python - 'int' object is not subscriptable

Question

I am attempting a bit of knn classification. when i try to normalize the data in an array i keep getting the above error.

    norm_val = 100.00                                                              
    for i in range(0, len(ListData)):                                               
            ListData[i][0] = int(ListData[i][0]/max_val)

I'm getting the error on the last line which says, 'int' object is not subscriptable.

Thanks

This code is not enough to diagnose the problem. Most likely problem is that ListData is an integer and not an array or that ListData[i] is an integer and not an array. — Jules
– Jules, Commented Apr 24, 2012 at 15:04
Is your ListData a list of lists or just a simple list? If it is a simple list, ListData[i][0] is incorrect. — Praveen Gollakota
– Praveen Gollakota, Commented Apr 24, 2012 at 15:04
What does ListData look like? Your code is assuming ListData contains sequences of integers, but your error message suggests it may contain just integers. — Steven Rumbalski
– Steven Rumbalski, Commented Apr 24, 2012 at 15:06
@Jules: It can't be an integer, or this code would fail on the line before when len(ListData) is called. So this code is perfectly enough to diagnose the problem. All the data is there. — Tim Pietzcker
– Tim Pietzcker, Commented Apr 24, 2012 at 15:06
'ListData' contains values taken in from a text file that are ints and strings. i have the data being split every time a comma is come across. the data is just appended onto the end of the list then. — Hiky
– Hiky, Commented Apr 24, 2012 at 15:14

Tim Pietzcker · Accepted Answer · 2012-04-24 15:09:49Z

6

ListData appears to be a list of integers (or at least a list that also contains integers).

Therefore, ListData[i] returns the ith integer of the list. And since there is no such thing as "the first element of an integer", so you get this error when trying to access ListData[i][0].

Aside from that, if you're aiming to divide all items of a list by max_val, you can simply use a list comprehension:

ListData = [int(item/max_val) for item in ListData]

edited Apr 24, 2012 at 15:09

answered Apr 24, 2012 at 15:04

Tim Pietzcker

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2 Comments

Daenyth Over a year ago

You could write int(item/max_val) as item // max_val

Tim Pietzcker Over a year ago

@Daenyth: It's not quite the same: 2//3.0 returns 0.0, so if max_val is a float, you'd get a list of floats, not of ints.

Andreas Florath · Accepted Answer · 2012-04-24 15:08:32Z

2

ListData contains not only lists but also other objects which are not lists.

The following works:

ListData = [ [99, "Some thing"],
             [88, "Some other thing"] ]

The following does not:

ListData = [ 99,
             88 ]

It is not really clear what you want to do.

answered Apr 24, 2012 at 15:08

Andreas Florath

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