Python library for contracts testing

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  • License: Apache Software License (Apache-2.0)
  • Author: yassu
  • Tags contract , test
  • Requires: Python >=3.7, <4.0
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Project description

ycontract

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Python library for contracts testing.

This library provides functions for checking argument(in_contract) and return value(out_contract) of a function.

How to install

$ pip install ycontract

Example

Example files are here(test file)

Main example is

from ycontract import contract, out_contract

@contract(lambda a, b: a * b > 0)
def add(a, b, c):
    return a + b


@contract(returns=lambda res: res > 0)
def sub(a, b):
    return a - b

And more complex example about in_contract is

@contract(
    lambda a0: a0 > 0,
    lambda a1, b: a1 > 0 and b > 0,
    {
        "a2": lambda x: x > 0,
        "a3": [
            lambda x: x >= 0,
            lambda x: x < 4,
        ],
        ("a4", "a5"): lambda x, y: x > 0 and y > 0,
    },
    b=lambda x: x > 0,
    contract_tag="tagtag",
)
def add_for_complex(a0, a1, a2, a3, a4, a5, b=1):
    return a0 + a1 + a2 + a3 + a4 + a5 + b

Furthermore if you want to be disable, call

ycontract.disable_contract()

LICENSES

Apache 2.0

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