python : list index out of range error while iteratively popping elements

by

You are reducing the length of your list l as you iterate over it, so as you approach the end of your indices in the range statement, some of those indices are no longer valid.

It looks like what you want to do is:

l = [x for x in l if x != 0]

which will return a copy of l without any of the elements that were zero (that operation is called a list comprehension, by the way). You could even shorten that last part to just if x, since non-zero numbers evaluate to True.

There is no such thing as a loop termination condition of i < len(l), in the way you’ve written the code, because len(l) is precalculated before the loop, not re-evaluated on each iteration. You could write it in such a way, however:

i = 0
while i < len(l):
   if l[i] == 0:
       l.pop(i)
   else:
       i += 1

More Related Contents:

  1. What does += mean in this context?
  2. What does “list comprehension” and similar mean? How does it work and how can I use it?
  3. Why does append() always return None in Python? [duplicate]
  4. Convert all strings in a list to int
  5. Get unique values from a list in python [duplicate]
  6. Element-wise addition of 2 lists?
  7. Iterate over all pairs of consecutive items in a list [duplicate]
  8. How Big can a Python List Get?
  9. Sum a list of numbers in Python
  10. Python: Removing list element while iterating over list [duplicate]
  11. Converting a String to a List of Words?
  12. In Python, when to use a Dictionary, List or Set?
  13. Check if something is (not) in a list in Python
  14. How to find the last occurrence of an item in a Python list
  15. How to force a list to a fixed size?
  16. What is the inverse function of zip in python? [duplicate]
  17. Pandas expand rows from list data available in column
  18. How to remove all duplicate items from a list [duplicate]
  19. Unpack list to variables
  20. django – convert a list back to a queryset [duplicate]
  21. Convert list of strings to dictionary
  22. Most efficient way for a lookup/search in a huge list (python)
  23. Sort list of strings by a part of the string
  24. Create random list of integers in Python
  25. Why does df.apply(tuple) work but not df.apply(list)?
  26. How to concatenate element-wise two lists in Python [duplicate]
  27. Creating a dictionary with list of lists in Python
  28. Python and SQLite: insert into table
  29. Creating a list in Python with multiple copies of a given object in a single line
  30. How can I turn a flat list into a 2D array in python?

Leave a Comment