CODEWITHSUNDEEP
pythonturtle-graphics
royce.lee
royce.lee

Reputation: 19

Can't assign to literal in Python turtle

I am python beginner and when I type in this code the error says "can't assign to literal" how do I fix this?

from turtle import*
from math import*
def triangle(): 
   triangle=(int(bodylength))/5*3/2/cos(70)
   penup()
   forward(int(bodylength)/5)
   pendown()
   left(70)
   forward(int('triangle'))
   right(140)
   forward(int('triangle'))
   forward(int(bodylength)/5)
triangle()

Upvotes: 0

Views: 237

Answers (3)

cdlane
cdlane

Reputation: 41872

Although changing forward(int('triangle')) to forward(int(triangle)) is necessary, it's not sufficient as bodylength is undefined. Let's rework it to get make the code clearer and run:

from turtle import Turtle, Screen
import math

def triangle(turtle, bodylength):
    distance = bodylength / 5 * 3 / 2 / math.cos(math.radians(70))
    turtle.penup()
    turtle.forward(bodylength / 5)
    turtle.pendown()
    turtle.left(70)
    turtle.forward(distance)
    turtle.right(140)
    turtle.forward(distance)
    turtle.forward(bodylength / 5)

screen = Screen()

yertle = Turtle()

triangle(yertle, int(input("Body length: ")))

screen.exitonclick()  # depending on the environment, you may not need this

Upvotes: 1

Pythogen
Pythogen

Reputation: 640

intead of using 'triangle' use just triangle

so your code will look like this:

from turtle import*
from math import*
def triangle(): 
   triangle=(int(bodylength))/5*3/2/cos(70)
   penup()
   forward(int(bodylength)/5)
   pendown()
   left(70)
   forward(int(triangle))
   right(140)
   forward(int(triangle))
   forward(int(bodylength)/5)
triangle()

You need to do this because 'triangle' to python is a String not a variable. To find out more about variables and strings, just google what is the difference between strings and variables

Note: Looks like there may be other errors to your code like forward(). You might need to call turtle.forward() or something. And I also think that Math.cos() takes rad instead of deg for the parameter.

Upvotes: 0

Joseph Sible-Reinstate Monica
Joseph Sible-Reinstate Monica

Reputation: 48572

The problem is your statement 'triangle'=(int(bodylength))/5*3/2/cos(70). You can't set a string literal to be equal to something else. If you meant for that to be a variable, you need to remove the quotes from around it. Also, you shouldn't have a variable with the same name as a function.

Upvotes: 0

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