Method __eq__

src/_pytest/python_api.py:419–458

Return whether the given value is equal to the expected value within the pre-specified tolerance.

(self, actual)

        return f"{self.expected} ± {vetted_tolerance}"

    def __eq__(self, actual) -> bool:
        """Return whether the given value is equal to the expected value
        within the pre-specified tolerance."""
        asarray = _as_numpy_array(actual)
        if asarray is not None:
            # Call ``__eq__()`` manually to prevent infinite-recursion with
            # numpy<1.13.  See #3748.
            return all(self.__eq__(a) for a in asarray.flat)

        # Short-circuit exact equality.
        if actual == self.expected:
            return True

        # If either type is non-numeric, fall back to strict equality.
        # NB: we need Complex, rather than just Number, to ensure that __abs__,
        # __sub__, and __float__ are defined.
        if not (
            isinstance(self.expected, (Complex, Decimal))
            and isinstance(actual, (Complex, Decimal))
        ):
            return False

        # Allow the user to control whether NaNs are considered equal to each
        # other or not.  The abs() calls are for compatibility with complex
        # numbers.
        if math.isnan(abs(self.expected)):  # type: ignore[arg-type]
            return self.nan_ok and math.isnan(abs(actual))  # type: ignore[arg-type]

        # Infinity shouldn't be approximately equal to anything but itself, but
        # if there's a relative tolerance, it will be infinite and infinity
        # will seem approximately equal to everything.  The equal-to-itself
        # case would have been short circuited above, so here we can just
        # return false if the expected value is infinite.  The abs() call is
        # for compatibility with complex numbers.
        if math.isinf(abs(self.expected)):  # type: ignore[arg-type]
            return False

        # Return true if the two numbers are within the tolerance.
        result: bool = abs(self.expected - actual) <= self.tolerance
        return result

    # Ignore type because of https://github.com/python/mypy/issues/4266.
    __hash__ = None  # type: ignore