# Work with list of lists of tuples

I have this list:

```dCF3v=[[(1.90689635276794, -44704.76171875)],
[(1.90689635276794, -44705.76171875)],
[(1.90689635276794, -44706.76171875)],
[(1.90689635276794, -44707.76171875)]
]
```

I'd like to compare the second element of each tuple and find the absolute maximum:

```-44707.76171875
```

My code looks like:

```CF3=0
for x in dCF3v:
if abs(x[1])>abs(CF3):
CF3=x[1]
```

You have a list which holds lists which hold a tuple. So, you probably want abs(x[0][1]). Then you command can simply be:

```max(abs(x[0][1]) for x in dCF3v)
```

More to the point, you probably actually want to change the data structure to a list holding tuples:

```dCF3v = [x[0] for x in dCF3v]
```

which then would look like:

```max(abs(x[0]) for x in dCF3v)
```

Or, if you wanted the entire tuple to be returned instead of just the second element:

```max(dCF3v,key=lambda x:abs(x[0]))
```

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