# CodeStepByStep ## negative_sum

Language/Type: Python file input

Write a function named `negative_sum` that accepts a string as a parameter representing a file name, which reads input from that file containing a series of integers, and determine whether the sum starting from the first number is ever negative. The function should pra message indicating whether a negative sum is possible and should return `True` if a negative sum can be reached and `False` if not. For example, if the file contains the following text, your function will consider the sum of just one number (38), the sum of the first two numbers (38 + 4), the sum of the first three numbers (38 + 4 + 19), and so on up to the sum of all of the numbers:

```38 4 19 -27 -15 -3 4 19 38
```

None of these sums is negative, so the function would produce the following message and return `False`:

```no negative sum
```

If the file instead contains the following numbers, the function finds that a negative sum of -8 is reached after adding 6 numbers together (14 + 7 + -10 + 9 + -18 + -10):

```14 7 -10 9 -18 -10 17 42 98
```

It should output the following and return `True`, indicating that a negative sum can be reached:

```-8 after 6 steps
```
Function: Write a Python function as described, not a complete program.