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Polished with some type annotations solution in Clear category for Min and Max by Mysta
from collections.abc import Callable
from typing import Any, Iterable
def min(*args: Any, **kwargs: Any) -> Any:
key: Callable | None = kwargs.get("key", None)
# From https://docs.python.org/3.3/library/functions.html#min
# If one positional argument is provided, iterable must be a non-empty
# iterable (such as a non-empty string, tuple or list). The smallest item
# in the iterable is returned. If two or more positional arguments are
# provided, the smallest of the positional arguments is returned.
items: Iterable = args[0] if len(args) == 1 else args
result: Any = None
for item in items:
if (
(result is None)
or (not key and item < result)
or (key and key(item) < key(result))
):
result = item
return result
def max(*args: Any, **kwargs: Any) -> Any:
key: Callable | None = kwargs.get("key", None)
# From https://docs.python.org/3.3/library/functions.html#max
# If one positional argument is provided, iterable must be a non-empty
# iterable (such as a non-empty string, tuple or list). The largest item
# in the iterable is returned. If two or more positional arguments are
# provided, the largest of the positional arguments is returned.
items: Iterable = args[0] if len(args) == 1 else args
result: Any = None
for item in items:
if (
(result is None)
or (not key and item > result)
or (key and key(item) > key(result))
):
result = item
return result
if __name__ == "__main__":
# These "asserts" using only for self-checking and not necessary for auto-testing
assert max(3, 2) == 3, "Simple case max"
assert min(3, 2) == 2, "Simple case min"
assert max([1, 2, 0, 3, 4]) == 4, "From a list"
assert min("hello") == "e", "From string"
assert max(2.2, 5.6, 5.9, key=int) == 5.6, "Two maximal items"
assert min([[1, 2], [3, 4], [9, 0]], key=lambda x: x[1]) == [9, 0], "lambda key"
print("Coding complete? Click 'Check' to review your tests and earn cool rewards!")
Jan. 3, 2026
