Access Control Implementation in Solidity Contracts: Ownable | Roles | AccessControl

OpenZeppelin provides three access control modes for smart contracts: the Ownable contract, the Roles library, and the 3.0 new AccelessControl contract.In this tutorial, we will learn about the differences among the three access control modes and how to use them to enhance the security of Solidity contracts in your own ETAI smart contracts. Le ...

Added by netfrugal on Wed, 06 May 2020 00:12:49 +0300

Making classic games with pygame: Gobang

Get ready Basic python preparation: Fundamentals of pygame, refer to Eye Blog's "Write games with Python and Pygame - from getting started to mastering" Install python 3.8.0 to download on python's official website, not to mention more. Install pygame, command: pip install pygame If the installation is slow, you can change the pip so ...

Added by rohithmr on Tue, 05 May 2020 20:13:13 +0300

python actual battle = = = python control keyboard and mouse: pynput

Python control keyboard and mouse: pynput Address: https://pypi.python.org/pypi/pynput   This library allows you to control and monitor input devices. For each input device, it contains a sub package to control and monitor the input device: pynput.mouse: a class that controls and monitors the mouse or touchpad. pynput.keyboard: a class that ...

Added by Stalingrad on Tue, 05 May 2020 05:34:26 +0300

Using keras to build CNN network to identify CIFAR10

brief introduction On the previous blog: Introduction to CNN network in the introduction series of data mining (11.5) In this blog, we will use code to explain how to use keras to build a CNN network to train CIFAR-10 dataset. If you are not familiar with keras, you can take a look Official documents . Or take a look at my previous blog: Int ...

Added by mjohnson025 on Mon, 04 May 2020 06:47:25 +0300

1-8 live lesson python sends email to send attachments and pictures

Send attachment: Find a local file first Open file, read file string Create an object att through the MIMT ext() class, and pass in the file to read the content Add the header information of att and specify the file name Add to MSG message msg.attach(att) attfile = 'test.py' basename = os.path.basename(attfile) fp ...

Added by ajaybuilder on Sun, 03 May 2020 22:28:26 +0300

New Python day 3 (functions)

Creating Python functions def func2(): print('haha') # Return value of function # Return value of function,No return defined None, # There is a return value that returns this object(You can return a function object), # More than one returns a tuple return 0 Calls to Python functions func2() Arguments to Python functi ...

Added by studgate on Sun, 03 May 2020 07:58:40 +0300

json file operation of python

Because it is often necessary to operate on a json format file, it is more difficult to edit the text. I want to write a script to operate on the file, and send the modified file directly to the mailbox The file directory is as follows: drwxr-xr-x 2 root root 4096 12 29 / 16:14 backup -rw-r--r-- 1 root root  168 12 29 / 16:10 config.ini -rw ...

Added by tex1820 on Sun, 03 May 2020 00:01:36 +0300

Python: business card management system (problems occurred after adding login function, asking for advice)

I defined a simple business card management system as a function.. 2 layers. A login interface; A business card management system user interface; The logic is: login succeeded =, jump into the card system user interface, and at the same time, jump out of the login interface, give welcome to use, and the program ends. At this time, the problem i ...

Added by lc21 on Sat, 02 May 2020 16:57:46 +0300

Using Python to uncover how the melon eaters think of Luo Zhixiang's incident

    Preface Recently, the entertainment industry can be said to be bustling. Before, there was a bully president who loved Xiao San, the palace was torn and forced to be a red girl in the net, and after that, there was a sunny boy named Show Luo, who was robbed of his reputation by Zhou Yangqing. It's hard for ordinary people to understand th ...

Added by r_a_s_robin on Sat, 02 May 2020 03:07:36 +0300

Scrape crawls data using phantom JS

Environment: python2.7 + scratch + selenium + phantomjs Content: test summary + phantomjs Crawling content: involving js to load more pages Principle: open middleware in configuration file + modify process ﹣ request function (add phantom JS operation in it) Step 1: settings.py DOWNLOADER_MIDDLEWARES = { 'dbdm.middlewares.DbdmSpiderMiddlew ...

Added by skylert on Fri, 01 May 2020 14:58:08 +0300