Question

PYTHON: Turtle Command Interpreter

You will write a program that reads a sequence of codes, converts them into Turtle commands, and then executes them. The codes are in a Python list, passed as an argument to your function.

turtleRunner(t, x)
t is a Turtle
x is a list of Turtle commands

Code List

(f, d)	Move forward by d pixels
u	Lift pen up
d	Put pen down
(l, d)	Turn left by d degrees
(r, d)	Turn right by d degrees
(c, s)	Change color to "s"
(w, d)	Change pen width to d

For example [("f", 100), ("r", 30), ("c", "red"), "u", ("f", 50), ("r", 60), "d", ("f", 100)] will execute:

t.forward(100)
t.right(30)
t.color("red")
t.penup()
t.forward(50)
t.right(60)
t.pendown()
t.forward(100)

Your program will need to do the following:

1. Define a function named turtleRunner(t, x), where t is a turtle and x is a list
2. Go through each element of x one at a time.
3. If the element is a tuple (if isinstance(e, tuple)):
   1. Determine if the code is f, r, c, or w
   2. Execute the correct turtle command using the second part of the tuple (a distance or color)
4. If the element is a string (if isinstance(e, str)):
   1. Execute the correct turtle command

x = [("w",3),("c","red"),("f",100),("r",120),("c","blue"),("f",100),("r",120),("c","green"),("f",100)]
turtleRunner(t, x)

Draws the shape below:

isinstance(x, y) returns True if x is an instance of class y. So isinstance(e, tuple) will return True if e is a Tuple.
(Note no quotes around tuple in the call)

isinstance(e, str) will return True if e is a String.

Starter code(please by off this):

# Tkinter
#
# Turtle Command Interpreter
#
# You will write a program that reads a list of codes, converts them into Turtle commands, and then executes them.
#
# Code list:
# (f, d) Move forward by d pixels
# u         Up
# d         Down
# (l, d)    Turn left by d degrees
# (r, d)    Turn right by d degrees
# (c, s)    Change color to "s"
# (w, d)    Change width to d
#
# Example:
# [("f", 100), ("r", 30), ("c", "red"), "u", ("f", 50), ("r", 60), "d", ("f", 100)]
#
# This will execute:
# t.forward(100)
# t.right(30)
# t.color("red")
# t.penup()
# t.forward(50)
# t.right(60)
# t.pendown()
# t.forward(100)
#
# Your program will need to do the following:
# 1) Define a function named turtleRunner(x), where x is a list
# 2) Go through each element of x one at a time.
# 3) If the element is a tuple (if isinstance(e, tuple)):
#    a) Determine if the code is f, r, or c
#    b) Execute the correct turtle command using the second part of the tuple (a distance or color)
# 4) If the element is a string (if isinstance(e, str)):
#    a) Execute the correct turtle command
#
import turtle

def turtleRunner(t, x):
    pass

w = turtle.Screen()
t = turtle.Turtle()
x = [("w",3),("c","red"),("f",100),("r",120),("c","blue"),("f",100),("r",120),("c","green"),("f",100)]
turtleRunner(t, x)

Answer 1

import turtle

#Executes all the statements present in list x
def turtleRunner(t, x):
#For loop to access every element of the list
for e in x:
#if element e is tuple
if isinstance(e,tuple):
if e[0] == "f":
t.forward(e[1])
elif e[0] == "r":
t.right(e[1])
elif e[0] == "c":
t.color(e[1])
elif e[0] == "c":
t.color(e[1])
elif e[0] == "l":
t.left(e[1])
elif e[0] == "w":
t.width(e[1])

#if element e is string
elif isinstance(e,str):
if e == "u":
t.up()
elif e == "d":
t.down()

w = turtle.Screen()
t = turtle.Turtle()
x = [("w",3),("c","red"),("f",100),("r",120),("c","blue"),("f",100),("r",120),("c","green"),("f",100)]
turtleRunner(t, x)

#to stop the screen from immediately closing
turtle.done()
------------------------------------------------------------------------------------------

Note: Code has been commented for better understanding.

Code snippet for indentation purposes:

import turtle

#Executes all the statements present in list x
def turtleRunner(t, x):
    #For loop to access every element of the list
    for e in x:
        #if element e is tuple
        if isinstance(e,tuple):
            if e[0] == "f":
                t.forward(e[1])
            elif e[0] == "r":
                t.right(e[1])
            elif e[0] == "c":
                t.color(e[1])
            elif e[0] == "c":
                t.color(e[1])
            elif e[0] == "l":
                t.left(e[1])
            elif e[0] == "w":
                t.width(e[1])

        #if element e is string
        elif isinstance(e,str):
            if e == "u":
                t.up()
            elif e == "d":
                t.down()


w = turtle.Screen()
t = turtle.Turtle()
x = [("w",3),("c","red"),("f",100),("r",120),("c","blue"),("f",100),("r",120),("c","green"),("f",100)]
turtleRunner(t, x)

#to stop the screen from immediately closing
turtle.done()

Output:

----------------------------------------------------------------------------------------

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