i'm trying to iterate over an arraylist saving in every loop the highest/lowest difference of the consecutive values.

```
e1=([ 0 , 0, 0, 0, 15, 28, 28, 28, 27, 27, 35, 44, 43, 43, 42, 39])
Hodiffmax = 0
Hodiffmin = 0
for k in e1:
diff1= e1[k+1] - e1[k]
if diff1 > Hodiffmax:
Hodiffmax=diff1
if diff1 < Hodiffmin:
Hodiffmin=diff1
```

The problem is i get an "index out of bound" error. How can i iterate through an arraylist with [k+1]? I tried a bunch of things now but i dont get smarter. I appreciate any help!

EDIT (that works neither):

```
for k in e1:
for w in k:
diff1= e1[w+1] - e1[w]
if diff1 > Hodiffmax:
Hodiffmax=diff1
if diff1 < Hodiffmin:
Hodiffmin=diff1
```

Error: for w in k - TypeError: 'numpy.int32' object is not iterable