gitpython-developers
diff --git a/‎lib/git/errors.py
+25-3 b/‎lib/git/errors.py
+25-3
@@ -3,16 +3,16 @@
 #
 # This module is part of GitPython and is released under
 # the BSD License: http://www.opensource.org/licenses/bsd-license.php
-"""
-Module containing all exceptions thrown througout the git package,
-"""
+""" Module containing all exceptions thrown througout the git package, """
 
 class InvalidGitRepositoryError(Exception):
     """ Thrown if the given repository appears to have an invalid format.  """
 
+
 class NoSuchPathError(OSError):
     """ Thrown if a path could not be access by the system. """
 
+
 class GitCommandError(Exception):
     """ Thrown if execution of the git command fails with non-zero status code. """
     def __init__(self, command, status, stderr=None):
@@ -24,3 +24,25 @@ def __str__(self):
         return ("'%s' returned exit status %i: %s" %
                     (' '.join(str(i) for i in self.command), self.status, self.stderr))
 
+
+class CheckoutError( Exception ):
+    """Thrown if a file could not be checked out from the index as it contained
+    changes.
+
+    The .failed_files attribute contains a list of relative paths that failed
+    to be checked out as they contained changes that did not exist in the index.
+
+    The .failed_reasons attribute contains a string informing about the actual
+    cause of the issue.
+
+    The .valid_files attribute contains a list of relative paths to files that
+    were checked out successfully and hence match the version stored in the
+    index"""
+    def __init__(self, message, failed_files, valid_files, failed_reasons):
+        Exception.__init__(self, message)
+        self.failed_files = failed_files
+        self.failed_reasons = failed_reasons
+        self.valid_files = valid_files
+
+    def __str__(self):
+        return Exception.__str__(self) + ":%s" % self.failed_files