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First solution in Clear category for Min and Max by gsbullmer
def min(*args, **kwargs):
"""
Returns the smallest item in an iterable or the smallest of two or more
arguments. If one positional argument is provided, it should be an
iterable. The smallest item in the iterable is returned. If two or more
positional arguments are provided, the smallest of the positional
arguments is returned. The optional keyword-only key argument specifies a
function of one argument that is used to extract a comparison key from
each list element (for example, key=str.lower). If multiple items are
minimal, the function returns the first one encountered.
"""
key = kwargs.get("key", None)
args = list(args[0] if len(args) is 1 else args)
smallest = args[0]
for a in args:
if key:
if key(a) < key(smallest):
smallest = a
elif a < smallest:
smallest = a
return smallest
def max(*args, **kwargs):
"""
Return the largest item in an iterable or the largest of two or more
arguments. If one positional argument is provided, it should be an
iterable. The largest item in the iterable is returned. If two or more
positional arguments are provided, the largest (smallest) of the
positional arguments is returned. The optional keyword-only key argument
specifies a function of one argument that is used to extract a comparison
key from each list element (for example, key=str.lower). If multiple items
are maximal, the function returns the first one encountered.
"""
key = kwargs.get("key", None)
args = list(args[0] if len(args) is 1 else args)
largest = args[0]
for a in args:
if key:
if key(a) > key(largest):
largest = a
elif a > largest:
largest = a
return largest
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"
assert min(abs(i) for i in range(-10, 10)) == 0, "generator"
July 24, 2017
