Podcast
Questions and Answers
What is a common characteristic of good function names in Python?
What is a common characteristic of good function names in Python?
What happens when you call a function with no parameters in Python?
What happens when you call a function with no parameters in Python?
What is the purpose of the pass statement in a function?
What is the purpose of the pass statement in a function?
What is the rule for function names in Python regarding spaces?
What is the rule for function names in Python regarding spaces?
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What is the purpose of the onMousePress function in Python?
What is the purpose of the onMousePress function in Python?
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What is a requirement for function parameters and arguments in Python?
What is a requirement for function parameters and arguments in Python?
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What is the purpose of using the onMouseRelease(mouseX, mouseY) event?
What is the purpose of using the onMouseRelease(mouseX, mouseY) event?
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How do you add 10 to a shape's x-coordinate?
How do you add 10 to a shape's x-coordinate?
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What is the default value of the border property for a shape?
What is the default value of the border property for a shape?
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Which property determines the text of a Label shape?
Which property determines the text of a Label shape?
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What is the purpose of top-level code?
What is the purpose of top-level code?
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How do you set the background color of the app?
How do you set the background color of the app?
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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.
