creating a dictionary

[nilamo]

...?  Building dicts isn't hard.  And if your keys are all sequentially numerical, you can also use a list.

# dict
graph = {
   1: [2],
   2: [3, 4],
   3: [1],
   4: [4, 5]
}

# list
other_graph = [
   [], # 0
   [2], # 1
   [3, 4],
   [1],
   [4, 5]
]

print(graph)
print(other_graph)