CODEWITHSUNDEEP
pythonlist
Javier
Javier

Reputation: 1141

removing elements incrementally from a list

I've a list of float numbers and I would like to delete incrementally a set of elements in a given range of indexes, sth. like:

for j in range(beginIndex, endIndex+1):
   print ("remove [%d] => val: %g" % (j, myList[j]))
   del myList[j]

However, since I'm iterating over the same list, the indexes (range) are not valid any more for the new list. Does anybody has some suggestions on how to delete the elements properly?

Best wishes

Upvotes: 3

Views: 246

Answers (3)

goedson
goedson

Reputation: 643

Do you really need to remove them incrementaly?

If not, you can do it like this:

del myList[beginIndex:endIndex+1]

Upvotes: 9

pythonquick
pythonquick

Reputation: 10849

You can iterate from the end to beginning of the sequence:

for j in range(endIndex, beginIndex-1, -1):
    print ("remove [%d] => val: %g" % (j, myList[j]))
    del myList[j]

Upvotes: 2

SilentGhost
SilentGhost

Reputation: 319571

Something like this?

>>> list1 = [1,2,3,4,5,6]
>>> start, end = 2, 4
>>> list1[:start] + list1[end:]
[1, 2, 5, 6]

Upvotes: 1

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