maxmin.py

# CheckIO mission https://py.checkio.org/mission/min-max/
# Write python implementation of the built-in functions max
#
#   max(iterable, *[, key])
#   max(arg1, arg2, *args[, key])

def min(*args, **kwargs):
    
    key = kwargs.get("key", lambda x: x)
    
    the_list = list(args[0]) if len(args) == 1 else args
    
    result = the_list[0]
    for item in the_list:
        if key(item) < key(result):
            result = item        
    
    return result  


def max(*args, **kwargs):
    key = kwargs.get("key", lambda x: x)
    
    the_list = list(args[0]) if len(args) == 1 else args
    
    result = list(the_list)[0]
    for item in the_list:
        if key(item) > key(result):
            result = item    
    
    return result