'numpy.float64' object does not support item assignment

Are you facing the error “typeerror: ‘numpy.float64’ object does not support item assignment“? Yes, you have come to the right place. In this tutorial, I will show you how to solve this error.

The error “‘numpy.float64’ object does not support item assignment” occurs when we try to assign a value to a NumPy float using square brackets.

[Fixed]: ‘numpy.float64’ object does not support item assignment

To solve the error, correct the assignment or the accessor, as we can’t mutate a floating-point number.

Here is an example of how this error occurs:

import numpy as np
float_value = np.float64(1.1)
# TypeError: 'numpy.float64' object does not support item assignment
float_value[0] = 18.0

In the above Python code, we are trying to access the NumPy float at index ‘0’ and trying to change the value that caused this error.

If you want to change the value, then you should declare another float variable instead of modifying this NumyPy float.

import numpy as np
float_value = np.float64(1.1)
new_float_value = np.float64(18.0)
print(new_float_value)

Floats, integers, strings, etc. are immutable, but we can change the item (float value) in the array or list.

my_list = np.array([1.1, 2.2, 3.3], dtype=np.float64)
my_list[0] = 4.4
print(my_list)

The Python “TypeError: ‘float’ object does not support item assignment” is caused when we try to mutate the float value.

If you aren’t sure what type variable stores, use the built-in type() class or isinstance() function.

import numpy as np
value_float = np.float64(1.1)
print(type(value_float))  
# <class 'numpy.float64'>
print(isinstance(value_float, np.float64))  # True

In the above code, we have a ‘numpy.float64‘ variable. And we used “type()” and “instance()” to check the type. ‘type()‘ will return the class type, and ‘isinstance()‘ will return True or False.

Conclusion on ‘numpy.float64’ object does not support item assignment

Programmers, we discussed how we can solve this error “‘numpy.float64’ object does not support item assignment“. If you are still getting the error please let us know in the comments section.

The error “‘numpy.float64’ object does not support item assignment” occurs when we try to assign a value to a NumPy float using square brackets.