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2023-08-26

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Lecture 03: Primitive Data Types and Practices (Part I)

Lecture topics

  • Code exploration recap
    • Revisit the following code sample 
      import turtle

t = turtle.Turtle()

t.forward(100)
t.right(90)
t.forward(100)
t.right(90)
t.forward(100)
t.right(90)
t.forward(100)
t.right(90)
turtle.done()
    • Can you plot a different shape?
      • Rectangle
      • Triangle - equilateral triangle
      • Pentagon (homework)
      • Hexagon
  • Numeric Data
    • Common arithmetic operations
      Operation Result
      x + y sum of x and y
      x - y difference of x and y
      x * y product of x and y
      x / y quotient of x and y
      x // y floored quotient of x and y
      x % y remainder of x / y
      -x x negated
      +x x unchanged
      abs(x) absolute value or magnitude of x
      pow(x, y) x to the power y
      x ** y x to the power y
    • Practice
      • How many different numbers can a byte represent?
      • How to tell if an input number is even or odd?
      • Find out all the factors of a given integer
  • String Data (didn't get time to cover)
    • Use different quotation marks
    • Special characters
    • Check the length of a string with len()
    • + and * operators
    • Change the cases with str.lower() and str.upper()
    • String indexing
      • Each character of the string is assigned a index number representing its position in the string, and index number starts from 0
      • General indexing format - StringValue[<lower_index>:<upper_index>]
        • <lower_index> is inclusive
        • <upper_index> is exclusive
        • Negative indexing
      • Practice
        • For an input name, find out the total length
        • For an input name, find out the first and last names
        • Introduce a person based on information input from keyboard
        • Bake a cake!!

Course materials

Topics to explore

Read

We used the Python library turtle and made some fun drawings in our class. Here are some relevant reading for this Python library if you want to learn more and make more interesting shapes with it

  • A quick tutorial on turtle [link]

Exercise

  • Q1: Write a program to draw a regular pentagon with turtle and make sure all five sides are of the same length.
    • Hint: make changes on top of the code samples we used in our class today. Can you figure out the right size of angle to turn in the program?
  • Q2: Allie and Philip were asking how to draw a circle with turtle. Here is one example you could play with. Can you figure out how this code works? 
    # draw a circle with Turtle
import turtle

t = turtle.Turtle()
radius = 100
t.circle(radius)
turtle.done()
  • Q3: Can you figure out a way to draw a shape like this?
    • Hint: maybe you could borrow some logic from Q2 above?