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Comprehensions & generators

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

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Comprehensions & generators easy

How to Filter Data with Predicates in Python

This helper filters a list with a predicate using a list comprehension, plus a lazy generator version that yields matches one by one.

filtering comprehensions generators
Python 
def filter_data(data, predicate):
    """Return a list containing only items that pass the predicate."""
    return [item for item in data if predicate(item)]


def filter_data_lazy(data, predicate):
    """Generator version: yields items that pass the predicate one by one."""
    for item in data:
        if predicat…
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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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