Daniel van Flymen 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 😎

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:

	class Blockchain(object):
	...

	def new_transaction(self, sender, recipient, amount):
	"""
	Creates a new transaction to go into the next mined Block

	:param sender: <str> Address of the Sender
	:param recipient: <str> Address of the Recipient
	:param amount: <int> Amount

	import hashlib
	import json

	from time import time
	from uuid import uuid4

	from flask import Flask, jsonify, request

	...

	@app.route('/chain', methods=['GET'])
	def full_chain():
	response = {
	'chain': blockchain.chain,
	'length': len(blockchain.chain),
	}
	return jsonify(response), 200

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


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

	...
	import requests


	class Blockchain(object)
	...

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

	@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)

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

	def new_block(self):
	# Creates a new Block in the Blockchain
	pass

	def new_transaction(self):

	function MD5 (input) {
	var digest = Utilities.computeDigest(Utilities.DigestAlgorithm.MD5, input);
	var output = "";
	for (i = 0; i < digest.length; i++) {
	var h = digest[i];
	if (h < 0) { h += 256; }
	if (h.toString(16).length == 1) { output += '0'; }
	output += h.toString(16);
	}
	return output;