Learn how to create, index, slice, reshape, and perform arithmetic operations on arrays using NumPy, the most popular Python library for data science.

How to use arrays in Python To create an array in Python, we can use a type of variable called a “dictionary.” This is an associative array, meaning that it is made of value/key pairs.

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This post shows readers how to create an array in Java. Including: Array Lists, multidimensional arrays, maps, ... Unlike a list in say Python, however, Java arrays are of a fixed size.