Iterators

Iterators are objects that allow a programmer to traverse through all the elements of a collection, regardless of its specific implementation. In data science, iterators are commonly used to iterate through large datasets, allowing the programmer to access each element of the dataset one at a time, rather than loading the entire dataset into memory at once. This can be particularly useful when working with datasets that are too large to fit into memory, or when working with streaming data that is being generated in real-time. Iterators can also be used to implement lazy evaluation, which allows a program to defer the evaluation of an expression until it is actually needed. This can be useful for optimizing performance and reducing memory usage.
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