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Python Introductory Workshop

Abhimanyu Hans

Data Services Assistant at GIS and Data Labs

UMD Libraries

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Link to GitHub Workshop Repository

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Who We Are: GIS and Data Lab at UMD Libraries

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Other Upcoming Workshops

GIS

  • ArcGIS Pro
  • ArcGIS Online and StoryMapping
  • ArcGIS Experience Builder OpenSource
  • GIS: QGIS ArcGIS Dashboards
  • Map Tour with Jim
  • Geo-AI

Data Science/Viz

  • Python
  • Tableau
  • R
  • NVivo
  • PowerBI
  • SQL

Library calendar for all workshops

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Agenda

  1. Python Background
  2. Jupyter Notebooks
  3. Syntax Introduction

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Attendees Survey Alert!

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Python Background

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Why Python?

  • Growing popularity
  • Ease of understanding and use
  • Used in variety of projects
  • Open source community => Out-of-box libraries for most things
  • Basically, perfect (first) programming language to begin with

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TIOBE Programming Community Index

Source: https://www.tiobe.com/tiobe-index/

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Where is Python Used

  • Data science
  • Web Development
  • Data Engineering Pipelines
  • Scientific Computing
  • ML/AI
  • Gaming

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Python Installation

Instructions shared via email

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Install Python

Please follow the link below to download and run the installer. We will be using the Anaconda distribution of python

  • Windows
  • MacOS
  • Others

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Integrated Development Environment (IDEs)

  • IDEs facilitate the process of writing code into a text file
  • Includes many features such as autocomplete, syntax highlighting, linting (error detection), etc.
  • Notepad, VS Code, Jupyter Notebook, Spyder, IntelliJ, etc.

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Jupyter Notebooks

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Jupyter Notebooks

  • Simple and basic
  • Offers interactive code execution (hence used in data science scripts which requires explorative work)
  • Code is executed in “Cell-by-Cell” manner
  • Offers two types of cell viz.
    • Code: for python commands
    • Markdown: for documentation (like HTML)

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Getting Started with Jupyter

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Syntax Introduction

Running Example:

1. Solving quadratic equation

2. FizzBuzz Problem

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Variables vs Literals

  • A Variable is a location that is named in order to store data while the program is being run
  • The data which is being assigned to the variables are called as Literal.
  • Syntax to assign literal value to a variable using assignment operator (=)

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Basic Data Types

  • Int
  • String
  • Float
  • Bool
  • None

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Variable Manipulation: Mathematical Operations

  • Addition
  • Subtraction
  • Division
  • Multiplication
  • Exponentiation

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Variable Manipulation: String Operations

  • Concatenation (i.e join string)
  • Length of string

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Collection Data Types

  • List
  • Tuple
  • Dictionary
  • Set

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List Declaration:

Variable Declaration + Square Brackets

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List Concatenation / Join (½)

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List Concatenation / Join (2/2)

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List Append

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List Sorting (½)

[-122, -19, 23, 30, 53, 100, 100.05]

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List Sorting (2/2)

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Dictionary

  • Contains key-value pairs
  • Each key is mapped to a value
  • Data for each key can be retrieved from dictionary
  • Keys are unique in a specific instance of dictionary

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Dictionary Declaration

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Dictionary Retrieve Data Using Keys

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Dictionary: Add key-value pair in existing dict

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Functions

  • A function is a block of code which only runs when it is called.
  • You can pass data, known as parameters, into a function.
  • A function can return data as a result.

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Simple Example of Function

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Function (Contd.)

  • Functions ensure we can re-use the logic of a piece of code and able to functionize them
  • They are basically to enable automation

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Quadratic Formula via Function

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Boolean Operators

  • Any operator that computes a boolean value i.e. True or False
  • Usually they compare 2 (or more values)
  • For example, greater than, greater than or equal to, equal to

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Equal To, Greater Than, Greater Than Equal To, etc.

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Conditionals: If/Else

  • If/Else is the medium to execute different lines of code based on some logical condition
  • It is present in all programming languages in some form.

Remember, not ALL If/Else have ELSE block present.

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If / Else Example: Odd or Even Number

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For Loop

  • For loop is used when we need to same process (i.e. do operations) on a number of elements
  • It saves the programmer from writing same code multiple times

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For Loop: Printing elements of a List

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FizzBuzz Problem

  • Print the following for all numbers from 1 to 100:
    • If the number is divisible by 3, print ‘Fizz’
    • If the number is divisible by 5, print ‘Buzz’
    • If the number is NOT divisible by 3 or 5, then print the number itself

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Feedback Survey Alert!

Thank you! :-)