octavian octavian - 3 months ago 49
Python Question

TypeError: unhashable type: 'slice' for panda

I have a panda datastructure, which I create like this:

test_inputs = pd.read_csv("../input/test.csv", delimiter=',')


Its shape

print(test_inputs.shape)


is this

(28000, 784)


I would like to print a subset of its rows, like this:

print(test_inputs[100:200, :])
print(test_inputs[100:200, :].shape)


However, I am getting:

TypeError: unhashable type: 'slice'


Any idea what could be wrong?

Answer Source

There is more possible solutions, but output is not same:

loc selects by labels, but iloc and slicing without function, the start bounds is included, while the upper bound is excluded, docs - select by positions:

test_inputs = pd.DataFrame(np.random.randint(10, size=(28, 7)))

print(test_inputs.loc[10:20])
    0  1  2  3  4  5  6
10  3  2  0  6  6  0  0
11  5  0  2  4  1  5  2
12  5  3  5  4  1  3  5
13  9  5  6  6  5  0  1
14  7  0  7  4  2  2  5
15  2  4  3  3  7  2  3
16  8  9  6  0  5  3  4
17  1  1  0  7  2  7  7
18  1  2  2  3  5  8  7
19  5  1  1  0  1  8  9
20  3  6  7  3  9  7  1

print(test_inputs.iloc[10:20])
    0  1  2  3  4  5  6
10  3  2  0  6  6  0  0
11  5  0  2  4  1  5  2
12  5  3  5  4  1  3  5
13  9  5  6  6  5  0  1
14  7  0  7  4  2  2  5
15  2  4  3  3  7  2  3
16  8  9  6  0  5  3  4
17  1  1  0  7  2  7  7
18  1  2  2  3  5  8  7
19  5  1  1  0  1  8  9

print(test_inputs[10:20])
    0  1  2  3  4  5  6
10  3  2  0  6  6  0  0
11  5  0  2  4  1  5  2
12  5  3  5  4  1  3  5
13  9  5  6  6  5  0  1
14  7  0  7  4  2  2  5
15  2  4  3  3  7  2  3
16  8  9  6  0  5  3  4
17  1  1  0  7  2  7  7
18  1  2  2  3  5  8  7
19  5  1  1  0  1  8  9