Amit Tripathi amitt001

Copy(resume) data from localhost to server:

rsync --partial --progress dump.tar.gz wkalt:wkdump

OOP and Design Pattern:

Association, Aggregation and Composition:

The distinction between aggregation and composition goes to old times for language like C++ where there is manual memory management. For languages with dynamic memory management everything is compositon.

Association: Multiple objects have their own life cycle and there is no owner. Ex teacher and student, independent life cycle.

Functions

List Operations:

++ == extends

:+ == append

REST Design Important Points:

Use Nouns but no Verbs

Ex: /cars, /cars/23 ... Correct

/getCarData, /get/car/data ... wrong

GET method & query parameter should not alter the state use PUT, POST and DELETE for changing the state
Do not mix up singular and plural nouns use only plural nouns

	Subprocess:

	One class Popen and others are wrapper over it.
	shell=True: This argument spawns a new intermediate process and run the command. If False, the command run in current process.

	Popen: non blocking

	subprcess call vs Popen:

	call: is a wrapper over Popen and takes all the pamaters of popen. It is blocking and does not return until process has finished.

	/*
	STRING OPERATIONS
	package strings
	*/
	exStr := "Hello World"
	strings.Contains(exStr, "lo") //returns true/false
	strings.Index(exStr, "lo") //returns 3
	strings.Count(exStr, "o") //returns 2
	strings.Replace(exStr, "l", "_", 3) //here first 3 l's is replaced with _
	strings.Fields(exStr) //splits on space

	{"size": null,
	"topchart_rank": [1, 9, 1],
	"reviewers": [28360326, 28393897, 28412320],
	"istop_developer": true,
	"app_update_date": {"$date": 1436918400000},
	"screenshots": ["https://lh3.googleusercontent.com/MMue08byixTw74ST_VkNQDUUJBgVEbjNHDYLhIuHmYhMIMJIp3KjVlnhhqZQOZUtNt8=h310"],
	"app_name": "WhatsApp Messenger",
	"category": ["Communication"],
	"ratings": [4.4, 4.4, 4.4, 4.4],
	"min_osversion": "2.1 and up",

	All the sentiment analysis data is present in the folder named "senti"
	Directory structure:

	senti
	├── Trainingset_creator
	│ ├── README.rst
	│ ├── appsid
	│ ├── reviews_crawler.py
	│ └── settings.py
	├── config.py