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EDITING: exceptions.py

"""Exceptions used throughout package"""

class PipError(Exception):
    """Base pip exception"""

class InstallationError(PipError):
    """General exception during installation"""

class UninstallationError(PipError):
    """General exception during uninstallation"""

class DistributionNotFound(InstallationError):
    """Raised when a distribution cannot be found to satisfy a requirement"""

class BestVersionAlreadyInstalled(PipError):
    """Raised when the most up-to-date version of a package is already
    installed.  """

class BadCommand(PipError):
    """Raised when virtualenv or a command is not found"""

class CommandError(PipError):
    """Raised when there is an error in command-line arguments"""

class PreviousBuildDirError(PipError):
    """Raised when there's a previous conflicting build directory"""

class HashMismatch(InstallationError):
    """Distribution file hash values don't match."""

class InvalidWheelFilename(InstallationError):
    """Invalid wheel filename."""

class UnsupportedWheel(InstallationError):
    """Unsupported wheel."""