Manoj Pandey manojpandey

Attack of Pythons

Among computer programmers, a “gotcha” has become a term for a feature of a programming language that is likely to play tricks on you to display behavior that is different than what you expect.

Just as a fly or a mosquito can “bite” you, we say that a gotcha can “bite” you. So, let's proceed to examine some of Python's gotchas !

Hello, world!

Please explain in detail what will happen if the following program is executed:

#include <iostream>

int main() {
    std::cout << "Hello, world!" << std::endl;
}

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.

	# Install script for opencv
	sudo apt-get update
	sudo apt-get install -y build-essential
	sudo apt-get install -y cmake
	sudo apt-get install -y libgtk2.0-dev
	sudo apt-get install -y pkg-config
	sudo apt-get install -y python-numpy python-dev
	sudo apt-get install -y libavcodec-dev libavformat-dev libswscale-dev
	sudo apt-get install -y libjpeg-dev libpng-dev libtiff-dev libjasper-dev

	#List unique values in a DataFrame column
	pd.unique(df.column_name.ravel())

	#Convert Series datatype to numeric, getting rid of any non-numeric values
	df['col'] = df['col'].astype(str).convert_objects(convert_numeric=True)

	#Grab DataFrame rows where column has certain values
	valuelist = ['value1', 'value2', 'value3']
	df = df[df.column.isin(value_list)]

	#!/usr/bin/env ruby

	require 'aws-sdk'
	require 'json'

	# add credentials here
	akid = ""
	secret_key = ""

	Aws.config.update({

	# RGB to Lab conversion

	# Step 1: RGB to XYZ
	# http://www.easyrgb.com/index.php?X=MATH&H=02#text2
	# Step 2: XYZ to Lab
	# http://www.easyrgb.com/index.php?X=MATH&H=07#text7


	def rgb2lab(inputColor):

	## 1st Sem
	Percentage= 74.69%
	Total Credits Secured= 27
	Credit Percentage= 71.74%
	Marks Obtained= 971/1300
	College Rank= 99
	University Rank= 278

	## 2nd Sem
	Percentage= 69.58%

	Competitions:-

	https://www.kaggle.com/
	https://www.hackerearth.com/

	Books:-

	Introduction to Algorithms By Thomas H Cormen
	Pattern Recognition and Machine Learning By Christopher M. Bishop
	Freakonomics By Steven D. Levitt and Stephen J. Dubner