rjsnh1522

# Add this to you .zshrc or .bash_rc

alias gst="git status"
alias rns="python manage.py runserver"
alias mmgrt="python manage.py makemigrations"
alias mgrt="python manage.py migrate"
alias csu="python manage.py createsuperuser"
alias shl="python manage.py shell"
alias shlp="python manage.py shell_plus"
alias show_urls="python manage.py show_urls"

rjsnh1522

Git Branching Strategy

Objective:

1. To solve issue of merge conflict of migrations. When deploying if developer has forgot to check in their migrations. 
2. To solve Settings.xlsx conflict to remove duplicate entries and over written values.
3. To not block any new release.
4. Solve merge conflict of hot fix if any database changes is there.

rjsnh1522

from jinja2.lexer import Token
from jinja2.ext import Extension


class ListDictTable(Extension):
    tags = set(['listdicttable'])

    def filter_stream(self, stream):
        variable_done = False
        in_trans = False

rjsnh1522

# To use redis in django
# in settings.py
REDIS = {
    'host': 'localhost',
    'port': 6379,
    'db': 2
}

# make a singleton class and make one redis instance
import redis

rjsnh1522

import os

def caller():
    for (root,dirs,files) in os.walk(os.getcwd(), topdown=True):
        for file in files:
            if file.endswith('.url') or  file.endswith('.txt'):
                print(os.remove(os.path.join(root, file)))
                

rjsnh1522

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

rjsnh1522

Create the directory for the new instance

$ sudo install -o redis -g redis -d /var/lib/redis2

Create a new configuration file

$ sudo cp -p /etc/redis/redis.conf /etc/redis/redis2.conf

rjsnh1522

===================================INSTALL CHROMIUM==============================
# install chromium

$ sudo apt-get install chromium-browser

===================================INSTALL rvm==============================

$ gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
$ \curl -sSL https://get.rvm.io | bash -s stable --ruby	

rjsnh1522

# question
# quertion url
# https://www.hackerearth.com/practice/data-structures/arrays/1-d/practice-problems/algorithm/maximum-of-k-size-subarrays-deque/

# Given an array A of size 'N' and an integer k, find the maximum for each and every contiguous subarray of size k.

# Input :

# First line contains 2 space separated integers 'N' and 'k' .
# Second line contains 'N' space separated integers denoting array elements.