gistfile1.py

# A dictionary comprehension:
a = {num: Node(num) for num in range(1, 8)}

```
a now looks like: 
{1: Node(data=1, next_node=None),
 2: Node(data=2, next_node=None),
 3: Node(data=3, next_node=None),
 4: Node(data=4, next_node=None),
 5: Node(data=5, next_node=None),
 6: Node(data=6, next_node=None),
 7: Node(data=7, next_node=None)}
```

build a linked list:

x = a[5]
x.next = a[3]
x.next.next = a[1]
etc...

gistfile2.txt

# A dictionary comprehension:
a = {num: Node(num) for num in range(1, 8)}

```
a now looks like: 
{1: Node(data=1, next_node=None),
 2: Node(data=2, next_node=None),
 3: Node(data=3, next_node=None),
 4: Node(data=4, next_node=None),
 5: Node(data=5, next_node=None),
 6: Node(data=6, next_node=None),
 7: Node(data=7, next_node=None)}
```

build a linked list:

x = a[5]
x.next = a[3]
x.next.next = a[1]
etc...