More of a flop than a flip#
### We have learned in the previous step that the following code flips ```img``` left to right.
```
for y in range(len(img)):
for x in range(len(img[y])//2):
temp = img[y][x]
img[y][x] = img[y][len(img[y])-x-1]
img[y][len(img[y])-x-1] = temp
```
However, one student wrote a slightly different code.
```
for y in range(len(img)):
for x in range(len(img[y])):
temp = img[y][x]
img[y][x] = img[y][len(img[y])-x-1]
img[y][len(img[y])-x-1] = temp
```
What will be the outcome if we use this code?
1. [ ] ```img``` changes size
2. [ ] ```img``` is flipped horizontally
3. [ ] ```IndexError```
4. [ ] ```img``` doesn't change at all