Python unsubscriptable
Question:
What does unsubscriptable mean in the context of a TypeError as in:
TypeError: 'int' object is unsubscriptable
EDIT:
Short code example that results in this phenomena.
a=[[1,2],[5,3],5,[5,6],[2,2]]
for b in a:
print b[0]
> 1
> 5
> TypeError: 'int' object is unsubscriptable
Answers:
It means you tried treating an integer as an array. For example:
a = 1337
b = [1,3,3,7]
print b[0] # prints 1
print a[0] # raises your exception
You are trying to lookup an array subscript of an int:
>>> 1[0]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is unsubscriptable
That is, square brackets [] are the subscript operator. If you try to apply the subscript operator to an object that does not support it (such as not implementing __getitem__()).
The problem in your sample code is that the array “a” contains two different types: it has 4 2-element lists and one integer. You are then trying to sub-script every element in “a”, including the integer element.
In other words, your code is effectively doing:
print [1,2][0]
print [5,3][0]
print 5[0]
print [5,6][0]
print [2,2][0]
That middle line where it does “5[0]” is what is generating the error.
I solved this converting my variable from list to array!
import numpy as np
my_list = API.get_list()
my_array = np.array(my_list)
Even working and be a false positive, this solved my ‘problem’
What does unsubscriptable mean in the context of a TypeError as in:
TypeError: 'int' object is unsubscriptable
EDIT:
Short code example that results in this phenomena.
a=[[1,2],[5,3],5,[5,6],[2,2]]
for b in a:
print b[0]
> 1
> 5
> TypeError: 'int' object is unsubscriptable
It means you tried treating an integer as an array. For example:
a = 1337
b = [1,3,3,7]
print b[0] # prints 1
print a[0] # raises your exception
You are trying to lookup an array subscript of an int:
>>> 1[0]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is unsubscriptable
That is, square brackets [] are the subscript operator. If you try to apply the subscript operator to an object that does not support it (such as not implementing __getitem__()).
The problem in your sample code is that the array “a” contains two different types: it has 4 2-element lists and one integer. You are then trying to sub-script every element in “a”, including the integer element.
In other words, your code is effectively doing:
print [1,2][0]
print [5,3][0]
print 5[0]
print [5,6][0]
print [2,2][0]
That middle line where it does “5[0]” is what is generating the error.
I solved this converting my variable from list to array!
import numpy as np
my_list = API.get_list()
my_array = np.array(my_list)
Even working and be a false positive, this solved my ‘problem’