Grasshopper Python_select item by index

Grasshopper Developer
1

There is three tasks that i wish to achieve in my python script, please guide me test.gh (6.9 KB)

#1 Replace integer by index in the list i had created
e.g. index 0 and -2 to 1

#2 Cull integer by index

#3 Shift the list by one unit
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image.png1417×739 70.7 KB

2

@piac Hey Mate, can u guide me on how to select, replace items in my script?

3

Hi @jia.yeap,

# example list
list1 = [20, 10, 5, 7.5, 12]

# replace item by index
list1[3] = 8  # [20, 10, 5, 8, 12]

# delete by index
del list1[2]  # [20, 10, 8, 12]

# shift list by 1:
list2 = list1[1:]  # [10, 8, 12]

# or delete the first
del list1[0]

But your ghpython input hints need to be set to “List Access” in order for this to work.

1 Like
4

Great input. This works if your list is if you set yr hint. The issue I am encountering is I had performed mathematical equations inside the script and I need to remove first value and last in ‘a’

5

Hi @jia.yeap,
You just need to add one list iteration to your script.
Check the attached file.
test2.gh (10.2 KB)