21. Basic array operations (sum) in Numpy

In this NumPy tutorial video, I have explained only the sum function. This video also explain you axis in NumPy. if you can understand the sum function then also you can understand other functions very easily.
This video also demonstrating the use of axis function in NumPy arrays.

axis: axis along which we want to calculate the sum value. Otherwise, it will consider arr to be flattened(works on all the axis). axis = 0 means along the column and axis = 1 means working along the row.

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