dvf

import hashlib
import json
from textwrap import dedent
from time import time
from uuid import uuid4

from flask import Flask, jsonify, request

...

dvf

import hashlib
import json

from time import time
from uuid import uuid4

from flask import Flask, jsonify, request

...

dvf

@app.route('/nodes/register', methods=['POST'])
def register_nodes():
    values = request.get_json()

    nodes = values.get('nodes')
    if nodes is None:
        return "Error: Please supply a valid list of nodes", 400

    for node in nodes:
        blockchain.register_node(node)

dvf

...
import requests


class Blockchain(object)
    ...
    
    def valid_chain(self, chain):
        """
        Determine if a given blockchain is valid

dvf

import hashlib
import json
from time import time


class Blockchain(object):
    def __init__(self):
        self.current_transactions = []
        self.chain = []

dvf

...
from urllib.parse import urlparse
...


class Blockchain(object):
    def __init__(self):
        ...
        self.nodes = set()
        ...

dvf

import hashlib
import json
from textwrap import dedent
from time import time
from uuid import uuid4

from flask import Flask


class Blockchain(object):

dvf

This is my highly opinionated way of developing with Python locally. Use it, don't use it. But you probably know that it's a PITA to manage different projects with different dependencies targeting different Python versions, and there are different ways of installing Python too:

• Using the interpreters preinstalled in the OS 😵
• Using brew (or apt etc.) 😅
• Using the binaries from www.python.org 😫
• Using pyenv 😎

dvf

from pathlib import Path
from django.core.files.storage import default_storage


def walk_folder(storage, base="/", error_handler=None):
    """
    Recursively walks a folder, using Django's File Storage.

    :param storage: <Storage>
    :param base: <str> The base folder

dvf

What are coroutines?

Coroutines are functions that can be paused. We define them using the async syntax:

async def say_something(what):
    print(what)

But coroutines can't be run directly: