Python

First, the "/" left tilt is a forward slash, "\" Right tilt is a backslash, can be remembered as: Division sign is a forward slash generally for directory separators, UNIX and the web with a forward slash/,windows with backslashes, but now windows(i)

 Python uses multi-threaded and multi-process to get all stock real-time data The previous day briefly introduced how Python obtains historical data and real-time data, so what do you do if you want to get real-time pen data for all listed companies?

We write ordinary script, from a Web site to get a file download URL, and then download, directly write the data to the file or save it, but this needs our own 1.1 points of writing, and repeated utilization is not high, in order not to repeat the

Python is a computer programming language, also known as glue language, can be used in a mixed compilation of C/c++/java and other languages such as libraries. You may have heard of many popular programming languages, such as C , which is very

Concurrency and threading Basic concepts-parallel, concurrencyparallel , parallelDo multiple things at the same time with no interference;For example, at the same time, there are multiple vehicles running on multiple lanes, the concept of

The function of the Sklearn.cross_validation module is to do cross validation as its name implies. Cross validation probably means : for the raw data we want to divide it into train data, part of it into test data. Train data is used for training,

Logging module:The logging module in the standard library, which was used to solve the problem of print interruption when learning thread safety earlier, describes the function of the logging module.logging modules are thread-safe and do not require

The 1th Chapter: Introduction of students to introduce each other Python brief introduction to the new features of PYTHON3 development Tools IDE Introduction HelloWorld program variable and assignment user interaction condition judgment and

Why is the Python function definition default parameter must point to the immutable object?The following is a personal understanding, if there is a wrong place, welcome to discussCause analysis: When defined, the function allocates the memory space

Reprint: Learn to use yourselfA tool to learnPython languageRecommended to see Liaoche's Python3 tutorial.Data Analysis Python Basicssuch as List,tuple,dic,set and so on. My later blog will write.Two get dataPython crawlerRecommend a book: "Python

What we're sharing today is Python's simple client and server, here's just a few simple functions and make a play.Before we get started, let's use a graph to show the relationship between them.650) this.width=650; "Src=" Https://s3.51cto.com/oss/2017

anonymous functionsIf the function value is used once and the structure statement (which requires a single line of expression), an anonymous function can be used. Benefits of anonymous functions: The program is used once, so there is no

The processing of the data is pandas, but it has not been learned and does not know whether there is a method call that is directly normalized to a column. Himself dealing things down. The feeling is still more troublesome.After reading to the array

Event-driven introduction in general, when we write a server process model, there are several models: (1) Each request is received, a new process is created to process the request, (2) Each request is received, a new thread is created to process the

Target task: Use the Scrapy framework to crawl all large categories, small classes, sub-links in small categories, and the news content of the child link page, and finally save to local.The large class is shown in small classes as follows:Click on

Python environment setup-install and use pycharm, python-pycharm Learning URL: -- Cainiao tutorial (2.0 and 3.0) Http://www.runoob.com/python/python-tutorial.html Http://www.runoob.com/python3/python3-tutorial.html -- Pycharm software usage

Python dictionary Value Comparison function example, python example This example describes the dictionary Value Comparison function implemented by Python. We will share this with you for your reference. The details are as follows: # Coding =

Python determines whether the instance is a prime number or a prime number. python Prime Number A natural number greater than 1 cannot be divisible by other natural numbers (prime numbers) except 1 and itself (2, 3, 5, 7, etc ), in other words, this

Socket -- accept big data, socket -- accept dataI. Simple ssh Functions 　　1.1 implement functions In the previous blog, we have implemented a simple small program similar to the Linux Server ssh function. You can enter a system command to return the

Django-rest-framework quick start, The first contact with django-rest-framework was during the internship. I didn't understand it at the time, and it was awesome to see that the view was written using the class method. Because the official website