Python

Sourcehttps://leetcode-cn.com/problems/intersection-of-two-arrays/Title Description Given two arrays, write a function to calculate the intersection of them.Example:Given num1= [1, 2, 2, 1], nums2 = [2, 2], return [2].Tips:Each element in the

Because the Fasta file format is typically>name1AtgatagtgtctgtagctgactgtAgtgctgtagatagctagctagtc>name2AgtcgatcgtagtagctagctagcAgtcgatgctagctagctacgaaaYou need to identify each line that begins with ' > ' to differentiate each piece of code from the

A variable defined in a subroutine is called a local variable, and a variable defined at the beginning of the program is called a global variable.The global variable scope is the entire program, and the local variable scope is the subroutine that

Python Sort and searchLearn a bit of sorting and search, do a summary. If it's not right there, please give me more advice.Sorting algorithm: is an algorithm that can arrange a string of data in a particular order.stability : A stable sorting

1. Notes and # Numbers　#；#-*-Coding:utf-8-*-;2. Numerical and mathematical calculationsResidual%: "x divided by Y is still remaining J", "100 divided by 16 is 4". The result of the% operation is this part of J;Precedence of Python operations:

Formatting of stringsFormatting is the way that strings are formatted. Use the slot ({}) to format the string sequentially.Formatting methods .format () " {}: The CPU utilization of the computer {} is {}% ". Format ("2018-10-10","C", 10

The python variable is just a label to the object, so when you manipulate the list, List1 = List2 only copies a label and then points to the object, not a new object.There are roughly 5 ways to copy a list:A = [1,2,3,[1]]b= a[:]c= = A *= =

Module: Write code saved as a file. This file is a module. sample.py where the file name Smaple is the module name.Package: A package is a hierarchical file directory structure that defines a Python application execution environment consisting of n

Configparser module:is the module used by the Python standard library to parse the configuration file.Format:Section: Using [] to mark section names: or =: using: or = Assignment[Websv]ip: ' 192.168.1.10 ' port:443name = ' root ' pw = ' root1990 '

shelvepersistence of objects through a module Code import shelveimport numpy as npdef writeObj(name,obj): with shelve.open(‘object‘) as db: db[name]=objdef readObj(name): try: with shelve.open(‘object‘) as db:

一、一级 Directory' d: \file '; for inch os.listdir (path):p rint (Os.path.join (path,filename)) Use Os.listdir to read all the file names under a directory, and then use Os.path.join to combine the directory path and file name to get the file path,

1. Creation of processes frommultiprocessing Import processimport time,osdef Hi (name): Time.sleep (3) Print ("Hello%s"%name,time.ctime ()) Print ("The process number is", Os.getpid ())if__name__=="__main__": forIinchRange3): T= Process

Exercises: Defines a method func, which can introduce any number of integer parameters, and the result returns the largest and smallest values.def func(**args): return max(args),min(args) Defines a method, func, that can introduce any number

Import geventfrom gevent Import monkeymonkey.patch_all () Import timedef func (n): time.sleep (3) print (n) st_ Time = Time.time () gevent.joinall ([ Gevent.spawn (func, 1), Gevent.spawn (func, 2), Gevent.spawn (func, 3),

The Python code is as follows:#Coding=utf-8 fromSeleniumImportWebdriver fromTimeImportSleep fromRandomImportRandintdefauto_throw (username, password):"" " Automatic loopThrowing Bottles"""Driver=Webdriver. Chrome () Driver.get ("https://mail.qq.com")

1 #client and server:2 Most connections are reliable TCP connections. When you create a TCP connection,3 actively initiating a connected call client,4 the passive response connects to the called server. 5 6 ##关于端口7 port numbers less than 1024 are

# _*_ Coding:utf-8 _*___author__ = ' Pythonwu '__date__ = "2018/7/2 14:50"Class A (): def getValue (self): Print (' return value of A ') Def show (self): Print (' I can show A ')Class B (A): def getValue (self): Print ('

In Python, you can add a search path through the SYS module, and Sys.path returns a list of all the default route paths (the search order starts from the subscript zero until the end of the package that needs to be imported)Sys.path.insert

The concept of constants in Python is actually the concept of an object (so-called in Python, where everything is object), and all assignment operations are references to operand objects. In Python, each variable has a unique ID, which can be called

Python can implement multi-threading, but because of the global interpreter Lock (GIL), Python's multithreading can only use one CPU core, that is, only one thread is running at a time, multithreading is just a switch between different threads, and