Strange outcome of addition.

Question

1,
I was trying to figure out, how split units of list and add them together according to our task 1 of 2.
Task 1/2 http://puu.sh/fngqF/6d7d08701f.png
I have tried this:
```python
def a(list):
    for unit in list:
        return unit + unit
b = [4, 2, 5]
print (a(b))
```
How come number 8 ?
o_O
2,
I was googling and there is function for that, but I know we are not supposed to use it yet:
```python
def a(list):
    for unit in list:
        return sum(list)
b = [4, 2, 5]
print (a(b))
```
3,
So I have to google even more to find out suitable solution. I found this:
```python
def a(list):
    start = 0
    for unit in list:
        start = start + unit
    return start
a([3, 5, 1])
```
But it does not show any output. Why ?
I had to modify it like this:
```python
def a(list):
    start = 0
    for unit in list:
        start = start + unit
    return print(start)
a([3, 5, 1])
```
4,
How are we supposed to solve it ? 
1 of 2 and 2 of 2.
I have no idea !

Kenneth Love · Answer

```python
def a(list):
    for unit in list:
        return unit + unit
b = [4, 2, 5]
print (a(b))
```
How come number 8 ?
Because you're returning after every step in the loop. And the first step is 4 + 4, which equals 8.
```python
def a(list):
    start = 0
    for unit in list:
        start = start + unit
    return start
a([3, 5, 1])
```
But it does not show any output. Why ?
Because return doesn't show output unless you're running in the Python shell. This is exactly what your solution should be for the code challenge. No printing in code challenges!

Iván Higuera-Mendieta · Answer

Hello to all, 
I am having problems with the second part of the Challenge, which involves the creation of summarize function. I am trying the following code, but the app keeps me saying "Oops! It looks like Task 1 is no longer passing". 
```python
def add_list(list):
  add = 0
  for item in list:
    add = add + item
  return add
def summarize(list):
  add = 0
  for item in list:
    add = add + item
  return add
  print("The sum of {} is {}".format(', '.join(list), add)
```
I also tried this, but the outcome was the same
```python
def add_list(list):
  add = 0
  for item in list:
    add = add + item
  return add
def summarize(list)
    print("The sum of {} is {}".format(', '.join(list), add_list(list))
```
What am I doing wrong, this task is horrible :'(

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silashunter

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Strange outcome of addition.

1,

2,

3,

4,

2 Answers

Kenneth Love

Kenneth Love

silashunter

silashunter

Kenneth Love

Kenneth Love

silashunter

silashunter

Kenneth Love

Kenneth Love

silashunter

silashunter

Iván Higuera-Mendieta

Iván Higuera-Mendieta

Kenneth Love

Kenneth Love