Nathan Young nathanhwyoung

Technologies to learn to become a Back End Developer (Python/Django)

Linux - be proficient using Ubuntu for example and the CLI and understand how the shell works, what are environment variables, subshells, processes/tasks, etc...
Docker (and docker-compose) - what are containers and how they work (conceptually) and how to create and run ones
Git - what does version control system mean and how to use Git
RDB (relational databases) - what are relational databases, and understand tables, how to create them and make relations between them as needed... also understand that through SQLite and PostgreSQL (preferred) or MySQL
Python - how to write Python very well and understand its [OOP] implementation...
Virtualenv - And how to create virtual environments for python to isolate it from the system's installed version...
Virtualenvwrapper to manage virtual environments easily

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

Effective Engineer - Notes

By Edmond Lau
Highly Recommended 👍
http://www.theeffectiveengineer.com/

What's an Effective Engineer?

Source

http://www.phy.mtu.edu/~suits/notefreqs.html

Units of Measurement

Frequency: Hz
Wavelength: cm

Based on A4 = 440Hz (equal-tempered scale)

This is a d3.js visualization of US zip codes.

Original zip code dataset from Geocommons.

5MB shapefile with properties such as zipcode, state, name, population, area, more.

http://geocommons.com/overlays/54893 (Thank you Bill Greer)

This converts it nicely:

	# Git
	.git
	.gitignore
	.gitattributes


	# CI
	.codeclimate.yml
	.travis.yml
	.taskcluster.yml

	"""
	Django ORM Optimization Tips

	Caveats:
	* Only use optimizations that obfuscate the code if you need to.
	* Not all of these tips are hard and fast rules.
	* Use your judgement to determine what improvements are appropriate for your code.
	"""

	# ---------------------------------------------------------------------------

	from django.db.models import Count, Max

	unique_fields = ['field_1', 'field_2']

	duplicates = (
	MyModel.objects.values(*unique_fields)
	.order_by()
	.annotate(max_id=Max('id'), count_id=Count('id'))
	.filter(count_id__gt=1)
	)