[newbie] confusion concerning fetching an element in a 2d-array

[Jean Dubois]

I'm confused by the behaviour of the following python-script I wrote:

#!/usr/bin/env python
#I first made a data file 'test.dat' with the following content
#1.0 2 3
#4 5 6.0
#7 8 9
import numpy as np
lines=[line.strip() for line in open('test.dat')]
#convert lines-list to numpy-array
array_lines=np.array(lines)
#fetch element at 2nd row, 2nd column:
print array_lines[1, 1]


When running the script I always get the following error:
IndexError: invalid index

Can anyone here explain me what I am doing wrong and how to fix it?

thanks in advance
jean