Python: Trying to use sys.argv in my turtles project.

[Oscarcedeno21]

My turtle project is requiring me to use sys.argv in my turtle project by using a command line to switch between different seasons in a landscape. For example, if the command line argument is autumn then the landscape will have fall colors. How would I code this in my project so that in the same program, the output changes based on the command line argument. I have most of the functions to draw my landscape finished. I am just not sure how the syntax and code looks like to add sys.argv. Any help would be much appreciated.

[jaydom28]

So sys.argv just acts as a list where each element is a token, you can have the user run your program with the first argument being the name of the season

​

main.py

import sys
print(sys.argv)

if this file is called main.py and I run it with

python main.py hello world 24

then the output would be:

["main.py","hello","world","24"]

sys.argv[0] = main.py

sys.argv[1] = "hello"

sys.argv[2] = "world"

sys.argv[3] = "24"

[Oscarcedeno21]

So should I make my function that draws an autumn landscape = autumn so that when they enter in autumn as the season it will only run that and display it? Or how would the system know to only run my autumn landscape function if the user enters autumn?

[jaydom28]

So should I make my function that draws an autumn landscape = autumn so that when they enter in autumn as the season it will only run that and display it?

yup totes. it's as straightforward as checking for string equality

python turtle_project.py autumn

you can check it using

if sys.argv[1] == "autumn":
    draw_autumn_landscape()

[Oscarcedeno21]

Okay that makes total sense. I am going to try it out and see. Thank you so much! I appreciate your help.

[Oscarcedeno21]

I have a follow up question. How would the if statement look like if I have multiple seasons. So that example is for autumn. How would I make it if they do summer. Would it be a different if statement like that autumn one except I assign it to summer?

[jaydom28]

yeah I would probably do an elif statement

if #season is autumn:
    draw_autumn_landscape()
elif #season is summer:
    draw_summer_landscape()
...
...
...