# indexing – Python, tuple indices must be integers, not tuple?

## indexing – Python, tuple indices must be integers, not tuple?

Your `output`

variable is not a `N x 4`

matrix, at least not in **python types** sense. It is a **tuple**, which can only be indexed by a single number, and you try to index by tuple (2 numbers with coma in between), which works only for numpy matrices. Print your output, figure out if the problem is just a type (then just convert to np.array) or if you are passing something completely different (then fix whatever is producing `output`

).

Example of what is happening:

```
import numpy as np
output = ((1,2,3,5), (1,2,1,1))
print output[1, 2] # your error
print output[(1, 2)] # your error as well - these are equivalent calls
print output[1][2] # ok
print np.array(output)[1, 2] # ok
print np.array(output)[(1, 2)] # ok
print np.array(output)[1][2] # ok
```