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Description:

rtoml 0.11.0

rtoml

A better TOML library for python implemented in rust.
Why Use rtoml

Correctness: rtoml is based on the widely used and very stable toml-rs
library, it passes all the standard TOML tests as well as having 100%
coverage on python code. Other TOML libraries for python I tried all failed to parse some valid TOML.
Performance: see github.com/pwwang/toml-bench -
rtoml is the fastest Python TOML libraries at the time of writing.
None-value handling: rtoml has flexible support for None values, instead of simply ignoring them.

Install
Requires python>=3.7, binaries are available from pypi for Linux, macOS and Windows,
see here.
pip install rtoml

If no binary is available on pypi for you system configuration; you'll need rust stable
installed before you can install rtoml.
Usage
load
def load(toml: Union[str, Path, TextIO], *, none_value: Optional[str] = None) -> Dict[str, Any]: ...

Parse TOML via a string or file and return a python dictionary.

toml: a str, Path or file object from open().
none_value: controlling which value in toml is loaded as None in python. By default, none_value is None, which means nothing is loaded as None

loads
def loads(toml: str, *, none_value: Optional[str] = None) -> Dict[str, Any]: ...

Parse a TOML string and return a python dictionary. (provided to match the interface of json and similar libraries)

toml: a str containing TOML.
none_value: controlling which value in toml is loaded as None in python. By default, none_value is None, which means nothing is loaded as None

dumps
def dumps(obj: Any, *, pretty: bool = False, none_value: Optional[str] = "null") -> str: ...

Serialize a python object to TOML.

obj: a python object to be serialized.
pretty: if True the output has a more "pretty" format.
none_value: controlling how None values in obj are serialized. none_value=None means None values are ignored.

dump
def dump(
obj: Any, file: Union[Path, TextIO], *, pretty: bool = False, none_value: Optional[str] = "null"
) -> int: ...

Serialize a python object to TOML and write it to a file.

obj: a python object to be serialized.
file: a Path or file object from open().
pretty: if True the output has a more "pretty" format.
none_value: controlling how None values in obj are serialized. none_value=None means None values are ignored.

Examples
from datetime import datetime, timezone, timedelta
import rtoml

obj = {
'title': 'TOML Example',
'owner': {
'dob': datetime(1979, 5, 27, 7, 32, tzinfo=timezone(timedelta(hours=-8))),
'name': 'Tom Preston-Werner',
},
'database': {
'connection_max': 5000,
'enabled': True,
'ports': [8001, 8001, 8002],
'server': '192.168.1.1',
},
}

loaded_obj = rtoml.load("""\
# This is a TOML document.

title = "TOML Example"

[owner]
name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00-08:00 # First class dates

[database]
server = "192.168.1.1"
ports = [8001, 8001, 8002]
connection_max = 5000
enabled = true
""")

assert loaded_obj == obj

assert rtoml.dumps(obj) == """\
title = "TOML Example"

[owner]
dob = 1979-05-27T07:32:00-08:00
name = "Tom Preston-Werner"

[database]
connection_max = 5000
enabled = true
server = "192.168.1.1"
ports = [8001, 8001, 8002]
"""

An example of None-value handling:
obj = {
'a': None,
'b': 1,
'c': [1, 2, None, 3],
}

# Ignore None values
assert rtoml.dumps(obj, none_value=None) == """\
b = 1
c = [1, 2, 3]
"""

# Serialize None values as '@None'
assert rtoml.dumps(obj, none_value='@None') == """\
a = "@None"
b = 1
c = [1, 2, "@None", 3]
"""

# Deserialize '@None' back to None
assert rtoml.load("""\
a = "@None"
b = 1
c = [1, 2, "@None", 3]
""", none_value='@None') == obj