In [1]:

    

import numpy as np


    

In [2]:

    

a = np.arange(3)


    

In [3]:

    

print(a)


    

    




[0 1 2]

In [4]:

    

print(a.flags)


    

    




  C_CONTIGUOUS : True
  F_CONTIGUOUS : True
  OWNDATA : True
  WRITEABLE : True
  ALIGNED : True
  WRITEBACKIFCOPY : False
  UPDATEIFCOPY : False

In [5]:

    

print(type(a.flags))


    

    




<class 'numpy.flagsobj'>

In [6]:

    

print(a.flags.writeable)


    

    




True

In [7]:

    

print(a.flags['WRITEABLE'])


    

    




True

In [8]:

    

a[0] = 100


    

In [9]:

    

print(a)


    

    




[100   1   2]

In [10]:

    

a.flags.writeable = False


    

In [11]:

    

# a[0] = 0
# ValueError: assignment destination is read-only


    

In [12]:

    

a.flags['WRITEABLE'] = False
a.setflags(write=False)


    

In [13]:

    

a = np.arange(3)


    

In [14]:

    

print(a)


    

    




[0 1 2]

In [15]:

    

a.flags.writeable = False


    

In [16]:

    

a_view = a[1:]


    

In [17]:

    

print(a_view)


    

    




[1 2]

In [18]:

    

print(a_view.flags.writeable)


    

    




False

In [19]:

    

# a_view[0] = 100
# ValueError: assignment destination is read-only


    

In [20]:

    

# a_view.flags.writeable = True
# ValueError: cannot set WRITEABLE flag to True of this array


    

In [21]:

    

a.flags.writeable = True


    

In [22]:

    

print(a_view.flags.writeable)


    

    




False

In [23]:

    

a_view.flags.writeable = True


    

In [24]:

    

a_view[0] = 100


    

In [25]:

    

print(a_view)


    

    




[100   2]

In [26]:

    

print(a)


    

    




[  0 100   2]

In [27]:

    

a_view.flags.writeable = False


    

In [28]:

    

# a_view[1] = 1
# ValueError: assignment destination is read-only


    

In [29]:

    

print(a.flags.writeable)


    

    




True

In [30]:

    

a[1] = 1


    

In [31]:

    

print(a)


    

    




[0 1 2]

In [32]:

    

print(a_view)


    

    




[1 2]

In [33]:

    

a.flags.writeable = False


    

In [34]:

    

a_copy = a[1:].copy()


    

In [35]:

    

print(a_copy)


    

    




[1 2]

In [36]:

    

print(a_copy.flags.writeable)


    

    




True

In [37]:

    

a_copy[0] = 100


    

In [38]:

    

print(a_copy)


    

    




[100   2]

In [39]:

    

print(a)


    

    




[0 1 2]