Sum all numbers in a given range of a given list Python
<p>How can I write a function to get the sum of the items in the given list between the indices a and b. For example give <code>aList=[6,3,4,2,5]</code> and <code>a=1</code>, <code>b=3</code>, the function should return 9. Here is my code:</p>

<pre><code>def sumRange(L,a,b):
    sum= []
    L = [6,3,4,2,5]
    for i in range(a,b+1,1):
    sum +=L[i]
    return sum
</code></pre>