# Source code for scrapy.exceptions

    """
    Scrapy core exceptions

    These exceptions are documented in docs/topics/exceptions.rst. Please don't add
    new exceptions here without documenting them there.
    """

    from typing import Any

    # Internal

    class NotConfigured(Exception):
        """Indicates a missing configuration situation"""

        pass

    class _InvalidOutput(TypeError):
        """
        Indicates an invalid value has been returned by a middleware's processing method.
        Internal and undocumented, it should not be raised or caught by user code.
        """

        pass

    # HTTP and crawling

    class IgnoreRequest(Exception):
        """Indicates a decision was made not to process a request"""

    class DontCloseSpider(Exception):
        """Request the spider not to be closed yet"""

        pass

    class CloseSpider(Exception):
        """Raise this from callbacks to request the spider to be closed"""

        def __init__(self, reason: str = "cancelled"):
            super().__init__()
            self.reason = reason

    class StopDownload(Exception):
        """
        Stop the download of the body for a given response.
        The 'fail' boolean parameter indicates whether or not the resulting partial response
        should be handled by the request errback. Note that 'fail' is a keyword-only argument.
        """

        def __init__(self, *, fail: bool = True):
            super().__init__()
            self.fail = fail

    # Items

    class DropItem(Exception):
        """Drop item from the item pipeline"""

        pass

    class NotSupported(Exception):
        """Indicates a feature or method is not supported"""

        pass

    # Commands

    class UsageError(Exception):
        """To indicate a command-line usage error"""

        def __init__(self, *a: Any, **kw: Any):
            self.print_help = kw.pop("print_help", True)
            super().__init__(*a, **kw)

    class ScrapyDeprecationWarning(Warning):
        """Warning category for deprecated features, since the default
        DeprecationWarning is silenced on Python 2.7+
        """

        pass

    class ContractFail(AssertionError):
        """Error raised in case of a failing contract"""

        pass