rohithreddy

Comprehensions in Python the Jedi way

Beautiful is better than ugly. Explicit is better than implicit.

-- The Zen of Python

I frequently deal with collections of things in the programs I write. Collections of droids, jedis, planets, lightsabers, starfighters, etc. When programming in Python, these collections of things are usually represented as lists, sets and dictionaries. Oftentimes, what I want to do with collections is to transform them in various ways. Comprehensions is a powerful syntax for doing just that. I use them extensively, and it's one of the things that keep me coming back to Python. Let me show you a few examples of the incredible usefulness of comprehensions.

All of the tasks presented in the examples can be accomplished with the extensive standard library available in Python. These solutions would arguably be more terse and efficient in some cases. I don't have anything against the standard library. To me there is a certain

rohithreddy

Setup Mesos-DNS

Scripts for setting up

sudo mkdir /etc/mesos-dns
sudo vi /etc/mesos-dns/config.json

rohithreddy

import logging
import uuid
import time

from mesos.interface import Scheduler
from mesos.native import MesosSchedulerDriver
from mesos.interface import mesos_pb2

logging.basicConfig(level=logging.INFO)

rohithreddy

DROP TABLE if exists d_date;

CREATE TABLE d_date
(
  date_dim_id              INT NOT NULL,
  date_actual              DATE NOT NULL,
  epoch                    BIGINT NOT NULL,
  day_suffix               VARCHAR(4) NOT NULL,
  day_name                 VARCHAR(9) NOT NULL,
  day_of_week              INT NOT NULL,

rohithreddy

import org.apache.avro.io.BinaryDecoder;
import org.apache.avro.io.DatumReader;
import org.apache.avro.io.DecoderFactory;
import org.apache.avro.reflect.ReflectDatumReader;
import org.apache.avro.specific.SpecificDatumReader;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.java.typeutils.TypeExtractor;

public class AvroDeserializationSchema<T> implements DeserializationSchema<T> {
	

rohithreddy

{-# LANGUAGE TypeSynonymInstances, DeriveDataTypeable, MultiParamTypeClasses, NoMonomorphismRestriction #-}
-- Ty Levad - [email protected]
-- xmonad.hs

-- Core Modules
import System.Exit
import XMonad hiding ((|||))
import qualified XMonad.StackSet as W

-- Action Modules

rohithreddy

Sometimes you may need an unencrypted pair for your certificate (in my case, I need it for Docker Registry).

You can use OpenSSL to generate one. You will need:

• OpenSSL (if you use Windows, you can get OpenSSL for Windows)
• A certificate in PFX format inputfile.pfx (you can convert from other formats using OpenSSL too). You will of course need its password. It is useless if you do not have it, just throw that file away.

Create (encrypted) key file:

First, you need to create a key file using the following command:

rohithreddy

from __future__ import print_function
import ast


def recurse(node):
    if isinstance(node, ast.BinOp):
        if isinstance(node.op, ast.Mult) or isinstance(node.op, ast.Div):
            print('(', end='')
        recurse(node.left)
        recurse(node.op)

rohithreddy

# First install Chrome, and the Selenium driver
# Next, download and save the MetaMask CRX (there are plenty of guides on how to do this)

from selenium import webdriver
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
import time

rohithreddy

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

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General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules