YouTipPython3 Json
# Python3.x Python3 JSON Data Parsing
JSON (JavaScript Object Notation) is a lightweight data interchange format.
If you are not familiar with JSON, you can first read our (#).
In Python3, the `json` module can be used to encode and decode JSON data. It contains two functions:
* **json.dumps():** Encodes data.
* **json.loads():** Decodes data.
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During the JSON encoding and decoding process, Python's native types and JSON types are converted to each other. The specific conversion mapping is as follows:
### Python Encoding to JSON Type Conversion Table:
| Python | JSON |
| --- | --- |
| dict | object |
| list, tuple | array |
| str | string |
| int, float, int- & float-derived Enums | number |
| True | true |
| False | false |
| None | null |
### JSON Decoding to Python Type Conversion Table:
| JSON | Python |
| --- | --- |
| object | dict |
| array | list |
| string | str |
| number (int) | int |
| number (real) | float |
| true | True |
| false | False |
| null | None |
### json.dumps and json.loads Examples
The following examples demonstrate converting Python data structures to JSON:
## Example (Python 3.0+)
#!/usr/bin/python3 import json# Python dictionary type converted to JSON object data = { 'no' : 1, 'name' : 'Tutorial', 'url' : '' } json_str = json.dumps(data)print("Python original data:", repr(data))print("JSON object:", json_str)
Executing the above code produces the following output:
Python original data: {'no': 1, 'name': 'Tutorial', 'url': ''} JSON object: {"no": 1, "name": "Tutorial", "url": ""}
From the output, it can be seen that simple types after encoding are very similar to their original `repr()` output.
Continuing from the previous example, we can convert a JSON-encoded string back into a Python data structure:
## Example (Python 3.0+)
#!/usr/bin/python3 import json# Python dictionary type converted to JSON object data1 = { 'no' : 1, 'name' : 'Tutorial', 'url' : '' } json_str = json.dumps(data1)print("Python original data:", repr(data1))print("JSON object:", json_str)# Convert JSON object to Python dictionary data2 = json.loads(json_str)print("data2['name']: ", data2['name'])print("data2['url']: ", data2['url'])
Executing the above code produces the following output:
Python original data: {'name': 'Tutorial', 'no': 1, 'url': ''} JSON object: {"name": "Tutorial", "no": 1, "url": ""} data2['name']: Tutorial data2['url']:
If you are dealing with files instead of strings, you can use **json.dump()** and **json.load()** to encode and decode JSON data. For example:
## Example (Python 3.0+)
# Write JSON data with open('data.json', 'w') as f: json.dump(data,