NumPy TutorialLesson 6Free preview

NumPy Array Slicing

This lesson is part of NumPy · All levels

Summary

Slicing allows you to take array snippets with syntax, similar to Python slicing lists but per dimension. In a 2D array, you can cut rows and columns at the same time like a[0:2, 1:4]. The negative step value reverses the order of the elements, so it's useful for quickly reversing the array.

Key points

Slicing uses the [start:stop:step] syntax and is stop-exclusive.
For 2D arrays, slicing is applied to each dimension separated by a comma.
The negative step reverses the direction of the element's alignment.
The result of slicing is generally a view, not a full copy.

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