The core method of converting dictionary to JSON in Python is to use the built-in json module. The specific steps are as follows: 1. Use json.dumps() to convert the dictionary to JSON string, supporting common data types; 2. If you include Chinese, you need to add ensure_ascii=False parameter to preserve characters; 3. Complex types such as dates or custom objects need to be converted first or processed with default parameters; 4. When writing to a file, json.dump() should be used and the format can be beautified through indent parameters.
Using Python to convert dictionary to JSON is actually very simple, the core is to use the built-in json module. As long as you master a few key points, you will basically not make any mistakes.
Using json.dumps() is the most direct way
In Python, convert dict to JSON strings, the most commonly used one is json.dumps() . This function will automatically process most data types, such as strings, numbers, lists, nested dictionaries, etc.
For example:
import json
data = {
"name": "Alice",
"age": 30,
"is_student": False,
"hobbies": ["reading", "gaming"]
}
json_str = json.dumps(data)
print(json_str)The output is a standard JSON format string:
{"name": "Alice", "age": 30, "is_student": false, "hobbies": ["reading", "gaming"]} Note: Boolean values ??will be converted to lowercase true / false , which is the specification of JSON.
Be careful when dealing with Chinese or special characters
By default, json.dumps() escapes non-ASCII characters into Unicode encoding. If you want to keep Chinese, you need to add the parameter ensure_ascii=False .
for example:
data = {"message": "Hello, world"}
json_str = json.dumps(data, ensure_ascii=False)
print(json_str)This output is:
{"message": "Hello, world"} Otherwise you will see encodings like \u4f60\u597d .
In addition, if the dictionary contains complex types such as date, collection, custom objects, etc., json.dumps() will report an error. At this time, either convert these values ??first or use default parameter to customize the serialization logic.
Use json.dump() when writing files
If you don't want to generate a string, but want to write it directly into a JSON file, you can use json.dump() .
Example:
with open("data.json", "w", encoding="utf-8") as f:
json.dump(data, f, ensure_ascii=False, indent=2) indent=2 is added here to make the output JSON more beautiful and easy to read. If not added, it will be displayed in one line.
Basically that's it. Mainly remember: use json.dumps() to convert strings, add ensure_ascii=False in Chinese, and use json.dump() to write files. You have to deal with complex types yourself.
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