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Commit6ebea06

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Initial commit..-- Added Lists Tutorial
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‎.gitignore‎

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venv
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.idea

‎basics.ipynb‎

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{
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"cells": [
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{
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"cell_type":"heading",
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"metadata": {
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"collapsed":true
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},
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"level":1,
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"source": [
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"PYTHON BASICS _ source-nerd"
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]
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},
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{
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"cell_type":"heading",
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"metadata": {},
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"level":2,
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"source": [
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"1. Data Structures in Python\n",
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"\ta. List\n",
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"\tb. Dictionary\n",
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"\tc. Tuples"
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]
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},
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{
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"cell_type":"heading",
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"metadata": {},
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"level":3,
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"source": [
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"1.a. List\n",
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"List literals are written within square brackets [ ]. Lists work similarly to strings -- use the len() function and square brackets [ ] to access data, with the first element at index 0. (See the official python.org list docs.)"
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]
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},
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{
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"cell_type":"code",
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"execution_count":46,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[1, 2, 3, 'xyz']"
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]
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},
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"execution_count":46,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# A Sample List\n",
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"list_data = [1, 2, 3, 'xyz']\n",
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"list_data"
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]
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},
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{
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"cell_type":"code",
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"execution_count":48,
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"metadata": {
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"collapsed":true
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},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"1"
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]
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},
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"execution_count":48,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Elements in a list can be referred by its posotion\n",
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"list_data[0]"
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]
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},
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{
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"cell_type":"code",
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"execution_count":49,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"4"
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]
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},
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"execution_count":49,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Length of the list\n",
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"# The length of the list can be retrieved by using len command followed by list variable name\n",
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"len(list_data)"
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]
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},
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{
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"cell_type":"code",
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"execution_count":50,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"0"
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]
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},
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"execution_count":50,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Index\n",
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"# Index will return the position of the element in the list\n",
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"list_data.index(1)"
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]
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},
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{
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"cell_type":"code",
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"execution_count":51,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[1, 2, 3, 'xyz', 4, 'some_text']"
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]
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},
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"execution_count":51,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Adding new element\n",
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"# Append will append new element at the end of the list\n",
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"list_data.append(4)\n",
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"list_data\n",
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"\n",
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"# You can also use + sign to append elements to the list\n",
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"list_data = list_data + ['some_text']\n",
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"list_data"
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]
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},
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{
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"cell_type":"code",
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"execution_count":52,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[1, 2, 3, 'new_data', 4, 'some_text']"
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]
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},
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"execution_count":52,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Assigning/Replacing values\n",
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"# The position of the element can be used to replace the value of the element\n",
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"list_data[3] = 'new_data'\n",
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"list_data"
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]
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},
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{
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"cell_type":"code",
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"execution_count":53,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[5, 1, 2, 3, 'new_data', 4, 'some_text']"
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]
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},
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"execution_count":53,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Inserting elements at particular position in the list\n",
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"# Use the insert method to insert element at the particular position\n",
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"list_data.insert(0, 5)\n",
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"list_data"
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]
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},
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{
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"cell_type":"code",
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"execution_count":54,
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"metadata": {
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"collapsed":false
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},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[1, 3, 'new_data', 4]"
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]
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},
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"execution_count":54,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Removing elements from a list can either be done by pop, del or remove\n",
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"# pop\n",
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"list_data.pop(0)\n",
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"\n",
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"# del\n",
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"del list_data[1]\n",
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"\n",
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"# remove\n",
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"list_data.remove('some_text')\n",
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"list_data"
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]
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},
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{
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"cell_type":"code",
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"execution_count":55,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[1, 2, 3, 4, 5, 6]"
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]
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},
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"execution_count":55,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Addition of 2 lists\n",
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"list_1 = [1, 2, 3]\n",
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"list_2 = [4, 5, 6]\n",
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"res_list = list_1 + list_2\n",
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"res_list"
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]
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},
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{
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"cell_type":"code",
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"execution_count":56,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[1, 2, 3]"
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]
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},
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"execution_count":56,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Slicing lists\n",
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"# Returns all values before third element\n",
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"res_list[:3]"
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]
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},
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{
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"cell_type":"code",
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"execution_count":57,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[4, 5, 6]"
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]
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},
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"execution_count":57,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Returns all values after third element including the third element\n",
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"res_list[3:]"
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]
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},
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{
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"cell_type":"code",
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"execution_count":58,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[2, 3]"
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]
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},
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"execution_count":58,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Returns all values from 1 to 3 including 1st element and excluding 3 element\n",
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"res_list[1:3]"
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]
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},
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{
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"cell_type":"code",
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"execution_count":59,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"[1, 3, 5]"
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]
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},
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"execution_count":59,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Returns every 2nd element starting from 0\n",
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"res_list[0::2]"
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]
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},
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{
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"cell_type":"code",
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"execution_count":44,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"6"
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]
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},
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"execution_count":44,
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"metadata": {},
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"output_type":"execute_result"
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}
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],
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"source": [
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"# Returns the last element\n",
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"res_list[-1]"
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]
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},
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{
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"cell_type":"code",
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"execution_count":null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name":"Python 2",
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"language":"python",
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"name":"python2"
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},
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"language_info": {
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"codemirror_mode": {
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"name":"ipython",
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"version":2
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},
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"file_extension":".py",
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"mimetype":"text/x-python",
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"name":"python",
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"nbconvert_exporter":"python",
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"pygments_lexer":"ipython2",
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"version":"2.7.6"
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}
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},
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"nbformat":4,
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"nbformat_minor":0
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}

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