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  1. #!/usr/bin/env python3
  2.  
  3. # Family people (c) Baltasar 2019 MIT License <baltasarq@gmail.com>
  4.  
  5.  
  6. import csv
  7. import json
  8. import sys
  9. from io import StringIO
  10.  
  11.  
  12. class Person:
  13.     def __init__(self, name, surname, parent):
  14.         self._name = name
  15.         self._surname = surname
  16.         self._parent = parent
  17.         self._children = People()
  18.  
  19.     @property
  20.     def name(self):
  21.         return self._name
  22.  
  23.     @property
  24.     def surname(self):
  25.         return self._surname
  26.  
  27.     @property
  28.     def parent(self):
  29.         return self._parent
  30.  
  31.     @property
  32.     def children(self):
  33.         return self._children
  34.  
  35.     def __str__(self):
  36.         toret = self.surname + ", " + self.name + " (" + self.parent + ")";
  37.  
  38.         if self.children:
  39.             toret += " (" + str(self.children) + ")"
  40.  
  41.         return toret
  42.  
  43.  
  44. class JsonPeopleEncoder(json.JSONEncoder):
  45.     @staticmethod
  46.     def basic_encode_person(p):
  47.         return {"name": p.name,
  48.                 "surname": p.surname,
  49.                 "kids": len(p.children),
  50.                 "children": []}
  51.  
  52.     @staticmethod
  53.     def encode_people(people):
  54.         toret = []
  55.  
  56.         for p in people:
  57.             p_dict = JsonPeopleEncoder.basic_encode_person(p)
  58.  
  59.             if p.children:
  60.                 p_dict["children"].append(
  61.                     JsonPeopleEncoder.encode_people(p.children))
  62.  
  63.             toret += [p_dict]
  64.  
  65.         return toret
  66.  
  67.     def default(self, obj):
  68.         if isinstance(obj, People):
  69.             return JsonPeopleEncoder.encode_people(obj)
  70.  
  71.         # Let the base class default method raise the TypeError
  72.         return json.JSONEncoder.default(self, obj)
  73.  
  74.  
  75. class People:
  76.     def __init__(self):
  77.         self._persons = []
  78.  
  79.     def add(self, p):
  80.         self._persons.append(p)
  81.  
  82.     def __add__(self, p):
  83.         self._persons.append(p)
  84.         return self
  85.  
  86.     def __true__(self):
  87.         return bool(self._persons)
  88.  
  89.     def __len__(self):
  90.         return len(self._persons)
  91.  
  92.     def __getitem__(self, item):
  93.         return self._persons[item]
  94.  
  95.     def __str__(self):
  96.         return str.join("\n", [str(p) for p in self._persons])
  97.  
  98.     def _put_children_inside_persons(self):
  99.         dict_names = {p.name:p for p in self._persons}
  100.         people_to_remove = []
  101.  
  102.         for p in self._persons:
  103.             if p.parent and p.parent != "null":
  104.                 parent = dict_names.get(p.parent)
  105.  
  106.                 if parent:
  107.                     parent.children.add(p)
  108.                     people_to_remove += [p]
  109.  
  110.         for p in people_to_remove:
  111.             self._persons.remove(p)
  112.  
  113.         return
  114.  
  115.     def as_json(self):
  116.         return json.dumps(self, indent=4, cls=JsonPeopleEncoder)
  117.  
  118.     @staticmethod
  119.     def read(fd):
  120.         toret = People()
  121.  
  122.         reader = csv.DictReader(fd, delimiter=',')
  123.         for row in reader:
  124.             toret += Person(
  125.                         row["name"],
  126.                         row["surname"],
  127.                         row["parent"])
  128.  
  129.         toret._put_children_inside_persons()
  130.         return toret
  131.  
  132.  
  133. if __name__ == "__main__":
  134. 	with StringIO(sys.stdin.read()) as strf:
  135. 		ps = People.read(strf)
  136.  
  137. 	print("People:")
  138. 	print(ps)
  139. 	print("\nJSON:")
  140. 	print(ps.as_json())
  141.  
Success #stdin #stdout 0.02s 10024KB
comments (?)
stdin 
name,surname,parent
diane,xxx,null
bob,xxx,diane
brian,xxx,bob
claire,xxx,brian
tom,xxx,brian
jane,xxx,tom
mike,xxx,tom
stdout 
People:
xxx, diane (null) (xxx, bob (diane) (xxx, brian (bob) (xxx, claire (brian)
xxx, tom (brian) (xxx, jane (tom)
xxx, mike (tom)))))

JSON:
[
    {
        "name": "diane",
        "surname": "xxx",
        "kids": 1,
        "children": [
            [
                {
                    "name": "bob",
                    "surname": "xxx",
                    "kids": 1,
                    "children": [
                        [
                            {
                                "name": "brian",
                                "surname": "xxx",
                                "kids": 2,
                                "children": [
                                    [
                                        {
                                            "name": "claire",
                                            "surname": "xxx",
                                            "kids": 0,
                                            "children": []
                                        },
                                        {
                                            "name": "tom",
                                            "surname": "xxx",
                                            "kids": 2,
                                            "children": [
                                                [
                                                    {
                                                        "name": "jane",
                                                        "surname": "xxx",
                                                        "kids": 0,
                                                        "children": []
                                                    },
                                                    {
                                                        "name": "mike",
                                                        "surname": "xxx",
                                                        "kids": 0,
                                                        "children": []
                                                    }
                                                ]
                                            ]
                                        }
                                    ]
                                ]
                            }
                        ]
                    ]
                }
            ]
        ]
    }
]
https://ideone.com/YiaTn5
Transforming CSV input to a JSON format. In the middle, the data of the persons loaded are structured so children is put inside other persons.
language:
Python 3 nbc (python 3.7.3)
created:
3 years ago
visibility:
public

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