Create Python graphviz Digraph with Pandas

I am trying to make a diagram tree in graphviz.Digraph, I am using Pandas dataframe. By the below query, I am getting the processid’s and their dependents id’s in a form of a dictionary

dependent = df.groupby('dependent_processid')['Processid'].apply(list).to_dict()
print(dependent)

#output:
{6720: [6721], 6721: [6722, 6724, 6725], 6725: [6723, 6726], 6753: [7177]}

But I want the data in below format:

          6720-> {6721}
          6721-> {6722, 6724, 6725}
          6725-> {6723, 6726}
....and so on...

Can someone please help me return pandas dataframe output in such format?

Answer

Are you wanting this:

def demo(k,v): 
    return f'{k} -> {v}'

dependent = df.groupby('dependent_processid')['Processid'].apply(set).to_dict()  
for k, v in dependent.items():
    print(demo(k,v))

Output:

6720-> {6721}
6721-> {6722, 6724, 6725}
6725-> {6723, 6726}
...