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Functions & basics

Reusable building blocks — parameters, returns, scope, and clear function design.

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Functions & basics easy

Python Filter Function with Default Parameters for Beginners

Create a reusable filter function with default parameters to keep or exclude numbers above or below a threshold.

functions default-parameters filter
Python 
def filter_numbers(numbers, threshold=0, reverse=False):
    """Return numbers that pass the threshold filter.

    Args:
        numbers: list of numbers to filter
        threshold: minimum value to keep (default 0)
        reverse: if True, keep numbers below threshold (default False)
    """
    if reverse:
      …
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