Converting a dataframe to dictionary with multiple values

Question

I have a dataframe like

Sr.No   ID       A         B          C         D
 1     Tom     Earth    English      BMW
 2     Tom     Mars     Spanish      BMW               


        

Answer 1

Grouping by 'ID' and apply to_dict to each group with orient='list' comes pretty close:

df.groupby('ID').apply(lambda dfg: dfg.to_dict(orient='list')).to_dict()
Out[25]: 
{'John': {'A': ['Venus', nan],
  'B': ['Portugese', 'German'],
  'C': ['Mercedes', 'Audi'],
  'D': ['Blue', 'Red'],
  'ID': ['John', 'John'],
  'Sr.No': [4, 5]},
 'Michael': {'A': ['Mercury'],
  'B': ['Hindi'],
  'C': ['Audi'],
  'D': ['Yellow'],
  'ID': ['Michael'],
  'Sr.No': [3]},
 'Tom': {'A': ['Earth', 'Mars'],
  'B': ['English', 'Spanish'],
  'C': ['BMW', 'BMW'],
  'D': [nan, 'Green'],
  'ID': ['Tom', 'Tom'],
  'Sr.No': [1, 2]}}

It should just be a matter of formatting the result slightly.

Edit: to remove 'ID' from the dictionaries:

df.groupby('ID').apply(lambda dfg: dfg.drop('ID', axis=1).to_dict(orient='list')).to_dict()
Out[5]: 
{'John': {'A': ['Venus', nan],
  'B': ['Portugese', 'German'],
  'C': ['Mercedes', 'Audi'],
  'D': ['Blue', 'Red'],
  'Sr.No': [4, 5]},
 'Michael': {'A': ['Mercury'],
  'B': ['Hindi'],
  'C': ['Audi'],
  'D': ['Yellow'],
  'Sr.No': [3]},
 'Tom': {'A': ['Earth', 'Mars'],
  'B': ['English', 'Spanish'],
  'C': ['BMW', 'BMW'],
  'D': [nan, 'Green'],
  'Sr.No': [1, 2]}}