Python

#-*-coding:utf-8-*-#Connect all txt to one and delete duplicate recordsImportOSImport TimedefBianli (rootdir):Print "Start splicing data, please wait a moment ..."start_time=time.time () FH= Open ('c://users//administrator//pycharmprojects// ALL.txt'

Named functions with parameters that can take one or more parametersFunctions can reduce duplication of code, make programs extensible, and make programs easier to maintainParametric the memory cells are allocated only when they are calledArguments

One, iteratoran iterative object is now known: str list tuple dict set range and file handle. But what is an iterative object? The method of measurement for an iterative object.Method One: Dir (the object being measured) if he contains __iter__,

CapricornOriginal address: http://www.cnblogs.com/yd1227/archive/2011/03/18/1988015.html--------------------------------------------------The random module in Python is used to generate a stochastic number. Here are some of the most commonly used

Front desk form: {% csrf_token%} Background functions:from django.shortcuts import render,HttpResponseimport jsonclass Blog(): def login_in(req): if req.method == ‘POST‘: data = json.loads(req.body) if data[‘user‘] =

One, iterator1, the object can be iterated: the object that can directly act on the For loop is called an iterative object, namely iterable.Common Iteration objects: str, list, tuple, dict, set, rangeMethods for detecting iterative objects:　　1),

# The following variables require you to choose according to your specific situationtitle = [Id,"Project Leader",Project,"Claim for reimbursement","Content of reimbursement items *","Total Cost","Scheduled reimbursement Date","Reimbursement Person","

From selenium import webdriverimport timefrom bs4 Import beautifulsoupurl = "http://www.hsbkos.com/" soup = BeautifulSoup ( ) Soup.findall (' div ', {' class ': ' Objbox '}) Driver = Webdriver. Chrome () time.sleep (1) driver.get (URL) time.sleep (1)

ThreadThreads belong to lightweight processesNote: A process is the smallest unit of resource allocation, and a thread is the smallest unit of CPU scheduling.there is at least one thread in each process. relationship of processes and threads　the

I. Hump naming method :Small hump nomenclature: The first word begins with a lowercase letter, and the first letter of the second word is capitalized, for example Mynane,adogBig hump nomenclature: Each word is capitalized with the first letter, for

1.__init__ (): constructor2.__del__ (): destructor3.print (__doc__): Print description information4.print (dog.__module__): module from class5.print (d1.__class__): Which class the object belongs to6.__call__ (self, *args, **kwargs): Object (), ()

First, function return valueWhen it comes to return values, I'm sure everyone knows that, yes, it's return.The so-called return value can be understood as: the code outside the function to get the execution result of the function, you can use the

Python errors and exception Codes Errors in programs are generally called bugs, which are undeniable. This is almost always a programmer's mistake... A programmer's life is always accompanied by one thing-debugging (error detection and Exception

Python connects the instance code of various mainstream databases and python instances This blog post mainly introduces how to connect Python to various databases and how to use it. Including relational databases:Sqlite, mysql, and

The usage and example of Python advanced recursive functions The author is a snake friend who is addicted to the inability to extricate himself from Python. To improve his skills, he will publish Python's key and interesting examples to a short book.

Example of how Python solves the problem of dropping a ball and finds the sum of the distance of the ball's falling experience. This article describes how Python solves the problem of throwing a ball and finds the sum of the distance of the ball's

How does NumPy generate multi-dimensional arrays? How does numpy generate multi-dimensional arrays? Python is now the most popular AI language. The support of various tools, such as Google's Tensorflow, is the preferred support for Python. However,

Python screen is implemented in two ways: python Screen Use windows APIs Use the ImageGrab module in PIL The following describes the features and usage of the two. I. Python calls windows API to implement the screen The advantage is that

Python: Process pool, python process pool 1. Can a process be opened infinitely? Processes cannot be opened infinitely. The cpu has 16 cores, which means that 16 tasks can be processed simultaneously. If there are 160 processes, each process 0.01 s

9.2 object-oriented: inheritance, polymorphism, 9.2 Polymorphism Related content: Inheritance: Multi-inheritance, super, _ init _, override parent variables or functions Polymorphism   Inheritance: In Python3, the class without writing