{"library":"pyvalid","title":"pyvalid","description":"pyvalid is a Python data validation tool that allows for easy validation of function's input parameters and return values using `accepts` and `returns` decorators. The current version is 1.0.4, released in October 2020, suggesting a low release cadence.","language":"python","status":"active","last_verified":"Sun May 17","install":{"commands":["pip install pyvalid"],"cli":null},"imports":["from pyvalid import accepts, returns","from pyvalid import accepts, returns"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"from pyvalid import accepts, returns, InvalidArgumentNumberError, ArgumentValidationError, InvalidReturnType\n\n@returns(int, float)\n@accepts(str, (int, 2.0), (int, float))\ndef calc(operator, val1, val2, val3):\n    # WARNING: Using eval() with untrusted input is a security risk.\n    # This is for demonstration purposes based on the official example.\n    expression = '{v1} {op} {v2} {op} {v3}'.format(\n        op=operator, v1=val1, v2=val2, v3=val3\n    )\n    return eval(expression)\n\ntry:\n    # Returns int value: 24\n    print(calc('*', 2, 3, 4))\n\n    # Returns float value: 24.0\n    print(calc(operator='*', val1=2, val2=3.0, val3=4))\n\n    # This will raise an ArgumentValidationError because 'val1' should be int or 2.0, not a string\n    # print(calc('+', 1, 'invalid', 3))\n\n    # Example of a call that would fail if uncommented and demonstrate exception handling\n    # calc('+', 1, 'invalid_type', 3)\n\n    # Example that would fail if return type is wrong\n    # @returns(str)\n    # def bad_return():\n    #    return 123\n    # bad_return()\n\nexcept (InvalidArgumentNumberError, ArgumentValidationError, InvalidReturnType) as e:\n    print(f\"Validation Error: {e}\")\nexcept Exception as e:\n    print(f\"An unexpected error occurred: {e}\")","lang":"python","description":"This example demonstrates how to use the `@accepts` and `@returns` decorators to validate function arguments and return values. 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