on the socket network enable the exchange of data through a two-way communication connection, one end of the connection being called a socket. The English literal of the socket is "hole" or "socket". As the BSD UNIX process

Let's take a look at the earliest code:# Coding:utf-8From seleniumImport WebdriverFrom timeImport Sleepdriver = Webdriver. Firefox () Driver.get ("http://blog.hexun.com/") driver.find_element_by_id ("Read_btn"). Click () Driver.maximize_window ()

Python-week3 (based on Python3.0 or above ),1. tuples Tuples are similar to lists. The biggest difference is that you cannot modify them. Therefore, you can call them unmodifiable lists. Brackets are used in the list, and parentheses are used in

Day1.python common data types ----- brief diary, day1.python -----Day1.python common data types ----- brief Diary I · 1. Common data types:Integer, float, Boolean, and plural 2 INTEGER:It is an integer, similar to the BigInteger type of Java, with

Python entered three wrong passwords, user locks, and python three 1. create a new file to store the whitelist users (in the correct format of registered users: username: password), and create a file to store the blacklisted users (users with