The **numpy.sum()** function calculates the total of all the values in a numpy array or list. By default, it calculates the sum of the entire array, but you can also specify an axis along which to compute the sum. This is useful if you want to calculate the sum of each column or row in a multi-dimensional array. The function returns a single value or an array of values, depending on the shape of the input array and the axis specified.

**Example**

**Example**