checktestdata 2026.3.14

A python reimplementation of Checktestdata (https://github.com/DOMjudge/checktestdata).

Python Checktestdata

Checktestdata is a tool to verify the syntactical integrity of test cases in programming contests like the ACM ICPC. It allows you to specify a simple grammar for your testdata input files, according to which the testdata is checked.

— Checktestdata

This is a Python 3.10 compatible reimplementation of the checktestdata program.

[!NOTE] As of now, the python implementation on supports strict file validation. The arguments whitespace-ok and generate are not supported.

Grammar specification

The language specification can be found in the domjudge Checktestdata repository.

Installation

Requirements:

• PyPy >= v7.3.15 (preferred)
• CPython >= 3.10 (alternative)

The package can be installed directly from pypi:

pypy3 -m ensurepip
pypy3 -m pip install checktestdata

pip install checktestdata

Use

You can use this program to run .ctd validators in the same way as the checktestdata binary:

pyctd validator.ctd [-d | --debug] < testcase

You can also use the programm to convert .ctd files into standalone python applications:

pyctd validator.ctd --convert [name] [-d | --debug]

[!TIP] The generated validator might not be easy to read, cosider adding -d to include the original code as comments.

Extensions

This checktesdata implementation supports the --constraints_file argument and can be used with BAPCtools to check the constraints of a problem.