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.� exceptionr c C s t | ||�S )a� Matches if the called function raised the expected exception.
:param exception: The class of the expected exception
:param pattern: Optional regular expression to match exception message.
:param matching: Optional Hamcrest matchers to apply to the exception.
Expects the actual to be wrapped by using :py:func:`~hamcrest.core.core.raises.calling`,
or a callable taking no arguments.
Optional argument pattern should be a string containing a regular expression. If provided,
the string representation of the actual exception - e.g. `str(actual)` - must match pattern.
Examples::
assert_that(calling(int).with_args('q'), raises(TypeError))
assert_that(calling(parse, broken_input), raises(ValueError))
assert_that(
calling(valid_user, bad_json),
raises(HTTPError, matching=has_properties(status_code=500)
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:py:func:`~hamcrest.core.core.raises.raises` matcher can catch any thrown exception.
:param func: The function or method to be called
The arguments can be provided with a call to the `with_args` function on the returned
object::
calling(my_method).with_args(arguments, and_='keywords')
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