如何使 NumPy 数组只读？

让我们讨论如何使 NumPy 数组不可变，即无法重写或无法更改。这可以通过将 NumPy 数组的可写标志设置为 false 来完成。

句法：

array.flags.writable=False

这将可写标志设置为假，因此数组变得不可变，即只读。请参阅下面的示例

例子：

Python

import numpy as np
 
 
a = np.zeros(11)
print("Before any change ")
print(a)
 
a[1] = 2
print("Before after first change ")
print(a)
 
a.flags.writable = False
print("After making array immutable on attempting  second change ")
a[1] = 7

输出：

Before any change
[0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]
Before after first change
[0. 2. 0. 0. 0. 0. 0. 0. 0. 0. 0.]
After making array immutable on attempting  second change
Traceback (most recent call last):
  File "gfg9.py", line 11, in 
    a[1]=7
ValueError: assignment destination is read-only