Exercise 1: Hello Turtle

Course 67101 -- Introduction to Computer Science, HUJI, Semester A 2021 Due: 20/10/2021 at 22:00

Objectives

Practice working with functions and the turtle module. Additionally, practice using the print function.

Setup

Import the turtle library at the top of your file hello_turtle.py:

import turtle

Important Turtle Functions

File Structure

• Parts A-D: write in hello_turtle.py
• Part E: write in math_print.py

# These next lines draw a triangle

Example

def intro_example():
    """This is only an example method for printing hello"""
    print("hello")

Part A: Drawing a Petal

Implement the function draw_petal which draws a single petal by performing these steps:

1. Move forward 30 steps
2. Turn right 45 degrees
3. Move forward 30 steps
4. Turn right 135 degrees
5. Move forward 30 steps
6. Turn right 45 degrees
7. Move forward 30 steps
8. Turn right 135 degrees

Part B: Drawing a Flower

Implement the function draw_flower which draws a single flower:

1. Turn left 45 degrees
2. Draw a petal (call draw_petal)
3. Turn left 90 degrees
4. Draw a petal (call draw_petal)
5. Turn left 90 degrees
6. Draw a petal (call draw_petal)
7. Turn left 90 degrees
8. Draw a petal (call draw_petal)
9. Turn left 135 degrees
10. Move forward 150 steps

Part C: Drawing a Flower and Advancing

Implement the function draw_flower_and_advance which draws a flower and moves the turtle to enable drawing additional flowers:

1. Draw a flower (call draw_flower)
2. Turn right 90 degrees
3. Lift the pen (turtle.up())
4. Move forward 150 steps
5. Turn right 90 degrees
6. Move forward 150 steps
7. Turn left 90 degrees
8. Lower the pen (turtle.down())

Part D: Drawing a Flower Bed

Implement the function draw_flower_bed which draws three flowers:

1. Lift the pen
2. Move forward 200 steps
3. Turn left 180 degrees
4. Lower the pen
5. Draw three flowers by calling draw_flower_and_advance three times

Running the Functions

Use the following format at the bottom of your file:

if __name__ == '__main__':
    draw_flower_bed()
    turtle.done()

Part E: Print Practice (math_print.py)

In this part, write functions that practice using the math module. Add at the top of math_print.py:

import math

def sin_30():
    print(math.sin(30))

def tan_50():
    print(math.tan(50))

def cos_86():
    print(math.cos(86))

Functions to Implement

1. golden_ratio -- prints the golden ratio
2. six_squared -- prints the result of 6^2
3. hypotenuse -- prints the length of the hypotenuse of a right triangle with sides 12 and 5
4. pi -- prints the value of pi
5. e -- prints the value of e
6. squares_area -- prints the areas of squares with side lengths 1 through 10 (ascending order), separated by spaces

def squares_area():
    print(4*1, 4*2, 4*3)

Running the Functions

if __name__ == "__main__":
    golden_ratio()
    six_squared()
    hypotenuse()
    pi()
    e()
    squares_area()

Part F: Running Tests (Pre-Submission)

After your first submission, you will receive feedback indicating a failed test. To complete this part:

1. Open the feedback file
2. Find the required filename and string
3. Create a new file with that name
4. Add a function called secret_function that prints the specified string

Submission Instructions

Files to Submit

1. hello_turtle.py
2. math_print.py
3. The file containing secret_function (from Part F)

Creating the ZIP File

Create a zip file named ex1.zip containing exactly the three files above.

Linux:

zip ex1.zip hello_turtle.py math_print.py

Windows: Select the files, right-click, choose "Send to" then "Compressed (zipped) folder".

Write the names of students you consulted with as a comment at the top of hello_turtle.py.