Why does this iterative list-growing code give IndexError: list assignment index out of range?

j is an empty list, but you’re attempting to write to element [0] in the first iteration, which doesn’t exist yet.

Try the following instead, to add a new element to the end of the list:

for l in i:
    j.append(l)

Of course, you’d never do this in practice if all you wanted to do was to copy an existing list. You’d just do:

j = list(i)

Alternatively, if you wanted to use the Python list like an array in other languages, then you could pre-create a list with its elements set to a null value (None in the example below), and later, overwrite the values in specific positions:

i = [1, 2, 3, 5, 8, 13]
j = [None] * len(i)
#j == [None, None, None, None, None, None]
k = 0

for l in i:
   j[k] = l
   k += 1

The thing to realise is that a list object will not allow you to assign a value to an index that doesn’t exist.

Related Posts:

  1. How can I reverse a list in Python?
  2. Manually raising (throwing) an exception in Python
  3. How can I reverse a list in Python?
  4. What is the difference between Python’s list methods append and extend?
  5. Python – TypeError: ‘int’ object is not iterable
  6. Understanding slice notation
  7. TypeError: list indices must be integers or slices, not str
  8. IndexError: list index out of range and python
  9. How to convert list to string [duplicate]
  10. Finding the index of an item in a list
  11. Finding the index of an item in a list
  12. Accessing the index in ‘for’ loops?
  13. What does the list() function do in Python?
  14. List changes unexpectedly after assignment. Why is this and how can I prevent it?
  15. TypeError: ‘float’ object is not subscriptable
  16. Is there a short contains function for lists?
  17. appending list but error ‘NoneType’ object has no attribute ‘append’
  18. Check if something is (not) in a list in Python
  19. Python: finding an element in a list [duplicate]
  20. How to avoid “RuntimeError: dictionary changed size during iteration” error?
  21. Writing a list to a file with Python
  22. How do I concatenate two lists in Python?
  23. if else in a list comprehension
  24. How can I randomly select an item from a list?
  25. python exception message capturing
  26. Fastest way to check if a value exists in a list
  27. How can I count the occurrences of a list item?
  28. TypeError: ‘list’ object cannot be interpreted as an integer
  29. Finding median of list in Python
  30. Get list from pandas dataframe column or row?
  31. Finding and replacing elements in a list
  32. ValueError: max() arg is an empty sequence
  33. Remove list from list in Python
  34. python – if not in list
  35. How can I compare two lists in python and return matches
  36. Append integer to beginning of list in Python
  37. List comprehension on a nested list?
  38. Union of two lists in Python
  39. Python: Array v. List
  40. Get unique values from a list in python
  41. ‘list’ object has no attribute ‘shape’
  42. Writing a list to a file with Python
  43. How do I check if a list is empty?
  44. Understanding slice notation
  45. Add list to set?
  46. What’s the idiomatic syntax for prepending to a short python list?
  47. Converting Dictionary to List?
  48. Python Sets vs Lists
  49. AttributeError: ‘list’ object has no attribute ‘replace’ when trying to remove character
  50. How to deep copy a list?
  51. Python return list from function
  52. How to check if a string is a substring of items in a list of strings?
  53. Whats the difference between ‘for x in list:’ and ‘for x in list[:]:’
  54. ‘list’ object has no attribute ‘shape’
  55. How do I find the duplicates in a list and create another list with them?
  56. Catch multiple exceptions in one line (except block)
  57. How do I check if a list is empty?
  58. How can I get list of values from dict?
  59. IndexError: list index out of range and python
  60. AttributeError: ‘list’ object has no attribute ‘replace’ when trying to remove character
  61. How to sort a list of objects based on an attribute of the objects?
  62. Pop index out of range
  63. Print list without brackets in a single row
  64. How to iterate through two lists in parallel?
  65. How to properly ignore exceptions
  66. How to remove \n from a list element?
  67. django MultiValueDictKeyError error, how do I deal with it
  68. How to read a text file into a list or an array with Python
  69. Map to List error: Series object not callable
  70. how to create a list of lists
  71. Python assigning multiple variables to same value? list behavior
  72. How do I check if there are duplicates in a flat list?
  73. How to return dictionary keys as a list in Python?
  74. Append a tuple to a list – what’s the difference between two ways?
  75. Defining lists as global variables in Python
  76. Subtracting two lists in Python
  77. How can I remove all instances of an element from a list in Python?
  78. Create an empty list in Python with certain size
  79. How to concatenate items in a list to a single string?
  80. What’s the difference between lists enclosed by square brackets and parentheses in Python?
  81. Python 2: AttributeError: ‘list’ object has no attribute ‘strip’
  82. How to make a set of lists
  83. Appending to a list gives ‘int’ object has no attribute ‘append’
  84. Python data structure sort list alphabetically
  85. TypeError: unsupported format string passed to list.__format__
  86. numpy-equivalent of list.pop?
  87. How to create a numpy array of lists?
  88. convert csv file to list of dictionaries
  89. Element-wise addition of 2 lists?
  90. How to split elements of a list?
  91. Find object in list that has attribute equal to some value (that meets any condition)
  92. Handling a timeout error in python sockets
  93. Iterating through list of list in Python
  94. Python cant convert ‘list’ object to str error [closed]
  95. In Python, is there an elegant way to print a list in a custom format without explicit looping?
  96. Get difference between two lists
  97. Determine if 2 lists have the same elements, regardless of order? [duplicate]
  98. Building a list inside a list in python
  99. Writing Python lists to columns in csv
  100. Strange Exception in Tkinter callback

Leave a Comment