zhehaowang

Clean architecture

Part 1

Goal

Goal of architecture: to minimize human resources required to build and maintain the required system

A good indication of a badly designed system: look at the cost of each line of code, and the productivity of each engineer over time

zhehaowang

#!/usr/local/bin/python3

def ipPrefixRange(addr, start, end):
    """
    @param  addr     valid String of ip address e.g. 192.168.0.0/16
    @param  start    int range to start iteration from
    @param  end      int range to end the iteration with
    @return [String] list of string of possible prefixes between start and end
    """
    assert start <= end

zhehaowang

When Genius Failed

What is Long Term Capital Management (LTCM)

LTCM is a hedge fund founded by the bond arbitrage group from Salomon, plus Nobel laureate economists (Merton and Scholes) from Harvard.

They operated from 1994 to 1998, culminating in $1 turning into over $4 for each dollar invested in 1993 (and a $4.5 billion total capital), and losing it all (each $1 worth 33 cents) in 5 weeks in 1998. The Fed organized a bailout operation to ingest capital to LTCM from major Wall Street banks, out of fear of LTCM collapsing triggering a series of crises.

What does LTCM trade; How do they make money

zhehaowang

"Advocate for yourself. Honestly that's the key to everything here. If you don't, people are going to make assumptions, and such assumptions are usually wrong."
-- Adam

"Regarding career: First, deepen your technical skills, especially transition from a good programmer (which you probably were already in college) to a good engineer (who understands software and systems as a whole, including scalability, maintainability, flexibility, lifecycle, dependencies, risks, ...)
Then, start building out soft skills. These might have the biggest impact on your career in the long run. Like presenting your work, influencing others, mentor people, creativity and innovation ..."
-- Jochen

"I have two kinds of problems, the urgent and the important. The urgent are not important, and the important are never urgent." -- Eisenhower

"No idea is really bad, unless we are uncritical. What is really bad is to have no idea at all."

zhehaowang

#include <iostream>
#include <string>
#include <vector>

struct MyObject {
    MyObject(const char * c) : content(c) {
        std::cout << "default ctor\n";
    }

    MyObject(const MyObject& rhs) : content(rhs.content) {

zhehaowang

import os
import glob
import csv
from xlsxwriter.workbook import Workbook

for csvfile in ["out.csv"]:
    workbook = Workbook(csvfile[:-4] + '.xlsx')
    worksheet = workbook.add_worksheet()
    with open(csvfile, 'r', newline='', encoding='utf-8') as f:
        reader = csv.reader(f)

zhehaowang

#!/usr/bin/env python3

import argparse
import glob
import json
import requests
import os
from json.decoder import JSONDecodeError

# import hack