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Functions & basics

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

4 matches

Create a retry decorator with max attempts in Python

A decorator that retries a function up to a specified number of times when it raises an exception, with an optional delay between attempts.

decorator retry error-handling

Python

import functools
import time


def retry(max_attempts, delay=0.1):
    """Retry a function up to max_attempts times on exception."""
    def decorator(func):
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            for attempt in range(1, max_attempts + 1):
                try:
                …

12 0 Open

Functions & basics easy

How to Use Default Parameters with Python's Split Function

Create a reusable Python wrapper around str.split with sensible default parameters for delimiter and maxsplit, showing beginners how default arguments work.

strings default-parameters functions

Python

def split_with_defaults(text, delimiter=" ", maxsplit=-1):
    """
    Split a string into parts using a delimiter.
    Default behavior: split on spaces, unlimited splits.
    """
    parts = text.split(delimiter, maxsplit)
    return parts


if __name__ == "__main__":
    # Example usage with defaults and custom par…

14 0 Open

Functions & basics easy

How to Use functools.reduce in Python

Apply functools.reduce with operator functions and lambda expressions to aggregate lists into sums, products, maximums, and concatenated strings.

reduce functools lambda

Python

from functools import reduce
import operator

# Sum all numbers in a list using reduce
numbers = [1, 2, 3, 4, 5]
sum_result = reduce(operator.add, numbers)

# Find the maximum value using reduce
max_result = reduce(lambda a, b: a if a > b else b, numbers)

# Multiply all numbers using reduce
product_result = reduce(la…

12 0 Open

Functions & basics easy

How to Validate CLI Integer Option Within a Range in Python

Use argparse with integer type and bounds checking to validate a command-line option falls within a specified min-max range.

argparse cli validation

Python

import argparse

def main():
    parser = argparse.ArgumentParser(description="Validate an integer within a range.")
    parser.add_argument("--value", type=int, required=True, help="Integer to validate")
    parser.add_argument("--min", type=int, default=0, help="Minimum allowed value")
    parser.add_argument("--max…

14 0 Open

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