Python Functions Basics
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Questions and Answers

What is a common characteristic of good function names in Python?

  • They must contain at least one digit
  • They are short and clear (correct)
  • They must start with an uppercase letter
  • They must be at least 10 characters long

    • What happens when you call a function with no parameters in Python?

  • The function will not be executed
  • You must pass a default value
  • You still need to use parentheses (correct)
  • You don't need to use parentheses

    • What is the purpose of the pass statement in a function?

  • To print a message to the console
  • To tell Python to do nothing (correct)
  • To raise an error
  • To exit the function early

    • What is the rule for function names in Python regarding spaces?

    <p>They cannot contain spaces, newlines, or punctuation</p> Signup and view all the answers

    What is the purpose of the onMousePress function in Python?

    <p>To handle mouse click events</p> Signup and view all the answers

    What is a requirement for function parameters and arguments in Python?

    <p>They must match in number and order</p> Signup and view all the answers

    What is the purpose of using the onMouseRelease(mouseX, mouseY) event?

    <p>To modify existing shapes when the mouse is released</p> Signup and view all the answers

    How do you add 10 to a shape's x-coordinate?

    <p>x += 10</p> Signup and view all the answers

    What is the default value of the border property for a shape?

    <p>None</p> Signup and view all the answers

    Which property determines the text of a Label shape?

    <p>value</p> Signup and view all the answers

    What is the purpose of top-level code?

    <p>To run code once before any event is called</p> Signup and view all the answers

    How do you set the background color of the app?

    <p>app.background = 'black'</p> Signup and view all the answers

    Study Notes

    Functions Basics

    • A function's body should be indented by 4 spaces
    • Function parameters can be of different types: numbers, strings, booleans
    • Functions can be called multiple times
    • Python has rules for legal function names: must start with letters, can contain digits, cannot contain spaces, newlines, or punctuation
    • Good function names are short, clear, and camelCased

    Function Parameters and Arguments

    • Parameters and arguments must match in number and order
    • When calling a function with no parameters, use parentheses

    Mouse Events

    • The onMousePress(mouseX, mouseY) function is called every time the canvas is clicked
    • The function name must match the exact name
    • Parameter names can be chosen freely, but represent the x and y coordinates of the mouse press on the canvas

    Using and Debugging Events

    • Use print to understand and debug code
    • Print statements should be removed when no longer needed
    • Use the control or ctrl key to access the inspector

    Top-Level Code

    • Any code not inside a function is top-level code
    • Runs exactly once before any event is called

    Math Operations

    • Use + to add, - to subtract, * to multiply, / to divide

    Globals

    • To modify a shape after creation, store it in a global variable
    • Get and set shape properties in any function

    Mouse Release Events

    • The onMouseRelease(mouseX, mouseY) function is called every time the mouse is released
    • Often used to modify existing shapes

    Shape Properties

    • General shape properties include: position, size, alignment, fill, border, and more
    • Properties can be gotten and set
    • Default values are provided for each property

    Shape-Specific Properties

    • Circle: radius
    • RegularPolygon: radius, points
    • Star: radius, points, roundness
    • Line: x1, y1, x2, y2, dashes, lineWidth
    • Label: value, font, size, bold, italic
    • App background: app.background

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    Description

    Test your understanding of basic functions in Python, including function elements, parameter types, and naming conventions. Learn how to define and call a function in Python.

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