strto 0.1.5

Type-guided parsing library for converting strings to Python objects

strto

strto is a Python library for parsing strings into Python objects based on types and type annotations.

Installation

From PyPi

pip install strto

From source

pip install git+https://github.com/zigai/strto.git

Examples

>>> from strto import get_parser
>>> parser = get_parser()

>>> parser.parse("5", int)
5
>>> parser.parse("1.5", int | float)
1.5
>>> parser.parse("1,2,3,4,5", list[int])
[1, 2, 3, 4, 5]
>>> parser.parse('{"a":1,"b":2,"c":3}', dict[str, int])
{'a': 1, 'b': 2, 'c': 3}

import datetime
>>> parser.parse("2022.07.19", datetime.date)
datetime.date(2022, 7, 19)

>>> parser.parse("0:5:1", range)
range(0, 5, 1)

>>> import enum
>>> class Color(enum.Enum):
...     RED = 1
...     GREEN = 2
...     BLUE = 3
>>> parser.parse("RED", Color)
Color.RED

Add custom parser

from dataclasses import dataclass
from strto import ParserBase, get_parser

@dataclass
class NetworkAddress:
    host: str
    port: int

class NetworkAddressParser(ParserBase):
    def parse(self, value: str) -> NetworkAddress:
        host, port = value.rsplit(":")
        return NetworkAddress(host=host, port=int(port))

parser = get_parser()
parser.add(NetworkAddress, NetworkAddressParser())
result = parser.parse("example.com:8080", NetworkAddress)
print(result)  # NetworkAddress(host='example.com', port=8080)

# You can also use a function
def parse_network_address(value: str) -> NetworkAddress:
    host, port = value.rsplit(":")
    return NetworkAddress(host=host, port=int(port))

parser = get_parser()
parser.add(NetworkAddress, parse_network_address)
result = parser.parse("example.com:8080", NetworkAddress)
print(result)  # NetworkAddress(host='example.com', port=8080)

License

MIT License