Final answer:
When 'list1' is [1, 5, 9], 'sum(list1)' would return 15 as it calculates the total sum of the elements in the list. This is a basic feature of Python used for summing numeric values in a list.
Step-by-step explanation:
If list1 is [1, 5, 9], then sum(list1) refers to the sum of all the items in the list. In Python, the sum() function calculates the total of all numeric values within an iterable, such as a list.
Example Calculation
We can calculate the sum manually:
1 (first list item)
+ 5 (second list item)
+ 9 (third list item)
= 15 (the sum of the items)
Therefore, sum(list1) would return 15 when executed in a Python environment. This result is achieved by adding up all the elements of the list. In Python coding, this function is very useful for quickly obtaining the total of a series of numbers and demonstrates a basic but powerful feature of the language for processing collections of numerical data.
To find the sum of a list of numbers, you need to add all the numbers together. In this case, the list is [1, 5, 9]. To find the sum, you add 1 + 5 + 9, which equals 15. So, the sum of list1 is 15.