class Error(Exception):
    """Base class for exceptions in this module."""
    pass

class FileNotSupportedError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, file_format):
        self.file_format = file_format

class FileTooLargeError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, file_size):
        self.file_size = file_size

class FileSplittedPartiallyError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, file_parts):
        self.file_parts = file_parts


class FileNotConvertedError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        pass

class FileSentPartiallyError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, sent_audio_ids):
        self.sent_audio_ids = sent_audio_ids

class URLError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = ""

class URLDirectError(URLError):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = "direct"

class URLCountryError(URLError):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = "country"

class URLLiveError(URLError):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = "live"

class URLTimeoutError(URLError):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = "timeout"

class Error(Exception):
    """Base class for exceptions in this module."""

class FileNotSupportedError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, file_format):
        self.file_format = file_format

class FileTooLargeError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, file_size):
        self.file_size = file_size

class FileSplittedPartiallyError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, file_parts):
        self.file_parts = file_parts


class FileNotConvertedError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        pass

class FileSentPartiallyError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, sent_audio_ids):
        self.sent_audio_ids = sent_audio_ids

class URLError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = ""

class URLDirectError(URLError):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = "direct"

class URLCountryError(URLError):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = "country"

class URLLiveError(URLError):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = "live"

class URLTimeoutError(URLError):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self):
        self.status = "timeout"

Remove unnecessary `pass`