Learning Numpy - Simple Tutorial For Beginners - NumPy Copies & Views - Part 19¶

import numpy as np
a = np.arange(6)

print ('Our array is:')
print (a)
print ('\n')

print ('Applying id() function:')
print (id(a))
print ('\n')

print ('a is assigned to b:')
b = a
print (b)
print ('\n')

print ('b has same id():')
print (id(b))
print ('\n')

print ('Change shape of b:')
b.shape = 3,2
print (b)
print ('\n')

print ('Shape of a also gets changed:')
print (a)
print ('\n')

import numpy as np
# To begin with, a is 3X2 array 
a = np.arange(6).reshape(3,2)

print ('Array a:')
print (a)
print ('\n')

print ('Create view of a:')
b = a.view()
print (b)
print ('\n')

print ('id() for both the arrays are different:')
print ('id() of a:')
print (id(a))
print ('\n')
print ('id() of b:')
print (id(b))
print ('\n')

# Change the shape of b. It does not change the shape of a 
b.shape = 2,3

print ('Shape of b:')
print (b)
print ('\n')

print ('Shape of a:')
print (a)
print ('\n')

import numpy as np
a = np.array([[10,10], [2,3], [4,5]])

print ('Our array is:')
print (a)
print ('\n')

print ('Create a slice:')
s = a[:, :2]
print (s)
print ('\n')

import numpy as np
a = np.array([[10,10], [2,3], [4,5]])

print ('Array a is:')
print (a)
print ('\n')

print ('Create a deep copy of a:')
b = a.copy()
print ('Array b is:' )
print (b)
print ('\n')

#b does not share any memory of a 
print ('Can we write b is a')
print (b is a)
print ('\n')

print ('Change the contents of b:')
b[0,0] = 100
print ('\n')

print ('Modified array b:')
print (b)
print ('\n')

print ('a remains unchanged:')
print (a)
print ('\n')