Tutorials
Hands-On Python
Hands-On Python
  • Hands-On Python Tutorial For Real-World Business Analytics Problems
  • Preface
    • Section I. A Note From The Author
    • Section II. Tutorial Overview
    • Section III. What Is The Preflight Checklist?
    • Section IV. Supplimentery Material
  • Preflight Checklist
    • Section V. Select Your Difficulty Setting
    • Section VI. Download Anaconda
    • Section VII. Download PyCharm (Optional)
    • Section VIII. Download SQL Server Developer Edition
    • Section IX. Configure Database Environment
    • Section X. Download The Source Code
    • Section XI. Starting JupyterLab
    • Section XII. How To Get Help With This Tutorial
  • Language Basics
    • Lesson 1. Obligatory Hello World
    • Lesson 2. Code Comments
    • Lesson 3. Data Types
    • Lesson 4. Variables
    • Lesson 5. String Concatenation
    • Lesson 6. Arithmetic Operators
    • Lesson 7. Making Decisions
    • Lesson 8. Control Flow With if-elif-else
    • Lesson 9. Control Flow With while
    • Lesson 10. Data Structures Part I: List
    • Lesson 11. Data Structures Part II: Tuples
    • Lesson 12. Data Structures Part III: Dictionaries
    • Lesson 13. Looping With for
    • Lesson 14. Functions
    • Lesson 15. Importing Modules
    • Lesson 16. Python Programming Standards
  • Advanced Topics
    • Lesson 17. Functional Programing With map
    • Lesson 18. Generators
    • Lesson 19. Comprehensions
    • Lesson 20. Basic File Operations
    • Lesson 21. Working With Data In Numpy
    • Lesson 22. Working With Data In Pandas
    • Lesson 23. Working With JSON
    • Lesson 24. Making File Request Over HTTP And SFTP
    • Lesson 25. Interacting With Databases
    • Lesson 26. Saving Objects With Pickle
    • Lesson 27. Error Handling
    • Lesson 28. Bringing It All Together
  • Solutions To Real World Problems
    • Lesson 29. Download A Zip File Over HTTP
    • Lesson 30. Looping Over Files In A Directory
    • Lesson 31. Convert Comma Delmited Files To Pipe Delimited
    • Lesson 32. Combining Multiple CSVs Into One File
    • Lesson 33. Load Large CSVs Into Data Warehouse Staging Tables
    • Lesson 34. Efficiently Write Large Database Query Results To Disk
    • Lesson 35. Working With SFTP In The Real World
    • Lesson 36. Executing Python From SQL Server Agent
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  1. Language Basics

Lesson 10. Data Structures Part I: List

Most programming languages have the concept of an array. Arrays are sequences of values usually all of the same data type.

Python took the concept of an array and made it much more powerful by creating three different data structures. Each structure has it’s uses which we will explore in later lessons.

In the next three lessons, we are going to talk about how to create these unique data structures and how to work with them. The first structure we are going to talk about is called a list.

A list is the closest structure to a classic array. Arrays have methods that allow you to work with the data stored in them.

Examples

Example #1 Creating List

Unlike simpler data types, list can be created without initial values.

empty_list = []

fighters = ['Eagle', 'Falcon', 'Tomcat']
print(fighters)

Example #2 Adding Values To An Existing List

fighters.append('Lightning II')
print(fighters)

Example #3 Accessing Values In A List

List values are accessed using an index number that represents the position of a value in the list. The index starts at 0 and the last value can be accessed using an index value of -1.

print(fighters[2])
print(fighters[-1])

Now you try it!

Don't copy and past. Type the code yourself!

PreviousLesson 9. Control Flow With whileNextLesson 11. Data Structures Part II: Tuples

Last updated 3 years ago