Python functions will always return one value
Python generators can return one OR more values!
A generator works by "saving" where it last left off (or yielding) and giving the calling function a value.
A generator function requires Python's yield statement
Python generators can return one OR more values!
A generator works by "saving" where it last left off (or yielding) and giving the calling function a value.
A generator function requires Python's yield statement
To create a generator in #Python, you must use the `yield` keyword.
Here's an example that can generate an infinite number of return values:
Here's an example that can generate an infinite number of return values:
You can also make a generator that only generates a finite number of items.
For this example, you use the `yield` keyword 3 times:
For this example, you use the `yield` keyword 3 times:
You can also loop over a generator object. This allows you to work on the items that the generator yields to you one at a time without the need to call `next()`
Python has generators built into the language. For example, if you open a file, you can iterate over that file object line-by-line.
Under the covers, Python is yielding those lines one at a time. In other words, it's using a generator!
Under the covers, Python is yielding those lines one at a time. In other words, it's using a generator!
You can read more about generators in my tutorial @mousevspython
blog.pythonlibrary.org/2016/05/03/pytโฆ
blog.pythonlibrary.org/2016/05/03/pytโฆ
I hope you enjoyed this thread on Python generators.
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