# Python: Find the number which when appended to the list makes the total 0

## Python Programming Puzzles: Exercise-61 with Solution

Write a Python program to find the number which when appended to the list makes the total 0.

Input: [1, 2, 3, 4, 5] Output: -15 Input: [-1, -2, -3, -4, 5] Output: 5 Input: [10, 42, 17, 9, 1315182, 184, 102, 29, 15, 39, 755] Output: -1316384

**Pictorial Presentation:**

**Sample Solution:**

**Python Code:**

```
#License: https://bit.ly/3oLErEI
def test(nums):
dset = set(nums)
result = sum(nums)
dmin = abs(min(nums) - sum(dset^set(nums)))
for d in dset^set(nums):
dcopy = list(nums)
dcopy.append(d)
ds = sum(dcopy)
if 0-ds < dmin:
result = ds
dmin = abs(ds)
elif 0-ds == dmin:
result = min(result, ds)
return result*(-1)
nums = [1, 2, 3, 4, 5]
print("Original list of numbers:")
print(nums)
print("Number which when appended to the list makes the total 0:")
print(test(nums))
nums = [-1, -2, -3, -4, 5]
print("\nOriginal list of numbers:")
print(nums)
print("Number which when appended to the list makes the total 0:")
print(test(nums))
nums = [10, 42, 17, 9, 1315182, 184, 102, 29, 15, 39, 755]
print("\nOriginal list of numbers:")
print(nums)
print("Number which when appended to the list makes the total 0:")
print(test(nums))
```

Sample Output:

Original list of numbers: [1, 2, 3, 4, 5] Number which when appended to the list makes the total 0: -15 Original list of numbers: [-1, -2, -3, -4, 5] Number which when appended to the list makes the total 0: 5 Original list of numbers: [10, 42, 17, 9, 1315182, 184, 102, 29, 15, 39, 755] Number which when appended to the list makes the total 0: -1316384

**Flowchart:**

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## Python: Tips of the Day

**Executes the provided function once for each list element, starting from the list's last element:**

Example:

def tips_for_each_right(itr, fn): for el in itr[::-1]: fn(el) tips_for_each_right([3, 6, 9], print)

Output:

9 6 3

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