R, Python 분석과 프로그래밍의 친구 (by R Friend)

{

    "1.FirstName": "Gildong",
    "2.LastName": "Hong",
    "3.Age": 20,
    "4.University": "Yonsei University",
    "5.Courses": [
        {
            "Classes": [
                "Probability",
                "Generalized Linear Model",
                "Categorical Data Analysis"
            ],
            "Major": "Statistics"
        },
        {
            "Classes": [
                "Data Structure",
                "Programming",
                "Algorithms"
            ],
            "Minor": "ComputerScience"
        }
    ]
}

 (1) Python 객체를 JSON 데이터로 쓰기, 직렬화, 인코딩: json.dumps()
      (Write Python object to JSON, Serialization, Encoding)

 import json

student_data = {
    "1.FirstName": "Gildong",
    "2.LastName": "Hong",
    "3.Age": 20, 
    "4.University": "Yonsei University",
    "5.Courses": [
        {
            "Major": "Statistics", 
            "Classes": ["Probability", 
                        "Generalized Linear Model", 
                        "Categorical Data Analysis"]
        }, 
        {
            "Minor": "ComputerScience", 
            "Classes": ["Data Structure", 
                        "Programming", 
                        "Algorithms"]
        }
    ]
} 

import json

with open("student_file.json", "w") as json_file:

    json.dump(student_data, json_file)

import json

st_json = json.dumps(student_data)

print(st_json)

{"5.Courses": [{"Classes": ["Probability", "Generalized Linear Model", "Categorical Data Analysis"], "Major": "Statistics"}, {"Minor": "ComputerScience", "Classes": ["Data Structure", "Programming", "Algorithms"]}], "3.Age": 20, "2.LastName": "Hong", "4.University": "Yonsei University", "1.FirstName": "Gildong"}

# use json.dumps() instead of json.dump()

st_json = json.dump(student_data)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-ac881d00bbcb> in <module>()
----> 1 st_json = json.dump(student_data)

TypeError: dump() missing 1 required positional argument: 'fp'

import json

st_json2 = json.dumps(student_data, indent=4)

print(st_json2)

{

    "3.Age": 20,
    "5.Courses": [
        {
            "Classes": [
                "Probability",
                "Generalized Linear Model",
                "Categorical Data Analysis"
            ],
            "Major": "Statistics"
        },
        {
            "Minor": "ComputerScience",
            "Classes": [
                "Data Structure",
                "Programming",
                "Algorithms"
            ]
        }
    ],
    "1.FirstName": "Gildong",
    "4.University": "Yonsei University",
    "2.LastName": "Hong"
}

import json

st_json3 = json.dumps(student_data, indent=4, sort_keys=True)

print(st_json3)

{
    "1.FirstName": "Gildong",
    "2.LastName": "Hong",
    "3.Age": 20,
    "4.University": "Yonsei University",
    "5.Courses": [
        {
            "Classes": [
                "Probability",
                "Generalized Linear Model",
                "Categorical Data Analysis"
            ],
            "Major": "Statistics"
        },
        {
            "Classes": [
                "Data Structure",
                "Programming",
                "Algorithms"
            ],
            "Minor": "ComputerScience"
        }
    ]
}

 (2) JSON 포맷 데이터를 Python 객체로 읽기, 역직렬화, 디코딩: json.loads()
      (Read JSON to Python, Deserialization, Decoding)

import json

with open("student_file.json", "r") as st_json:

    st_python = json.load(st_json)

st_python

{'1.FirstName': 'Gildong',
 '2.LastName': 'Hong',
 '3.Age': 20,
 '4.University': 'Yonsei University',
 '5.Courses': [{'Classes': ['Probability',
    'Generalized Linear Model',
    'Categorical Data Analysis'],
   'Major': 'Statistics'},
  {'Classes': ['Data Structure', 'Programming', 'Algorithms'],
   'Minor': 'ComputerScience'}]}

# use json.load() instead of json.loads()

with open("student_json_file.json", "r") as st_json:

    st_python = json.loads(st_json)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-53-c39634419df6> in <module>()
      1 with open("student_json_file.json", "r") as st_json:
----> 2     st_python = json.loads(st_json)

C:\Users\admin\Anaconda3\lib\json\__init__.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    310     if not isinstance(s, str):
    311         raise TypeError('the JSON object must be str, not {!r}'.format(
--> 312                             s.__class__.__name__))
    313     if s.startswith(u'\ufeff'):
    314         raise JSONDecodeError("Unexpected UTF-8 BOM (decode using utf-8-sig)",

TypeError: the JSON object must be str, not 'TextIOWrapper'

import json

st_python2 = json.loads(st_json3)

st_python2

{'1.FirstName': 'Gildong',
 '2.LastName': 'Hong',
 '3.Age': 20,
 '4.University': 'Yonsei University',
 '5.Courses': [{'Classes': ['Probability',
    'Generalized Linear Model',
    'Categorical Data Analysis'],
   'Major': 'Statistics'},
  {'Classes': ['Data Structure', 'Programming', 'Algorithms'],
   'Minor': 'ComputerScience'}]}

# use json.loads() instead of json.load()

st_python2 = json.load(st_json3)

---------------------------------------------------------------------------

AttributeError                            Traceback (most recent call last)
<ipython-input-54-9de49903fef6> in <module>()
----> 1 st_python2 = json.load(st_json3)

C:\Users\admin\Anaconda3\lib\json\__init__.py in load(fp, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    263 
    264     """
--> 265     return loads(fp.read(),
    266         cls=cls, object_hook=object_hook,
    267         parse_float=parse_float, parse_int=parse_int,

AttributeError: 'str' object has no attribute 'read'