TypeError: ‘numpy.float64’ object is not callable error typically occurs in Python when you use the **“m****ultiplication without using * sign”** or **“overwrite the sum() function with a numpy.float64 object“**.

**Reason 1: Multiplication without using * sign**

```
import numpy as np
# Define arrays
x = np.array([1, 2, 3, 4, 5])
y = np.array([12, 14, 14, 19, 22])
# Attempt to multiply two arrays together
mul = (x)(y)
# View result
print(mul)
```

**Output**

`TypeError: 'numpy.ndarray' object is not callable`

**How to fix it?**

```
import numpy as np
# Define arrays
x = np.array([11, 21, 19, 18, 46])
y = np.array([1, 2, 3, 4, 5])
# Attempt to multiply two arrays together
mul = (x)*(y)
# View result
print(mul)
```

**Output**

`[ 11 42 57 72 230]`

**Reason 2: Overwrite the sum() function with a numpy.float64 object**

In this approach, errors will occur when you overwrite the built-in **sum()** function with a **numpy.float64** object. Thus, when you later try to use the sum function to add up the numbers in the list, you get the error since **numpy.float64** is not callable.

```
import numpy as np
sum = np.float64(10.5)
result = sum([1, 2, 3])
print(result)
```

**Output**

`TypeError: 'numpy.float64' object is not callable`

**How to fix it?**

To fix this, you can simply rename the sum variable to something else:

```
import numpy as np
my_sum = np.float64(10.5) # Rename the variable
result = sum([1, 2, 3]) # Now this uses the built-in sum function
print(result)
```

**Output**

`6`

Always be cautious about overwriting built-in function names. It’s a good practice to avoid using names that are the same as built-in functions or methods.

**Related posts**

How to Fix ‘numpy.ndarray’ object is not callable

How to Fix ‘numpy.float64’ object cannot be interpreted as an integer

How to Fix numpy.linalg.linalgerror: singular matrix

Krunal Lathiya is a seasoned Computer Science expert with over eight years in the tech industry. He boasts deep knowledge in Data Science and Machine Learning. Versed in Python, JavaScript, PHP, R, and Golang. Skilled in frameworks like Angular and React and platforms such as Node.js. His expertise spans both front-end and back-end development. His proficiency in the Python language stands as a testament to his versatility and commitment to the craft.

object is not callable error typically occurs in Python when you use