TypeError: list indices must be integers or slices, not list
71,121
Solution 1
This is a classic mistake. i
in your case is already an element from array
(i.e. another list), not an index of array
(not an int
), so
if Volume == i[2]:
counter += 1
You can check the Python tutorial. Also, try doing this:
for i in array:
print (i)
And see what you get!
Also I would advise to stick to naming conventions: variables are normally lower-case (volume
, not Volume
). In this case i
is misleading. row
or elem
would be much more suitable.
Solution 2
Also, as this may happen frequently, note that you cannot access slices of lists (but you can for an array):
import numpy as np
integerarray = np.array([33,11,22], dtype=int)
integerlist = [33,11,22]
indexArray = [1,2,0] # or equivalently, an array, e.g. np.argsort(integerlist)
print(integerarray[indexArray]) ## works fine
print(integerlist[indexArray]) ## triggers: TypeError: list indices must be integers or slices, not list
I hope this helps. It even happened to me that I had to convert to a float array, otherwise the object would remain of the wrong type.
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Author by
Michael
Updated on June 30, 2020Comments
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Michael almost 4 years
array = some kind of list with 3 columns and unlimited amount of rows with data inside of it.
Volume = array[0][2] counter = 0 for i in array: if Volume == array[i][2]: #<------ why is this line a problem? counter += 1
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Simas over 4 yearsfplandes, I have the same problem, for a moment my code was working, I have made some alterations in other functions, and now it throws the TypeError.
lamb_func = lambda x,f,v: [x['data']['q']['57']['dt'], x['data']['q']['57']['meta'][f][v]['s']]
i pass anx
(dictionary),f
(string) andv
(string) arguments. How can one solve it, without amending thelamb_func
to return results?