In [1]:

    

import numpy as np


    

In [2]:

    

a_1d = np.arange(10)
print(a_1d)


    

    




[0 1 2 3 4 5 6 7 8 9]

In [3]:

    

print(a_1d[2:7])


    

    




[2 3 4 5 6]

In [4]:

    

print(a_1d[:7])


    

    




[0 1 2 3 4 5 6]

In [5]:

    

print(a_1d[2:])


    

    




[2 3 4 5 6 7 8 9]

In [6]:

    

print(a_1d[2:7:2])


    

    




[2 4 6]

In [7]:

    

a_2d = np.arange(12).reshape(3, 4)
print(a_2d)


    

    




[[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]

In [8]:

    

print(a_2d[:2, 1:3])


    

    




[[1 2]
 [5 6]]

In [9]:

    

print(a_2d[:2, :])


    

    




[[0 1 2 3]
 [4 5 6 7]]

In [10]:

    

print(a_2d[:2])


    

    




[[0 1 2 3]
 [4 5 6 7]]

In [11]:

    

print(a_2d[1:2])


    

    




[[4 5 6 7]]

In [12]:

    

print(a_2d[1:2].shape)


    

    




(1, 4)

In [13]:

    

print(a_2d[1])


    

    




[4 5 6 7]

In [14]:

    

print(a_2d[1].shape)


    

    




(4,)

In [15]:

    

print(a_2d[:, 2:3])


    

    




[[ 2]
 [ 6]
 [10]]

In [16]:

    

print(a_2d[:, 2:3].shape)


    

    




(3, 1)

In [17]:

    

print(a_2d[:, 2])


    

    




[ 2  6 10]

In [18]:

    

print(a_2d[:, 2].shape)


    

    




(3,)

In [19]:

    

print(a_2d[1:2, 2:3])


    

    




[[6]]

In [20]:

    

print(a_2d[1:2, 2:3].shape)


    

    




(1, 1)

In [21]:

    

print(a_2d[1, 2])


    

    




6

In [22]:

    

print(type(a_2d[1, 2]))


    

    




<class 'numpy.int64'>

In [23]:

    

a_3d = np.arange(24).reshape(2, 3, 4)
print(a_3d)


    

    




[[[ 0  1  2  3]
  [ 4  5  6  7]
  [ 8  9 10 11]]

 [[12 13 14 15]
  [16 17 18 19]
  [20 21 22 23]]]

In [24]:

    

print(a_3d[0, 0, 0])


    

    




0

In [25]:

    

print(a_3d[0, 0])


    

    




[0 1 2 3]

In [26]:

    

print(a_3d[0])


    

    




[[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]

In [27]:

    

print(a_3d[0:1, 0:1, 0:1])


    

    




[[[0]]]

In [28]:

    

print(a_3d[0:1, 0:1])


    

    




[[[0 1 2 3]]]

In [29]:

    

print(a_3d[0:1])


    

    




[[[ 0  1  2  3]
  [ 4  5  6  7]
  [ 8  9 10 11]]]