vijaysharmay

The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

• "Build tools for others that you want to be built for you." - Kenneth Reitz
• "Simplicity is alway better than functionality." - Pieter Hintjens

vijaysharmay

import time

def RateLimited(maxPerSecond):
    minInterval = 1.0 / float(maxPerSecond)
    def decorate(func):
        lastTimeCalled = [0.0]
        def rateLimitedFunction(*args,**kargs):
            elapsed = time.clock() - lastTimeCalled[0]
            leftToWait = minInterval - elapsed
            if leftToWait>0:

vijaysharmay

import time
from itertools import islice

def batch(batch_size,batch_frequency):
    def wrapper(func):
        def batch_sizing(iterable):
            for i in range(0,len(iterable),batch_size):
                new = func(islice(iterable,i,i+batch_size))
                time.sleep(batch_frequency)
            return new

vijaysharmay

" enable syntax highlighting
syntax enable

" Color Scheme
set t_Co=256
colorscheme monokai

" show line numbers
set number

vijaysharmay

from fabric.api import *
import os,json
from os.path import expanduser

env.forward_agent = True
USER_DETAILS = os.path.join(expanduser('~'),'userdetails.json')

def commit(message):
    local('git add .')
    local('git commit -m "' + message + '"')

vijaysharmay

# Given a two dictionaries empdesig and empdet containing details about employees and managers in a key value pair - print a hierarchical tree
# empdesig = {'Simha': 'Khan', 'Khan': '', 'Vijay': 'Simha', 'Sai': 'Khan', 'Kiran': 'Kiran'}
# empdet = {'Simha': 'Khan', 'Khan': '', 'Vijay': 'Simha', 'Sai': 'Khan', 'Kiran': 'Kiran'}

# If an employee has manager null(like Khan) or has manager as himself - then they are board members and have no bosses.

for emp,mgr in empdesig.items():
    new[emp] = {key:'' for key,value in empdesig.items() if value == emp}

for k,v in new.items():

vijaysharmay

# Create a new pair
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout myPrivateKey.key -out myCert.pem
chmod 600 myPrivateKey.key

# Create from existing pair
openssl req -x509 -key ~/.ssh/id_rsa -nodes -days 365 -newkey rsa:2048 -out myCert.pem

vijaysharmay

This lists databases:

SELECT datname FROM pg_database
WHERE datistemplate = false;

This lists tables in the current database

SELECT table_schema,table_name
FROM information_schema.tables
ORDER BY table_schema,table_name;

vijaysharmay

"""Splay tree
Logan Ingalls <log@plutor.org>
Sept 3, 2012

Note that I only implemented insert and find. Delete is trivial,
and isn't the interesting part of splay trees. Some of these
algorithms would be simpler, but I chose to do this without parent
links from the tree nodes.

Example output on my desktop computer:

vijaysharmay

[program:hippe]
directory = /home/vijay/Desktop/hippo/hippolite/
user = vijay
command = /home/vijay/Desktop/hippo/hippolite/deploy.sh