Python 3 code to find sum

python sum

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+# Python 3 code to find sum  
+# of elements in given array  
+def _sum(arr):  
+
+    # initialize a variable 
+    # to store the sum 
+    # while iterating through 
+    # the array later 
+    sum=0
+
+    # iterate through the array 
+    # and add each element to the sum variable 
+    # one at a time 
+    for i in arr: 
+        sum = sum + i 
+
+    return(sum)  
+
+# driver function  
+arr=[]  
+# input values to list  
+arr = [12, 3, 4, 15]  
+
+# calculating length of array  
+n = len(arr)  
+
+ans = _sum(arr)  
+
+# display sum  
+print ('Sum of the array is ', ans)  
+