python learning 11: detailed explanation of Python tuple

Tuples are another important sequence structure in Python. Similar to lists, tuples are also composed of a series of elements sorted in a specific order. Unlike a list, a list can operate on any element and is a variable sequence, while a tuple is an immutable sequence, that is, the elements in the tuple cannot be modified separately. Tuples c ...

Posted on Thu, 17 Oct 2019 01:52:01 -0400 by manishdugar

Getting started with Python crawler [8]: the third picture of hummingbird Web

Hummingbird net picture The capacity of the previous tutorials is relatively large. Today I write a relatively simple one. It's a hummingbird. I still use aiohttp. I hope you like it.Crawl page` https://tu.fengniao.com The front process is still based on the purpose of learning. Why do I choose hummingbirds? I can't help it. I chose it blindly ...

Posted on Wed, 16 Oct 2019 19:27:06 -0400 by cedtech31

Comprehensive strategy of deep learning configuration environment

Comprehensive strategy of deep learning configuration environment 1. Install pycharm Download the community version on the official website 2. Modify apt get source sudo apt-get update sudo apt-get upgrade cd /etc/apt/ # Backup source sudo cp sources.list sources.list.bk # Replace the original wit ...

Posted on Wed, 16 Oct 2019 17:28:24 -0400 by PhpMachine

pandas grouping and aggregation

Pandas grouping and aggregation Group by Data sets are grouped and then statistically analyzed SQL can filter and aggregate data. pandas can use groupby for more complex grouping operations Group operation process: split - > apply - > combine Split: basis for grouping 2. Application: calculation rules for each group 3. Merge: merge ...

Posted on Wed, 16 Oct 2019 14:49:44 -0400 by hoogeebear

MySQL command line artifact: Mycli

Mycli is a MySQL command-line client tool, which has automatic completion and syntax highlighting functions. It is a tool developed by Indians based on python. It is suitable for beginners or people who are familiar with database but can't remember commands. It can overcome the difficulty of not remembering commands. Official website: ht ...

Posted on Wed, 16 Oct 2019 13:26:53 -0400 by meltingpotclub

Using procedure to insert data in batches

text                                                  DROP TABLE IF EXISTS `operationlog`; CREATE TABLE `o ...

Posted on Wed, 16 Oct 2019 10:37:09 -0400 by dsainteclaire

Creation and data type of numpy

N Dimension Array NumPy array is a multidimensional array object (matrix), which is called ndarray. It has the ability of vector arithmetic and complex broadcast, and it has the characteristics of fast execution and space saving. Note: the subscript of ndarray starts from 0, and all elements in the array must be of the same type Properties own ...

Posted on Wed, 16 Oct 2019 08:14:36 -0400 by jackliu97

Numpy ﹣ ndarray element calculation function

Element calculation function ceil(): the closest integer up, with the parameter number or array floor(): the down nearest integer with the parameter number or array rint(): round, parameter is number or array isnan(): determine whether the element is NaN(Not a Number), and whether the parameter is number or array. multiply ...

Posted on Wed, 16 Oct 2019 08:14:25 -0400 by tisource

Python develops exclusive wallpaper download and rotation program

I have always been partial to Buddhism for wallpaper, do not like to go to a pile of wallpaper. So we simply download wallpaper automatically in Python. The function of regular random rotation comes from entertainment and sharing it with you. Original link: https://www.codernice.top/articles/9f79c65e.html Get ready Download and install Python 3 ...

Posted on Wed, 16 Oct 2019 02:51:26 -0400 by mickey9801

500 lines of code, teach you to write a wechat airplane battle with python

In recent days, I've been reviewing the airplane battle of wechat games, and I'm thinking about my life while playing. How can this airplane battle be done so well? It's easy to operate and get started. Help squatting toilet, YP and rice circle girls have one thing to cheer them up when they are bored! Let their left / right hand move rhythmic ...

Posted on Tue, 15 Oct 2019 17:57:19 -0400 by sickness01