I would like to give some feedback about ...

From: https://py.checkio.org/mission/min-max/solve/

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i think my code is okay and in my visualstudio do well my code. but it is not working my code in this web. error is TypeError: 'generator' object is not subscriptable, min, 8, , 9 "min(abs(i) for i in range(-10, 10))" my code is

def min(*args, **kwargs):
    key = kwargs.get("key", None)
    if key==None:
        if len(args)==1:
            b=args[0]
        else:
            b=args
        mi=b[0]
        for i in range(len(b)):
            if mi>b[i]:
                mi=b[i]
            else:
                pass
    else:
        if len(args)==1:
            b=args[0]
        else:
            b=args
        mi=b[0]
        for i in range(len(b)):
            if key(mi)>key(b[i]):
                mi=b[i]
            else:
                pass
    return mi


def max(*args, **kwargs):
    key = kwargs.get("key", None)
    if key==None:
        if len(args)==1:
            b=args[0]
        else:
            b=args
        mi=b[0]
        for i in range(len(b)):
            if mi<b[i]:
                mi=b[i]
            else:
                pass
    else:
        if len(args)==1:
            b=args[0]
        else:
            b=args
        mi=b[0]
        for i in range(len(b)):
            if key(mi)<key(b[i]):
                mi=b[i]
            else:
                pass
    return mi


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"