Unit1-01: Hello, World!

Lesson

• what is the Python programming language?

  • interpreted language (intepreter executes code line by line, one line at a time)

  • cross-platform language

  • free and open source

• read about the Difference between a Compiler and an Interpreter

  • interpreter translates one line at a time. If an error is confronted, it stops. Python, Ruby and Javascript all use interpreters.

  • compiler scans the entire program and converts it into machine code. It will indicate the line(s) where errors occurred, if any. C, C#, C++ and Java all use compilers.

• go over history of Hello, World! program

• try the online Python interpreter Programiz to test and run your code!

• watch "Create Hello, World! in Python3 using Codespaces":

  • when creating folders: 

    • make sure you are in the correct location!

    • make sure they are named identical to the course website structure (i.e. Unit1/Unit1-01)

    • do NOT use any special characters or spaces (i.e. #, !, &, etc.)

  • creating, saving and naming Python files:

    • no spaces or special characters!

    • file extension is ".py"

    • separate words with "_" (i.e. hello_world.py)

    • always create and name the file first, so the IDE knows the language, so it can provide help!

  • use "good laziness" and let the computer help you with Code Completion

  • run your program:

    • ensure you have the python interpreter selected in Codespaces

    • the ▶ button