Python

The size range of the bigint supported is: 19-bit, save phone number. Signed range: 9223372036854775808 to 9223372036854775807The number ranges supported by INT are: 10 bits, signed range: 2147483648 to 2147483647 unsigned range: 0-4294967295mysql>

Python asks two text files to code with the intersection of the behavioral units and the set of differences: S1 = set (' A.txt ', ' R '). ReadLines ()) s2 = set (open (' B.txt ', ' R '). ReadLines ()) print ' ins:%s '% (

ImportDis,time#Anti-AssemblyImportThreadingdefrequest ():Print('Start Request') v=yield Print(v)defTarget (func):Try: S=time.time ()Print('Start Target') C=func () c.send (None) time.sleep (7) C.send (f'Done : {time.time ()-S}')

1. Tuples(1) Tuples look like lists, but are identified using parentheses instead of square brackets. Once you have defined a tuple, you can use the index toAccess its elements just as you would access a list element.(2) The elements of a tuple

The computer can not only handle a variety of values, but also can deal with text, graphics, audio and video, Web pages and other data, different data, need to define different data types. The types of data that can be processed directly in Python

The __call__ object is appended with parentheses to trigger execution.That is: Object () or Class () ()classDog (object):def __init__(self,name): Self.name=namedefEat (self):Print("%s is eating%s"% (Self.name,'SS')) defTalk (self):Print("%s is

The characters are stored in memory, some are stored in the hard disk, the file also has the method of adding and pruning, open () method, read () method, ReadLine () method, close () file closed, write () write method, Seek () pointer move method,

#1, implement the registration function#输入: Username, PASSOWRD,CPASSOWRD #最多可以输错3次 #3个都不能为空 #用户名长度最少6位, maximum 20 bits, user name cannot be duplicated #密码长度最少8位, maximum 15 bits #两次输入的密码要一致 #注册成功之后, write to the file.#2, login

Python custom exceptions and aggressive throw exceptions#知识点: How to Customize Class MyException (Exception): #让MyException类继承Exception def __init__ (self,name,age): Self.name = name self.age = agetry: #知识点: To

Method 1.urllib.urlopen (Url[,data[,proxies]) in the Urllib moduleOpens a URL method that returns a file object, which can then be manipulated like a file object. This example tries to open Google>>> import urllib>>> f = urllib.urlopen (' http://www.

installation of Python1. Go to Python's website (https://www.python.org/downloads/)2. Point downloads------>windows (here is the system to choose your computer, now the majority of computers are all Windows systems, I use Windows system example)2.

OS ModuleThe OS module is simply a python system-programmed operating module that can handle files and directories that we manually need to do on a daily basis.You can view the Help documentation for the OS module:import os: #导入os模块help(os): View

In Python, is and = = can compare two objects, but their differences are:1. Is through the ID () function to determine whether two objects are equal, = = to determine their values>>> a = 126; b = 126>>> a is b // a和b同时赋给126，id相等True>>> a = 257; b =

Rookie chews the basics of Python to continue.First, return functionThe third chapter has simply manipulated Python's higher-order functions, and continues to practiced hand functions as the return value of the effect; Generally, higher-order

1. Installing Pywin32 and Pyinstallerpip install pywin32pip install pyinstaller2. Write a service Demo#-*-Coding:utf-8-*-import sysimport timeimport win32apiimport win32eventimport win32serviceimport Win32serviceutilimport servicemanagerimport

Conclusion:xxx.yyyy A yyyy can be a class, a class object, a function, a variable can be a package, a module, a classCode:ref1.py# -*-coding:utf-8-*- Import OS class ABCCC (object): def f (self,a): Print = = = 5 def f (a): print

#Coding:utf-8 fromBs4ImportBeautifulSoupImport TimeImportThreadingImportRandomImporttelnetlib,requests#set the global time-out to 3s, that is, if a request is not responding within 3s, end the access and return timeout

Increase1) Append: add element. Added to the last one.Stu_name = [' Zhang San ', ' John Doe ', ' Harry ', ' ... ', 1,1.5]Stu_name.append (' Zhao Liu ')#list add elements inside. Added to the last one. Print (Stu_name)2) Insert: Inserts into the

Found the problem: when the http://www.126.com automated test login mailbox, always can not locate the login name and password. No matter how to use CLASS,XPATH,ID,CSS, etc. are not. After careful review, only to find this landing embedded, that is,

Apply both while and for nested loops for beginners to see x = 1while x : Y = 1 while y x: print (Y, " * ' , X, ' = ' , X*y,end= execution Result: 1 * 1 = 1  1 * 2 = 22 * 2 = 41 * 3 = 32 * 3 = 63 * 3 = 91 * 4 = 42 * 4 = 83 * 4 = 124 * 4 =