# Python: Compute the sum of the three lowest positive numbers from a given list of numbers

## Python Basic - 1: Exercise-89 with Solution

Write a Python program to compute the sum of the three lowest positive numbers from a given list of numbers.

**Sample Solution**:

**Python Code:**

```
# Define a function named sum_three_smallest_nums that takes a list of numbers (lst) as an argument.
def sum_three_smallest_nums(lst):
# Sum the three smallest positive numbers in the sorted list of positive numbers from the input list.
return sum(sorted([x for x in lst if x > 0])[:3])
# Create a list of numbers for testing.
nums = [10, 20, 30, 40, 50, 60, 7]
# Print the original list of numbers.
print("Original list of numbers: ", nums)
# Print the sum of the three lowest positive numbers in the list.
print("Sum of the three lowest positive numbers of the said array: ", sum_three_smallest_nums(nums))
# Test with a different list of numbers.
nums = [1, 2, 3, 4, 5]
# Print the original list of numbers.
print("\nOriginal list of numbers: ", nums)
# Print the sum of the three lowest positive numbers in the list.
print("Sum of the three lowest positive numbers of the said array: ", sum_three_smallest_nums(nums))
# Test with another list of numbers that includes zero.
nums = [0, 1, 2, 3, 4, 5]
# Print the original list of numbers.
print("\nOriginal list of numbers: ", nums)
# Print the sum of the three lowest positive numbers in the list.
print("Sum of the three lowest positive numbers of the said array: ", sum_three_smallest_nums(nums))
```

Sample Output:

Original list of numbers: [10, 20, 30, 40, 50, 60, 7] Sum of the three lowest positive numbers of the said array: 37 Original list of numbers: [1, 2, 3, 4, 5] Sum of the three lowest positive numbers of the said array: 6 Original list of numbers: [0, 1, 2, 3, 4, 5] Sum of the three lowest positive numbers of the said array: 6

**Explanation: **

Here is a breakdown of the above Python code:

- Function Definition:
- The code defines a function named "sum_three_smallest_nums()" that takes a list of numbers (lst) as an argument.
- List Comprehension:
- The function uses list comprehension to filter positive numbers from the input list.
- Sorting and Summing:
- The positive numbers are sorted, and the sum of the three smallest positive numbers is calculated using slicing ([:3])

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