Removing array entries in loops

Question

I have a program structure with nested loops, and within the innermost loop, I want to delete certain entries from an array (EdgePixels). However, when I try to delete an entry using del, I encounter the error "List index out of range." The code I'm referring to:

for i in range(len(EdgePixels)):
    for j in range(len(EdgePixels)):
        for k in range(len(EdgePixels)):
            # Now in here I want to delete some Entries from the Array...
            # e.g. I want to remove EdgePixels[5], so:
            del EdgePixels[5]

Executing this gives me the error

"List index out of range"...

My goal is to delete entries from the array in the inner loop while allowing the outer loops to continue running with the updated array (without the deleted entries).

Is there a clean way, to solve this?

MSeifert · Accepted Answer · 2017-01-31 06:19:44Z

1

The easy way would be to ignore indices instead of deleting these elements:

ignore_indices = set()

for i, item1 in enumerate(EdgePixels):
    if i in ignore_indices:
        continue
    for j, item2 in enumerate(EdgePixels):
        if j in ignore_indices:
            continue
        for k, item3 in enumerate(EdgePixels):
            ignore_indices.add(5)

answered Jan 31, 2017 at 6:19

MSeifert

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4 Comments

Gykonik Over a year ago

Okay, thanks! I'll try it and will report my results

Gykonik Over a year ago

Okay, I think, that this part of my program works now! Thanks! Now I have to complete the other part of my program... ;D

MSeifert Over a year ago

You're welcome. Please also don't forget to upvote/accept the answer :)

Gykonik Over a year ago

Ohh, sorry! Thanks for the reminder, now I did it :)

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