When I create a one dimensional array in numpy and use a string (containing digits) to index it, I get an error as expected:

>>> import numpy as np
>>> a = np.arange(15)
>>> a['10']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: field named 10 not found.

However, when I create a two dimensional array and use two strings for indexing, it gives no error and returns the element as if the strings are converted to integers first

>>> b = np.arange(15).reshape(3,5)
>>> b
array([[ 0,  1,  2,  3,  4],
       [ 5,  6,  7,  8,  9],
       [10, 11, 12, 13, 14]])
>>> b[1, 2]
7
>>> b['1', '2']
7

What's going on? Why don't I get an error in the two dimensional case?

python numpy indexing
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