PydanticIO

PydanticIO (pronounce pidantisio) is a tiny file IO utility library for Python powered by Pydantic. This library is a port of the Rust library SerdeIO

Install

# standard distribution
pip install pydanticio

# with YAML backend
pip install pydanticio[yaml]

Supported Formats

• CSV by stdlib csv module
• JSON by stdlib json module
• JSON Lines by stdlib json module
• YAML by pyyaml library, it is an optional feature and you need enable it manually at when you install it.

Usage

• read_record_from_reader is used to read a type T which is a subclass of pydantic.BaseModel from TextIO. Data format must be specified by DataFormat literals.
• read_records_from_reader always tries to deserialize the data as list[T].
• read_record_from_file and read_records_from_file accepts a Path. Data format is automatically determined by file extension.
• write_* functions follow the same rules as read_*.

Note that some data format like CSV and JSON Lines support only reading records list[T].

Examples

from pydantic import BaseModel
from pydanticio import read_records_from_file, write_records_to_file

class User(BaseModel):
    name: str
    age: int


users = read_records_from_file("users.csv", User)
write_records_to_file("users.json", users)