xinbinhuang

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xinbinhuang

Raymond Hettinger's professional at doing code review and architecture review

P vs. NP. Pythonic vs. Non-Pythonic.

How to make use of PEP 8

1. Golden rule of PEP-8: PEP-8 onto yourself. PEP 8 is style guide, not a law book.
2. Care about intelligibility, not simply visually better
3. Transforming (Java) API to pythonic ones

Why not PEP 8

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1NF is the most basic of normal forms - each cell in a table must contain only one piece of information, and there can be no duplicate rows.

2NF and 3NF are all about being dependent on the primary key. Recall that a primary key can be made up of multiple columns. As Chris said in his response:

The data depends on the key [1NF], the whole key [2NF] and nothing but the key [3NF] (so help me [Codd][1]).

2NF

Say you have a table containing courses that are taken in a certain semester, and you have the following data:

xinbinhuang

# library() or require() only load one package at a time
# but...

Packages <- c("dplyr", "ggplot2", "rstan", "readr")

lapply(Packages, library, character.only = TRUE)

# this loads as many as you put in 'Packages'. They need to be installed first, of course.

xinbinhuang

Responses to a Hadley tweet:

Is there an equivalent to https://t.co/erZb80L9YY for learning basic (bash) shell commands? (For someone who has never used shell before)

— Hadley Wickham (@hadleywickham) December 3, 2014

<script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>

The thing Hadley was pointing at https://try.github.io/

Erin Ledell suggested http://explainshell.com

Karl Broman suggested http://web.mit.edu/mprat/Public/web/Terminus/Web/main.html