temparse 0.0.4

temparse is template + parse

temparse

temparse = template + parse, parse strings using t-string templates.

Inspired by parse, but built on Python 3.14's t-strings, with better type hints.

Installation

uv

uv add temparse

pip

# Requires Python >= 3.14.
pip install temparse

Quick Start

from temparse import parse

city, year = parse[str, int](
    t"I live in {str}, since {int}", "I live in Tokyo, since 2010"
)
assert city == "Tokyo"
assert year == 2010

The return type is tuple[str, int].

Supported Types

Interpolation	Example	Output
{str}	"hello"	"hello"
{int}	"42"	42
{int}	"0xff"	255
{int:16}	"ff"	255
{float}	"3.14"	3.14
{complex}	"-1.23+4.5j"	-1.23+4.5j
{list}	'[1,2,3]'	[1, 2, 3]
{dict}	'{"a":1}'	{"a": 1}
{json}	'{"a":1}'	{"a": 1}
{datetime.datetime:%d/%m/%y %H:%M:%S}	"31/01/22 23:59:59"	datetime
{datetime.date:%Y-%m-%d}	"2024-03-15"	date
{datetime.time:%H:%M:%S}	"13:23:27"	time

[!IMPORTANT] list and dict are just aliases for json.

Custom Conversions

Decorate a function with @Conversion to use it directly in a template:

from temparse import Conversion, parse


@Conversion
def percent(s: str) -> float:
    return float(s.rstrip("%")) / 100


(result,) = parse[float](t"x = {percent}", "x = 30%")
assert result == 0.3

When your converter needs the format spec as well, use FormatConversion:

from temparse import FormatConversion, parse


@FormatConversion
def between(s: str, spec: str) -> str:
    lo, hi = spec.split(",")
    return s[int(lo) : int(hi)]


(result,) = parse[str](t"{between:2,5}", "abcdefg")
assert result == "cde"

Parser (Compiled Templates)

Build a parser once and reuse it:

from temparse import Parser

parser = Parser[str, int, float](t"{str} + {int} = {float}")

assert parser.parse("foo + 3 = 3.14") == ("foo", 3, 3.14)
assert parser.parse("bar + 7 = 2.72") == ("bar", 7, 2.72)

License

MIT