This is an official tutorial published earlier on Ontology Medium blog
Excited to publish it for Habr readers. Feel free to ask any related questions and suggest a better format for tutorial materials

Foreword

• Part 1: Blockchain & Block API
• Part 2: Storage API
• Part 3: Runtime API
• Part 4: Native API
• Part 5: Upgrade API
• Part 6: Execution Engine API
• Part 7: Static & Dynamic Call API

1. How to Use Blockchain API

Have you ever looked for a flat? Would you like to add some machine learning and make a process more interesting?

>>> class A:
...     x = 2
...
>>> A.x
2
>>> A().x
2

As you have already know I love optional static typing. The thing is that sometimes it is not optional, but impossible. Because we have plenty of big untyped projects in Python's ecosystem.

Django and Django-Rest-Framework were two of them. Were. Because now they can be typed! Let me introduce TypedDjango organisation and stubs for django and drf.

This is going to be a concise tutorial and getting started guide.

A memory problem may arise when a large number of objects are active in RAM during the execution of a program, especially if there are restrictions on the total amount of available memory.

Below is an overview of some methods of reducing the size of objects, which can significantly reduce the amount of RAM needed for programs in pure Python.

Note: This is english version of my original post (in russian).

Some days ago the Windows team announced the May 2019 Update for Windows 10. In this post we’re going to look at what we, the Python team, have done to make Python easier to install on Windows by helping the community publish to the Microsoft Store and, in collaboration with Windows, adding a default “python.exe” command to help find it. You may have already heard about these on the Python Bytes podcast, at PyCon US, or through Twitter.

A selection of datasets for machine learning:

• Data deaths and battles from the game of thrones — This data set combines three data sources, each based on information from a series of books.
• Global Terrorism Database — Over 180,000 terrorist attacks worldwide, 1970-2017.
• Bitcoin, historical data — Bitcoin data with an interval of 1 minute from selected exchanges, January 2012 — March 2019

We used to think of Telegram as a reliable and secure transmission medium for messages of any sort. But under the hood it has a rather common combination of a- and symmetric encryptions. Where’s fun in that? And why would anyone trust their private messages to a third-party anyway?

TL;DR — inventing a private covert channel through users blacklisting each other.

We are pleased to announce that the April 2019 release of the Python Extension for Visual Studio Code is now available. You can download the Python extension from the Marketplace, or install it directly from the extension gallery in Visual Studio Code. You can learn more about Python support in Visual Studio Code in the documentation.

In this release we made a series of improvements that are listed in our changelog, closing a total of 84 issues including:

• Variable Explorer and Data Viewer
• Enhancements to debug configuration
• Additional improvements to the Python Language Server

Keep on reading to learn more!