Python

The SYS module includes a very useful set of services, including a number of function methods and variables, to handle Python runtime configuration and resources so that it can interact with system environments other than the previous program, such

Multiprocessing Module IntroductionMultithreading in Python does not take advantage of multicore advantages, and if you want to fully use the resources of multicore CPUs (Os.cpu_count () Viewing), most of the situations in Python require multiple

is and the difference between = =is to compare memory addresses= = Comparison is a valueID (variable) returns the memory address of this variable to youExample: s= "Jay Chou"S1=sPrint (ID (s), ID (S1))Special: lst1=[1,4,7]lst2=[1,4,7]Lst1.append

#-*-coding:utf-8-*- ImportSmtplib fromEmail.mime.textImportMimetext fromEmail.headerImportHeader#third-party SMTP servicesmail_host="smtp.qq.com" #setting up the serverMail_user="QQ number @qq.com" #User namemail_pass="password for the

Turn a picture into a string via PythonFunny, funny, see a friend of that page's picture, I think about it, or get a skin kachuluThe picture is as follows:The picture name is ccc.jpg code inside can changeThe code is as follows:#--coding:utf-8--

View the version and installation location of Python and NumPy under the command line1. View Python versionMethod One:Python-vNote: '-V ' in uppercase, only one '-'Method Two:Python--versionNote: There are two '-' in '--version '2. View Python

The context Manager enables allocation and deallocation of resources by using more readable and streamlined codeThe most common use of the context manager is with the WITH statement, which constructs the allocation of resources and the release of

Enabling the WinRM service on the Windows platformThe WinRM service is not enabled by default, the status is checked first, and if there is no return information, it is not started;enumerate winrm/config/listenerBasic Configuration for WinRM service:

implementation of a requirementCurrently, we have a small requirement: To calculate the time of the function execution through the adornerCalculate the execution duration of this functiondef add (x, y): # add = Timeit (add) time.sleep (1) ' This is

__getattr__Called when a class attribute is not foundClass Beimenchuixue: def __init__ (self, name): self.name = name def __getattr__ (self, item): print ("% s not find ", item) Raise Exception (" instance method not found

1. List, String, TupleList and string are similar, can use [index],tuple also can use [index],strign cannot change, we know, need to notice that the tuple is also immutable (immutable), such as:A =[1,2,3]print# 1"test"print # T = (11,22,33)print#

Today I learned the first day of Python . Today mostly the data types are spoken. Contains int, float, string, list, bool, and loop. If you want to see the type of a variable you can use:print (type(variable name))The data type can also be cast.

In Java programs sometimes you need to call Python's program, you can use the general pyfunction to invoke the Python function and get the return value, but in this way there may be some inexplicable errors, such as Importerror. Another way to do

If there is a Python dictionary my_dictRemove all keys from the dictionary: key_list = My_dict.keys () returns the listRemove all values from the dictionary: value_list = my_dict.values () returns the listTo traverse a dictionary:For I in

Dictionary: Key-value pairs exist. Key valuestu={ ' Name ': ' Zhangsan ', ' Gender ': ' femanl ', ' Age ': 17}Print (STU)#增加字典值stu["Score"]=87Stu.setdefault (' dictinct ', ' Nanshan ') #已经存在就不添加 sstu.update (xx)

1 #and check the realization of the Set2 classNode:3 Pass4 5 classUnionfindset:6 def __init__(self, nodes):7Self.fatherdict =dict ()8Self.sizedict =dict ()9 forNodeinchnodes:TenSelf.fatherdict[node] =node OneSelf.sizedict[node] = 1

Capitalize first letter" Alex " = test.capitalize ()print(v)All lowercase, the first is a lot better, many unknown correspondence can be changed to lowercaseTest/casefold ()Test.lower ()Set the width, and put the text in the middle, 20, for total

Useful information methods for obtaining functions within adorners. __doc__ used to get function comment information. __name_ used to get the name of the functionWhen a function references an adorner, the function name becomes the name of the

Python implementation of Leecode primary algorithm--array#-*-Coding:utf-8-*-"" "@Created on 2018/6/3 17:06@author:zhifengfang" "" # Permutation array Delete duplicates def removeduplicates (nums): if Le N (nums) 1:k = k% len (nums) if k! = 0:temp =

File Read and write:With open (R ' F:\test\t1.txt ', ' R ') as F:Print F.read () readF.close () offwith equivalent try...catch;Read by line:With open (R ' F:\test\t1.txt ', ' R ') as F:For L in F.readlines ():Print L.strip ()F.close ()Write