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running_totals

Your mission

Implement running_totals, which returns, for each position of a list of integers, the sum of everything up to that position.

See it in action

running_totals([3, 1, 4, 1]): [3, 4, 8, 9]
running_totals([5, -7, 2]): [5, -2, 0]
running_totals([]): []

Your checklist

values can be empty. Its elements can be any int, negative and very large ones included.
Return a list with exactly as many elements as values.
The element at index i of the result is the sum of values[0] through values[i], both included.
Do not modify values.

Constraints

Expected file: running_totals.py
Allowed functions: None. Write every helper yourself.

Run the tests to grade your code

16 tests

One element gives itself
Empty list gives an empty list
Positive values
Two elements
Zeros keep the total at zero
Only negative values
Signs alternate, totals go up and down
First element negative
Zeros inside the list
Values far beyond 64 bits
Large values summed exactly
Twelve ones count up
Thirty mixed values
A second call starts from scratch
values is left unchanged
values is left unchanged (negative start)

Python

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Exercises
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running_totals

Your mission

Implement running_totals, which returns, for each position of a list of integers, the sum of everything up to that position.

See it in action

running_totals([3, 1, 4, 1]): [3, 4, 8, 9]
running_totals([5, -7, 2]): [5, -2, 0]
running_totals([]): []

Your checklist

values can be empty. Its elements can be any int, negative and very large ones included.
Return a list with exactly as many elements as values.
The element at index i of the result is the sum of values[0] through values[i], both included.
Do not modify values.

Constraints

Expected file: running_totals.py
Allowed functions: None. Write every helper yourself.

Run the tests to grade your code

16 tests

One element gives itself
Empty list gives an empty list
Positive values
Two elements
Zeros keep the total at zero
Only negative values
Signs alternate, totals go up and down
First element negative
Zeros inside the list
Values far beyond 64 bits
Large values summed exactly
Twelve ones count up
Thirty mixed values
A second call starts from scratch
values is left unchanged
values is left unchanged (negative start)

Variables will appear here

Python