def get_git_changeset(filename=None):
dirname = os.path.dirname(filename or __file__)<EOL>git_show = sh('<STR_LIT>',<EOL>cwd=dirname)<EOL>timestamp = git_show.partition('<STR_LIT:\n>')[<NUM_LIT:0>]<EOL>try:<EOL><INDENT>timestamp = datetime.datetime.utcfromtimestamp(int(timestamp))<EOL><DEDENT>except ValueError:<EOL><INDENT>return None<EOL><DEDENT>return timestamp.strftime('<STR_LIT>')<EOL>
Returns a numeric identifier of the latest git changeset.

    The result is the UTC timestamp of the changeset in YYYYMMDDHHMMSS format.
    This value isn't guaranteed to be unique, but collisions are very unlikely,
    so it's sufficient for generating the development version numbers.