initial import of the packaging package in the standard library
diff --git a/Lib/packaging/errors.py b/Lib/packaging/errors.py
new file mode 100644
index 0000000..8924a2d
--- /dev/null
+++ b/Lib/packaging/errors.py
@@ -0,0 +1,142 @@
+"""Exceptions used throughout the package.
+
+Submodules of packaging may raise exceptions defined in this module as
+well as standard exceptions; in particular, SystemExit is usually raised
+for errors that are obviously the end-user's fault (e.g. bad
+command-line arguments).
+"""
+
+
+class PackagingError(Exception):
+ """The root of all Packaging evil."""
+
+
+class PackagingModuleError(PackagingError):
+ """Unable to load an expected module, or to find an expected class
+ within some module (in particular, command modules and classes)."""
+
+
+class PackagingClassError(PackagingError):
+ """Some command class (or possibly distribution class, if anyone
+ feels a need to subclass Distribution) is found not to be holding
+ up its end of the bargain, ie. implementing some part of the
+ "command "interface."""
+
+
+class PackagingGetoptError(PackagingError):
+ """The option table provided to 'fancy_getopt()' is bogus."""
+
+
+class PackagingArgError(PackagingError):
+ """Raised by fancy_getopt in response to getopt.error -- ie. an
+ error in the command line usage."""
+
+
+class PackagingFileError(PackagingError):
+ """Any problems in the filesystem: expected file not found, etc.
+ Typically this is for problems that we detect before IOError or
+ OSError could be raised."""
+
+
+class PackagingOptionError(PackagingError):
+ """Syntactic/semantic errors in command options, such as use of
+ mutually conflicting options, or inconsistent options,
+ badly-spelled values, etc. No distinction is made between option
+ values originating in the setup script, the command line, config
+ files, or what-have-you -- but if we *know* something originated in
+ the setup script, we'll raise PackagingSetupError instead."""
+
+
+class PackagingSetupError(PackagingError):
+ """For errors that can be definitely blamed on the setup script,
+ such as invalid keyword arguments to 'setup()'."""
+
+
+class PackagingPlatformError(PackagingError):
+ """We don't know how to do something on the current platform (but
+ we do know how to do it on some platform) -- eg. trying to compile
+ C files on a platform not supported by a CCompiler subclass."""
+
+
+class PackagingExecError(PackagingError):
+ """Any problems executing an external program (such as the C
+ compiler, when compiling C files)."""
+
+
+class PackagingInternalError(PackagingError):
+ """Internal inconsistencies or impossibilities (obviously, this
+ should never be seen if the code is working!)."""
+
+
+class PackagingTemplateError(PackagingError):
+ """Syntax error in a file list template."""
+
+
+class PackagingByteCompileError(PackagingError):
+ """Byte compile error."""
+
+
+class PackagingPyPIError(PackagingError):
+ """Any problem occuring during using the indexes."""
+
+
+# Exception classes used by the CCompiler implementation classes
+class CCompilerError(Exception):
+ """Some compile/link operation failed."""
+
+
+class PreprocessError(CCompilerError):
+ """Failure to preprocess one or more C/C++ files."""
+
+
+class CompileError(CCompilerError):
+ """Failure to compile one or more C/C++ source files."""
+
+
+class LibError(CCompilerError):
+ """Failure to create a static library from one or more C/C++ object
+ files."""
+
+
+class LinkError(CCompilerError):
+ """Failure to link one or more C/C++ object files into an executable
+ or shared library file."""
+
+
+class UnknownFileError(CCompilerError):
+ """Attempt to process an unknown file type."""
+
+
+class MetadataMissingError(PackagingError):
+ """A required metadata is missing"""
+
+
+class MetadataConflictError(PackagingError):
+ """Attempt to read or write metadata fields that are conflictual."""
+
+
+class MetadataUnrecognizedVersionError(PackagingError):
+ """Unknown metadata version number."""
+
+
+class IrrationalVersionError(Exception):
+ """This is an irrational version."""
+ pass
+
+
+class HugeMajorVersionNumError(IrrationalVersionError):
+ """An irrational version because the major version number is huge
+ (often because a year or date was used).
+
+ See `error_on_huge_major_num` option in `NormalizedVersion` for details.
+ This guard can be disabled by setting that option False.
+ """
+ pass
+
+
+class InstallationException(Exception):
+ """Base exception for installation scripts"""
+
+
+class InstallationConflict(InstallationException):
+ """Raised when a conflict is detected"""