Python Style and Naming Variables

[rsherry8]

Please consider the following Python code:

def my_sum(array):
    ret = 0
    for i in range(len(array)):
        ret += array[i]
    return ret

array = [ 1,2,3,4]
print( "sum is " + str(my_sum(array)) )

In this case, the code analyzer from Spyder generates a warning because the name of the parameter and the name of
the global variable are the same. I do not see anything wrong with this. Is there something I am missing?