Reference library

Comprehensions & generators

List/dict/set comprehensions, generator expressions, and lazy iteration.

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Comprehensions & generators medium

Build a Generator Pipeline in Python: Filter Then Map

Create a lazy data pipeline by chaining generator functions that read, filter, map, and write data step by step.

generators pipeline lazy-evaluation
Python 
def read_data():
    return ["a", "bb", "ccc", "dd", "eeeee", "f"]


def filter_short(words):
    return (word for word in words if len(word) >= 2)


def map_to_upper(words):
    return (word.upper() for word in words)


def write_data(words):
    for word in words:
        print(word)


if __name__ == "__main__":
   …
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Comprehensions & generators — Python code examples

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This page collects comprehensions & generators snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

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