def varpos(var1, *var3, var2='b'):
    print('var1:', var1)
    print('var2:', var2)
    print('var3:', var3)
    print('-----')
'''
varpos(1, 2)
varpos('a')
varpos(1, 2, 3, var2='c')
varpos(1, 2, 3, 4, 5, 6)
'''

'''
def average(total, count=None, *values):
    if count == None:
        if not isinstance(total, (list, tuple)):
            raise TypeError('If only one argument is given, it must be a list or tuple')
        return sum(total) / len(total)
    else:
        return total / count

'''

def average2(total, count=None, *values):
    print('total =', total)
    print('count =', count)
    print('values =', values)
    if count == None:
        if not isinstance(total, (list, tuple)):
            raise TypeError('If only one argument is given, it must be a list or tuple')
        return sum(total) / len(total)
    elif len(values) == 0:
        return total / count
    else:
        return sum((total, count)+tuple(values)) / (2+len(values))

print(average2((1,2,3,4)))
print(average2(count=10, 4))
print(average2(4, 10, 8))