1 | initial version |

What about this?

```
def f(x):
return sum([x[i] for i in range(len(x))])
```

(I just think it's easier to remember than the answer by DSM.)

2 | No.2 Revision |

What about this? Assume $x$ is a list. Then:

```
def f(x):
return
```~~sum([x[i] for i in range(len(x))])
~~sum(x)

(I just think it's easier to remember than the answer by DSM.)

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