Generators in python explained with example python tutorial

Published: 29 August 2024
on channel: CodeLink

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certainly! in python, generators are a special type of iterable that allow you to create an iterator in a more memory-efficient way using the `yield` statement. they are particularly useful when you want to iterate over a large dataset without loading the entire dataset into memory.

what is a generator?

a generator is a function that uses `yield` instead of `return` to produce values on-the-fly. when a generator function is called, it returns a generator object without starting execution immediately. each time `next()` is called on the generator object, the function runs until it hits a `yield` statement, which returns a value and pauses the function’s state, allowing it to resume from the same point on the next call.

why use generators?

1. **memory efficiency**: generators are more memory efficient than lists because they yield items one at a time and do not store the entire sequence in memory.
2. **lazy evaluation**: generators compute their values on the fly, which can lead to performance improvements, especially for large datasets.
3. **simplified code**: generators can simplify the code required to create iterators.

creating a generator

you can create a generator in python using a function that contains at least one `yield` statement. here’s a simple example:

using the generator

you can use the generator function like this:

output

example: a fibonacci generator

let’s create a more complex example—a generator that produces fibonacci numbers.

using the fibonacci generator

you can use this generator to get fibonacci numbers:

output

handling generator state

one of the key features of generators is that they maintain their state between successive calls. this means you can pause and resume execution without losing the current state.

generator expressions

you can also create generators using generator expressions. they are similar to list comprehensions but use parentheses instead of brackets.

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